Chemical warfare

Using poison gas or other toxins in war

Part of a series on

Chemical agents
Lethal agents

Blood

* Cyanogen chloride (CK)
* Hydrogen cyanide (AC)
* Arsine (SA)

Blister

* Ethyldichloroarsine (ED)
* Methyldichloroarsine (MD)
* Phenyldichloroarsine (PD)
* Lewisite (L)
* Mustard gas
(HD H HT HL HQ)

* Nitrogen mustard

* HN1
* HN2
* HN3

Nerve

|  G-agents

* Tabun (GA)
* Sarin (GB)
* Chlorosarin (GC)
* Soman (GD)
* Ethylsarin (GE)
* Cyclosarin (GF)
* GV

V-agents

* EA-3148
* V-sub x/GD-7,
* VE
* VG
* VM
* VP
* VR
* VS
* VX

Novichok agents

* A-230
* A-232
* A-234
* A-242
* A-262
* C01-A035
* C01-A039
* C01-A042

Nettle

* Phosgene oxime (CX)
* C01-A035
* C01-A039

Pulmonary/choking

* Chlorine
* Chloropicrin (PS)
* Phosgene (CG)

* Diphosgene (DP)
* Disulfur decafluoride

Vomiting

* Adamsite
* Chloropicrin
* Diphenylchlorarsine
* Diphenylcyanoarsine
* Diphenylamincyanoarsine

Incapacitating agents

* Agent 15 (BZ)
* Dimethylheptylpyran (DMHP)

* EA-3167
* Kolokol-1

* PAVA spray
* Sleeping gas

Riot-control (RCAs)

* Xylyl bromide
* Pepper spray (OC)
* CS
* CN (mace)
* CR

* List of chemical warfare agents

* v
* t
* e

Weapons of mass destruction

File:WMD world map.svg
By type

* Biological
* Chemical
* Nuclear
* Radiological

By country

* Albania
* Algeria
* Argentina
* Australia
* Brazil
* Bulgaria
* Canada
* China
* Egypt
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* Germany
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* Iran
* Iraq
* Israel
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* Japan
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* Mexico
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* Netherlands
* North Korea
* Pakistan
* Philippines
* Poland
* Rhodesia
* Romania
* Russia
* Saudi Arabia
* South Africa
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* United Kingdom
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Proliferation

* Chemical
* Nuclear
* Missiles

Treaties

* List of treaties (treaty parties)

* Category Category

* v
* t
* e

Chemical warfare (CW) involves using the toxic properties of chemical substances as weapons. This type of warfare is distinct from nuclear warfare, biological warfare and radiological warfare, which together make up CBRN, the military acronym for chemical, biological, radiological, and nuclear (warfare or weapons), all of which are considered "weapons of mass destruction" (WMDs), a term that contrasts with conventional weapons.

The use of chemical weapons is prohibited under customary international humanitarian law.[1]

## Contents

* 1 Definition
* 2 History
* 3 Technology
* 3.1 Chemical warfare agents
* 3.1.1 Persistency
* 3.1.2 Classes
* 3.1.3 Designations
* 3.2 Delivery
* 3.2.1 Dispersion
* 3.2.2 Thermal dissemination
* 3.2.3 Aerodynamic dissemination
* 3.3 Protection against chemical warfare
* 3.3.1 Decontamination
* 4 Sociopolitical climate
* 4.1 Efforts to eradicate chemical weapons
* 4.2 Chemical weapon proliferation
* 5 Chemical weapons destruction
* 5.1 India
* 5.2 Iraq
* 5.3 Japan
* 5.4 Russia
* 5.5 United States
* 6 Anti-agriculture
* 6.1 Herbicidal warfare
* 6.2 Anti-livestock
* 7 See also
* 8 Notes
* 9 References
* 10 Further reading
* 11 External links

## Definition[edit | edit source]

Chemical warfare is different from the use of conventional weapons or nuclear weapons because the destructive effects of chemical weapons are not primarily due to any explosive force. The offensive use of living organisms (such as anthrax) is considered biological warfare rather than chemical warfare; however, the use of nonliving toxic products produced by living organisms (e.g. toxins such as botulinum toxin, ricin, and saxitoxin) is considered chemical warfare under the provisions of the Chemical Weapons Convention (CWC). Under this convention, any toxic chemical, regardless of its origin, is considered a chemical weapon unless it is used for purposes that are not prohibited (an important legal definition known as the General Purpose Criterion).[2]

About 70 different chemicals have been used or stockpiled as chemical warfare agents during the 20th century. The entire class known as Lethal Unitary Chemical Agents and Munitions have been scheduled for elimination by the CWC.[3]

Under the convention, chemicals that are toxic enough to be used as chemical weapons, or that may be used to manufacture such chemicals, are divided into three groups according to their purpose and treatment:

* Schedule 1 – Have few, if any, legitimate uses. These may only be produced or used for research, medical, pharmaceutical or protective purposes (i.e. testing of chemical weapons sensors and protective clothing). Examples include nerve agents, ricin, lewisite and mustard gas. Any production over 100 g must be reported to the OPCW and a country can have a stockpile of no more than one tonne of these chemicals.[citation needed]
* Schedule 2 – Have no large-scale industrial uses, but may have legitimate small-scale uses. Examples include dimethyl methylphosphonate, a precursor to sarin also used as a flame retardant, and thiodiglycol, a precursor chemical used in the manufacture of mustard gas but also widely used as a solvent in inks.
* Schedule 3 – Have legitimate large-scale industrial uses. Examples include phosgene and chloropicrin. Both have been used as chemical weapons but phosgene is an important precursor in the manufacture of plastics and chloropicrin is used as a fumigant. The OPCW must be notified of, and may inspect, any plant producing more than 30 tons per year.

## History[edit | edit source]

Main article: History of chemical warfare

File:Sargent, John Singer (RA) - Gassed - Google Art Project.jpg

John Singer Sargent's iconic World War I painting: Gassed, showing blind casualties on a battlefield after a mustard gas attack

Simple chemical weapons were used sporadically throughout antiquity and into the Industrial age.[4] It was not until the 19th century that the modern conception of chemical warfare emerged, as various scientists and nations proposed the use of asphyxiating or poisonous gasses.

Multiple international treaties were passed banning chemical weapons based upon the alarm of nations and scientists. This however did not prevent the extensive use of chemical weapons in World War I. The development of chlorine gas, among others, was used by both sides to try to break the stalemate of trench warfare. Though largely ineffective over the long run, it decidedly changed the nature of the war. In many cases the gasses used did not kill, but instead horribly maimed, injured, or disfigured casualties. Some 1.3 million gas casualties were recorded, which may have included up to 260,000 civilian casualties.[5][6][7]

File:Fritz Haber.png

Fritz Haber is considered the "father of chemical warfare" for his years of pioneering work developing and weaponizing chlorine and other poisonous gases during World War I.

The interwar years saw occasional use of chemical weapons, mainly to put down rebellions.[8] In Nazi Germany, much research went into developing new chemical weapons, such as potent nerve agents.[9] However, chemical weapons saw little battlefield use in World War II. Both sides were prepared to use such weapons, but the Allied powers never did, and the Axis used them only very sparingly. The reason for the lack of use by the Nazis, despite the considerable efforts that had gone into developing new varieties, might have been a lack of technical ability or fears that the Allies would retaliate with their own chemical weapons. Those fears were not unfounded: the Allies made comprehensive plans for defensive and retaliatory use of chemical weapons, and stockpiled large quantities.[10][11] Japanese forces used them more widely, though only against their Asian enemies, as they also feared that using it on Western powers would result in retaliation. Chemical weapons were frequently used against Kuomintang and Chinese communist troops.[12] However, the Nazis did extensively use poison gas against civilians in The Holocaust. Vast quantities of Zyklon B gas and carbon monoxide were used in the gas chambers of Nazi extermination camps, resulting in the overwhelming majority of some three million deaths. This remains the deadliest use of poison gas in history.[13][14][15][16]

The post-war era has seen limited, though devastating, use of chemical weapons. During the Vietnam War, between 1962 and 1971, the United States military sprayed nearly 20,000,000 U.S. gallons (76,000 m3) of various chemicals – the "rainbow herbicides" and defoliants – in Vietnam, eastern Laos, and parts of Cambodia as part of Operation Ranch Hand, reaching its peak from 1967 to 1969.[17] Some 100,000 Iranian troops were casualties of Iraqi chemical weapons during the Iran–Iraq War.[18][19][20] Iraq used mustard gas and nerve agents against its own civilians in the 1988 Halabja chemical attack.[21] The Cuban intervention in Angola saw limited use of organophosphates.[22] The Syrian government has used sarin, chlorine, and mustard gas in the Syrian civil war – generally against civilians.[23][24] Terrorist groups have also used chemical weapons, notably in the Tokyo subway sarin attack and the Matsumoto incident.[25][26] See also chemical terrorism.

## Technology[edit | edit source]

See also: Chemical weapon

Chemical warfare technology timeline Year  | Agents | Dissemination | Protection | Detection

|
|
|
|

1914 | Chlorine
Chloropicrin
Phosgene
Sulfur mustard | Wind dispersal  | Gas masks, urine-soaked gauze  | Smell
1918 | Lewisite | Chemical shells  | Gas mask
Rosin oil clothing  | smell of geraniums
1920s |  | Projectiles w/ central bursters  | CC-2 clothing  |
1930s | G-series nerve agents | Aircraft bombs  |  | Blister agent detectors
Color change paper
1940s |  | Missile warheads
Spray tanks  | Protective ointment (mustard)
Collective protection
Gas mask w/ whetlerite  |
1950s |  |  |  |
1960s | V-series nerve agents | Aerodynamic  | Gas mask w/ water supply  | Nerve gas alarm
1970s |  |  |  |
1980s |  | Binary munitions  | Improved gas masks
(protection, fit, comfort)  | Laser detection
1990s | Novichok nerve agents |  |  |

File:Chemical agent protection.jpg

A Swedish Army soldier wearing a chemical agent protective suit (C-vätskeskydd) and protection mask (skyddsmask 90)

Although crude chemical warfare has been employed in many parts of the world for thousands of years,[27] "modern" chemical warfare began during World War I – see Chemical weapons in World War I.

Initially, only well-known commercially available chemicals and their variants were used. These included chlorine and phosgene gas. The methods used to disperse these agents during battle were relatively unrefined and inefficient. Even so, casualties could be heavy, due to the mainly static troop positions which were characteristic features of trench warfare.

Germany, the first side to employ chemical warfare on the battlefield,[28] simply opened canisters of chlorine upwind of the opposing side and let the prevailing winds do the dissemination. Soon after, the French modified artillery munitions to contain phosgene – a much more effective method that became the principal means of delivery.[29]

Since the development of modern chemical warfare in World War I, nations have pursued research and development on chemical weapons that falls into four major categories: new and more deadly agents; more efficient methods of delivering agents to the target (dissemination); more reliable means of defense against chemical weapons; and more sensitive and accurate means of detecting chemical agents.

### Chemical warfare agents[edit | edit source]

See also: List of chemical warfare agents

The chemical used in warfare is called a chemical warfare agent (CWA). About 70 different chemicals have been used or stockpiled as chemical warfare agents during the 20th and 21st centuries. These agents may be in liquid, gas or solid form. Liquid agents that evaporate quickly are said to be volatile or have a high vapor pressure. Many chemical agents are made volatile so they can be dispersed over a large region quickly.[citation needed][30]

The earliest target of chemical warfare agent research was not toxicity, but development of agents that can affect a target through the skin and clothing, rendering protective gas masks useless. In July 1917, the Germans employed sulfur mustard. Mustard agents easily penetrate leather and fabric to inflict painful burns on the skin.

Chemical warfare agents are divided into lethal and incapacitating categories. A substance is classified as incapacitating if less than 1/100 of the lethal dose causes incapacitation, e.g., through nausea or visual problems. The distinction between lethal and incapacitating substances is not fixed, but relies on a statistical average called the LD50.

#### Persistency[edit | edit source]

Chemical warfare agents can be classified according to their persistency, a measure of the length of time that a chemical agent remains effective after dissemination. Chemical agents are classified as persistent or nonpersistent.

Agents classified as nonpersistent lose effectiveness after only a few minutes or hours or even only a few seconds. Purely gaseous agents such as chlorine are nonpersistent, as are highly volatile agents such as sarin. Tactically, nonpersistent agents are very useful against targets that are to be taken over and controlled very quickly.

Apart from the agent used, the delivery mode is very important. To achieve a nonpersistent deployment, the agent is dispersed into very small droplets comparable with the mist produced by an aerosol can. In this form not only the gaseous part of the agent (around 50%) but also the fine aerosol can be inhaled or absorbed through pores in the skin.

Modern doctrine requires very high concentrations almost instantly in order to be effective (one breath should contain a lethal dose of the agent). To achieve this, the primary weapons used would be rocket artillery or bombs and large ballistic missiles with cluster warheads. The contamination in the target area is only low or not existent and after four hours sarin or similar agents are not detectable anymore.

By contrast, persistent agents tend to remain in the environment for as long as several weeks, complicating decontamination. Defense against persistent agents requires shielding for extended periods of time. Non-volatile liquid agents, such as blister agents and the oily VX nerve agent, do not easily evaporate into a gas, and therefore present primarily a contact hazard.

The droplet size used for persistent delivery goes up to 1 mm increasing the falling speed and therefore about 80% of the deployed agent reaches the ground, resulting in heavy contamination. Deployment of persistent agents is intended to constrain enemy operations by denying access to contaminated areas.

Possible targets include enemy flank positions (averting possible counterattacks), artillery regiments, command posts or supply lines. Because it is not necessary to deliver large quantities of the agent in a short period of time, a wide variety of weapons systems can be used.

A special form of persistent agents are thickened agents. These comprise a common agent mixed with thickeners to provide gelatinous, sticky agents. Primary targets for this kind of use include airfields, due to the increased persistency and difficulty of decontaminating affected areas.

#### Classes[edit | edit source]

Chemical weapons are agents that come in four categories: choking, blister, blood and nerve.[31] The agents are organized into several categories according to the manner in which they affect the human body. The names and number of categories varies slightly from source to source, but in general, types of chemical warfare agents are as follows:

Classes of chemical weapon agents Class of agent | Agent Names | Mode of Action | Signs and Symptoms | Rate of action | Persistency

|
|
|
|
|

Nerve |

* Cyclosarin (GF)
* Sarin (GB)
* Soman (GD)
* Tabun (GA)
* VX
* VR
* Some insecticides
* Novichok agents

| Inactivates enzyme acetylcholinesterase, preventing the breakdown of the neurotransmitter acetylcholine in the victim's synapses and causing both muscarinic and nicotinic effects  |

* Miosis (pinpoint pupils)
* Blurred/dim vision
* Headache
* Nausea, vomiting, diarrhea
* Copious secretions/sweating
* Muscle twitching/fasciculations
* Dyspnea
* Seizures
* Loss of consciousness

* Vapors: seconds to minutes;
* Skin: 2 to 18 hours

| VX is persistent and a contact hazard; other agents are non-persistent and present mostly inhalation hazards.
Asphyxiant/Blood |

* Most Arsines
* Cyanogen chloride
* Hydrogen cyanide

* Arsine: Causes intravascular hemolysis that may lead to renal failure.
* Cyanogen chloride/hydrogen cyanide: Cyanide directly prevents cells from using oxygen. The cells then use anaerobic respiration, creating excess lactic acid and metabolic acidosis.

* Possible cherry-red skin
* Possible cyanosis
* Confusion
* Nausea
* Patients may gasp for air
* Seizures prior to death
* Metabolic acidosis

| Immediate onset  | Non-persistent and an inhalation hazard.
Vesicant/Blister |

* Sulfur mustard (HD, H)
* Nitrogen mustard (HN-1, HN-2, HN-3)
* Lewisite (L)
* Phosgene oxime (CX)

| Agents are acid-forming compounds that damages skin and respiratory system, resulting burns and respiratory problems.  |

* Severe skin, eye and mucosal pain and irritation
* Skin erythema with large fluid blisters that heal slowly and may become infected
* Tearing, conjunctivitis, corneal damage
* Mild respiratory distress to marked airway damage

* Mustards: Vapors: 4 to 6 hours, eyes and lungs affected more rapidly; Skin: 2 to 48 hours
* Lewisite: Immediate

| Persistent and a contact hazard.
Choking/Pulmonary |

* Chlorine
* Hydrogen chloride
* Nitrogen oxides
* Phosgene

| Similar mechanism to blister agents in that the compounds are acids or acid-forming, but action is more pronounced in respiratory system, flooding it and resulting in suffocation; survivors often suffer chronic breathing problems.  |

* Airway irritation
* Eye and skin irritation
* Dyspnea, cough
* Sore throat
* Chest tightness
* Wheezing
* Bronchospasm

| Immediate to 3 hours  | Non-persistent and an inhalation hazard.
Lachrymatory agent |

* Tear gas
* Pepper spray

| Causes severe stinging of the eyes and temporary blindness.  | Powerful eye irritation  | Immediate  | Non-persistent and an inhalation hazard.
Incapacitating |

* Agent 15 (BZ)

| Causes atropine-like inhibition of acetylcholine in subject. Causes peripheral nervous system effects that are the opposite of those seen in nerve agent poisoning.  |

* May appear as mass drug intoxication with erratic behaviors, shared realistic and distinct hallucinations, disrobing and confusion
* Hyperthermia
* Ataxia (lack of coordination)
* Mydriasis (dilated pupils)
* Dry mouth and skin

* Inhaled: 30 minutes to 20 hours;
* Skin: Up to 36 hours after skin exposure to BZ. Duration is typically 72 to 96 hours.

| Extremely persistent in soil and water and on most surfaces; contact hazard.
Cytotoxic proteins |

Non-living biological proteins, such as:

* Ricin
* Abrin

| Inhibit protein synthesis |

* Latent period of 4-8 hours, followed by flu-like signs and symptoms
* Progress within 18-24 hours to:
* Inhalation: nausea, cough, dyspnea, pulmonary edema
* Ingestion: Gastrointestinal hemorrhage with emesis and bloody diarrhea; eventual liver and kidney failure.

| 4–24 hours; see symptoms. Exposure by inhalation or injection causes more pronounced signs and symptoms than exposure by ingestion | Slight; agents degrade quickly in environment

There are other chemicals used militarily that are not scheduled by the Chemical Weapons Convention, and thus are not controlled under the CWC treaties. These include:

* Defoliants and herbicides that destroy vegetation, but are not immediately toxic or poisonous to human beings. Their use is classified as herbicidal warfare. Some batches of Agent Orange, for instance, used by the British during the Malayan Emergency and the United States during the Vietnam War, contained dioxins as manufacturing impurities. Dioxins, rather than Agent Orange itself, have long-term cancer effects and for causing genetic damage leading to serious birth defects.
* Incendiary or explosive chemicals (such as napalm, extensively used by the United States during the Korean War and the Vietnam War, or dynamite) because their destructive effects are primarily due to fire or explosive force, and not direct chemical action. Their use is classified as conventional warfare.
* Viruses, bacteria, or other organisms. Their use is classified as biological warfare. Toxins produced by living organisms are considered chemical weapons, although the boundary is blurry. Toxins are covered by the Biological Weapons Convention.

#### Designations[edit | edit source]

Further information: chemical weapon designation

Most chemical weapons are assigned a one- to three-letter "NATO weapon designation" in addition to, or in place of, a common name. Binary munitions, in which precursors for chemical warfare agents are automatically mixed in shell to produce the agent just prior to its use, are indicated by a "-2" following the agent's designation (for example, GB-2 and VX-2).

Some examples are given below:

Blood agents: | Vesicants:

|

* Cyanogen chloride: CK
* Hydrogen cyanide: AC

* Lewisite: L
* Sulfur mustard: H, HD, HS, HT

Pulmonary agents: | Incapacitating agents:

* Phosgene: CG

* Quinuclidinyl benzilate: BZ

Lachrymatory agents: | Nerve agents:

* Pepper spray: OC
* Tear gas: CN, CS, CR

* Sarin: GB
* VE, VG, VM, VX

### Delivery[edit | edit source]

The most important factor in the effectiveness of chemical weapons is the efficiency of its delivery, or dissemination, to a target. The most common techniques include munitions (such as bombs, projectiles, warheads) that allow dissemination at a distance and spray tanks which disseminate from low-flying aircraft. Developments in the techniques of filling and storage of munitions have also been important.

Although there have been many advances in chemical weapon delivery since World War I, it is still difficult to achieve effective dispersion. The dissemination is highly dependent on atmospheric conditions because many chemical agents act in gaseous form. Thus, weather observations and forecasting are essential to optimize weapon delivery and reduce the risk of injuring friendly forces.[citation needed]

#### Dispersion[edit | edit source]

File:Poison gas attack.jpg

Dispersion of chlorine in World War I

Dispersion is placing the chemical agent upon or adjacent to a target immediately before dissemination, so that the material is most efficiently used. Dispersion is the simplest technique of delivering an agent to its target. The most common techniques are munitions, bombs, projectiles, spray tanks and warheads.

World War I saw the earliest implementation of this technique. The actual first chemical ammunition was the French 26 mm cartouche suffocante rifle grenade, fired from a flare carbine. It contained 35g of the tear-producer ethyl bromoacetate, and was used in autumn 1914 – with little effect on the Germans.

The Germans contrarily tried to increase the effect of 10.5 cm shrapnel shells by adding an irritant – dianisidine chlorosulfonate. Its use went unnoticed by the British when it was used against them at Neuve Chapelle in October 1914. Hans Tappen, a chemist in the Heavy Artillery Department of the War Ministry, suggested to his brother, the Chief of the Operations Branch at German General Headquarters, the use of the tear-gases benzyl bromide or xylyl bromide.

Shells were tested successfully at the Wahn artillery range near Cologne on January 9, 1915, and an order was placed for 15 cm howitzer shells, designated 'T-shells' after Tappen. A shortage of shells limited the first use against the Russians at Bolimów on January 31, 1915; the liquid failed to vaporize in the cold weather, and again the experiment went unnoticed by the Allies.

The first effective use were when the German forces at the Second Battle of Ypres simply opened cylinders of chlorine and allowed the wind to carry the gas across enemy lines. While simple, this technique had numerous disadvantages. Moving large numbers of heavy gas cylinders to the front-line positions from where the gas would be released was a lengthy and difficult logistical task.

File:Poison Gas Attack Germany and Russia 1916.JPG

Aerial photograph of a German gas attack on Russian forces circa 1916

Stockpiles of cylinders had to be stored at the front line, posing a great risk if hit by artillery shells. Gas delivery depended greatly on wind speed and direction. If the wind was fickle, as at Loos, the gas could blow back, causing friendly casualties.

Gas clouds gave plenty of warning, allowing the enemy time to protect themselves, though many soldiers found the sight of a creeping gas cloud unnerving. This made the gas doubly effective, as, in addition to damaging the enemy physically, it also had a psychological effect on the intended victims.

Another disadvantage was that gas clouds had limited penetration, capable only of affecting the front-line trenches before dissipating. Although it produced limited results in World War I, this technique shows how simple chemical weapon dissemination can be.

Shortly after this "open canister" dissemination, French forces developed a technique for delivery of phosgene in a non-explosive artillery shell. This technique overcame many of the risks of dealing with gas in cylinders. First, gas shells were independent of the wind and increased the effective range of gas, making any target within reach of guns vulnerable. Second, gas shells could be delivered without warning, especially the clear, nearly odorless phosgene—there are numerous accounts of gas shells, landing with a "plop" rather than exploding, being initially dismissed as dud high explosive or shrapnel shells, giving the gas time to work before the soldiers were alerted and took precautions.

The major drawback of artillery delivery was the difficulty of achieving a killing concentration. Each shell had a small gas payload and an area would have to be subjected to saturation bombardment to produce a cloud to match cylinder delivery. A British solution to the problem was the Livens Projector. This was effectively a large-bore mortar, dug into the ground that used the gas cylinders themselves as projectiles – firing a 14 kg cylinder up to 1500 m. This combined the gas volume of cylinders with the range of artillery.

Over the years, there were some refinements in this technique. In the 1950s and early 1960s, chemical artillery rockets and cluster bombs contained a multitude of submunitions, so that a large number of small clouds of the chemical agent would form directly on the target.

#### Thermal dissemination[edit | edit source]

File:Mc-1 gas bomb.png

An American-made MC-1 gas bomb

Thermal dissemination is the use of explosives or pyrotechnics to deliver chemical agents. This technique, developed in the 1920s, was a major improvement over earlier dispersal techniques, in that it allowed significant quantities of an agent to be disseminated over a considerable distance. Thermal dissemination remains the principal method of disseminating chemical agents today.

Most thermal dissemination devices consist of a bomb or projectile shell that contains a chemical agent and a central "burster" charge; when the burster detonates, the agent is expelled laterally.

Thermal dissemination devices, though common, are not particularly efficient. First, a percentage of the agent is lost by incineration in the initial blast and by being forced onto the ground. Second, the sizes of the particles vary greatly because explosive dissemination produces a mixture of liquid droplets of variable and difficult to control sizes.

The efficacy of thermal detonation is greatly limited by the flammability of some agents. For flammable aerosols, the cloud is sometimes totally or partially ignited by the disseminating explosion in a phenomenon called flashing. Explosively disseminated VX will ignite roughly one third of the time. Despite a great deal of study, flashing is still not fully understood, and a solution to the problem would be a major technological advance.

Despite the limitations of central bursters, most nations use this method in the early stages of chemical weapon development, in part because standard munitions can be adapted to carry the agents.

File:Soviet chemical weapons canisters from a stockpile in Albania.jpg

Soviet chemical weapons canisters from a stockpile in Albania

#### Aerodynamic dissemination[edit | edit source]

Aerodynamic dissemination is the non-explosive delivery of a chemical agent from an aircraft, allowing aerodynamic stress to disseminate the agent. This technique is the most recent major development in chemical agent dissemination, originating in the mid-1960s.

This technique eliminates many of the limitations of thermal dissemination by eliminating the flashing effect and theoretically allowing precise control of particle size. In actuality, the altitude of dissemination, wind direction and velocity, and the direction and velocity of the aircraft greatly influence particle size. There are other drawbacks as well; ideal deployment requires precise knowledge of aerodynamics and fluid dynamics, and because the agent must usually be dispersed within the boundary layer (less than 200–300 ft (61–91 m) above the ground), it puts pilots at risk.

Significant research is still being applied toward this technique. For example, by modifying the properties of the liquid, its breakup when subjected to aerodynamic stress can be controlled and an idealized particle distribution achieved, even at supersonic speed. Additionally, advances in fluid dynamics, computer modeling, and weather forecasting allow an ideal direction, speed, and altitude to be calculated, such that warfare agent of a predetermined particle size can predictably and reliably hit a target.

### Protection against chemical warfare[edit | edit source]

File:Flickr - Israel Defense Forces - "Yanshuf" Battalion Soldiers at ABC Warfare Exercise, Nov 2010.jpg

Israel Defense Forces "Yanshuf" battalion soldiers at chemical warfare defense exercise

Ideal protection begins with nonproliferation treaties such as the Chemical Weapons Convention, and detecting, very early, the signatures of someone building a chemical weapons capability. These include a wide range of intelligence disciplines, such as economic analysis of exports of dual-use chemicals and equipment, human intelligence (HUMINT) such as diplomatic, refugee, and agent reports; photography from satellites, aircraft and drones (IMINT); examination of captured equipment (TECHINT); communications intercepts (COMINT); and detection of chemical manufacturing and chemical agents themselves (MASINT).

If all the preventive measures fail and there is a clear and present danger, then there is a need for detection of chemical attacks,[32] collective protection,[33][34][35] and decontamination. Since industrial accidents can cause dangerous chemical releases (e.g., the Bhopal disaster), these activities are things that civilian, as well as military, organizations must be prepared to carry out. In civilian situations in developed countries, these are duties of HAZMAT organizations, which most commonly are part of fire departments.

Detection has been referred to above, as a technical MASINT discipline; specific military procedures, which are usually the model for civilian procedures, depend on the equipment, expertise, and personnel available. When chemical agents are detected, an alarm needs to sound, with specific warnings over emergency broadcasts and the like. There may be a warning to expect an attack.

If, for example, the captain of a US Navy ship believes there is a serious threat of chemical, biological, or radiological attack, the crew may be ordered to set Circle William, which means closing all openings to outside air, running breathing air through filters, and possibly starting a system that continually washes down the exterior surfaces. Civilian authorities dealing with an attack or a toxic chemical accident will invoke the Incident Command System, or local equivalent, to coordinate defensive measures.[35]

Individual protection starts with a gas mask and, depending on the nature of the threat, through various levels of protective clothing up to a complete chemical-resistant suit with a self-contained air supply. The US military defines various levels of MOPP (mission-oriented protective posture) from mask to full chemical resistant suits; Hazmat suits are the civilian equivalent, but go farther to include a fully independent air supply, rather than the filters of a gas mask.

Collective protection allows continued functioning of groups of people in buildings or shelters, the latter which may be fixed, mobile, or improvised. With ordinary buildings, this may be as basic as plastic sheeting and tape, although if the protection needs to be continued for any appreciable length of time, there will need to be an air supply, typically an enhanced gas mask.[34][35]

File:Members of the Ukrainian Army’s 19th CBRN-Battalion maintaining decontamination skills in Support of Operation Iraqi Freedom at Camp Arifjan, in KUWAIT on August 3rd 2003.jpg

Members of the Ukrainian Army's 19th Nuclear, Biological and Chemical Battalion practice decontamination drill, at Camp Arifjan, Kuwait

#### Decontamination[edit | edit source]

Part of a series on

Pollution
File:Air pollution3.jpg

Air pollution from a factory in Nepal

Air

* Acid rain
* Air quality index
* Atmospheric dispersion modeling
* Chlorofluorocarbon
* Exhaust gas
* Haze
* Indoor air
* Internal combustion engine
* Global dimming
* Global distillation
* Ozone depletion
* Particulates
* Persistent organic pollutant
* Smog
* Aerosol
* Soot
* Volatile organic compound

Biological

* Biological hazard
* Genetic
* Introduced species (Invasive species)

Digital

* Information

Electromagnetic

* Light
* Ecological
* Overillumination
* Radio spectrum

Natural

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Soil

* Agricultural
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Solid waste

* Biodegradable waste
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* Satellite

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* Air travel
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* Chemical warfare
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* Nuclear holocaust (Nuclear fallout \- nuclear famine \- nuclear winter)
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Water

* Agricultural wastewater
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* Nonpoint source
* see Misc section
* Nutrient
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Misc

* Point source
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Lists

* Diseases
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Categories

* By country

*   *

* v
* t
* e

Decontamination varies with the particular chemical agent used. Some nonpersistent agents, including most pulmonary agents (chlorine, phosgene, and so on), blood gases, and nonpersistent nerve gases (e.g., GB), will dissipate from open areas, although powerful exhaust fans may be needed to clear out buildings where they have accumulated.

In some cases, it might be necessary to neutralize them chemically, as with ammonia as a neutralizer for hydrogen cyanide or chlorine. Riot control agents such as CS will dissipate in an open area, but things contaminated with CS powder need to be aired out, washed by people wearing protective gear, or safely discarded.

Mass decontamination is a less common requirement for people than equipment, since people may be immediately affected and treatment is the action required. It is a requirement when people have been contaminated with persistent agents. Treatment and decontamination may need to be simultaneous, with the medical personnel protecting themselves so they can function.[36]

There may need to be immediate intervention to prevent death, such as injection of atropine for nerve agents. Decontamination is especially important for people contaminated with persistent agents; many of the fatalities after the explosion of a WWII US ammunition ship carrying sulfur mustard, in the harbor of Bari, Italy, after a German bombing on December 2, 1943, came when rescue workers, not knowing of the contamination, bundled cold, wet seamen in tight-fitting blankets.

For decontaminating equipment and buildings exposed to persistent agents, such as blister agents, VX or other agents made persistent by mixing with a thickener, special equipment and materials might be needed. Some type of neutralizing agent will be needed; e.g. in the form of a spraying device with neutralizing agents such as Chlorine, Fichlor, strong alkaline solutions or enzymes. In other cases, a specific chemical decontaminant will be required.[35]

## Sociopolitical climate[edit | edit source]

There are many instances of the use of chemical weapons in battles documented in Greek and Roman historical texts; the earliest example was the deliberate poisoning of Kirrha's water supply with hellebore in the First Sacred War, Greece, about 590 BC.[37]

One of the earliest reactions to the use of chemical agents was from Rome. Struggling to defend themselves from the Roman legions, Germanic tribes poisoned the wells of their enemies, with Roman jurists having been recorded as declaring "armis bella non venenis geri", meaning "war is fought with weapons, not with poisons." Yet the Romans themselves resorted to poisoning wells of besieged cities in Anatolia in the 2nd century BCE.[38]

Before 1915 the use of poisonous chemicals in battle was typically the result of local initiative, and not the result of an active government chemical weapons program. There are many reports of the isolated use of chemical agents in individual battles or sieges, but there was no true tradition of their use outside of incendiaries and smoke. Despite this tendency, there have been several attempts to initiate large-scale implementation of poison gas in several wars, but with the notable exception of World War I, the responsible authorities generally rejected the proposals for ethical reasons or fears of retaliation.

For example, in 1854 Lyon Playfair (later 1st Baron Playfair, GCB, PC, FRS (1818–1898), a British chemist, proposed using a cacodyl cyanide-filled artillery shell against enemy ships during the Crimean War. The British Ordnance Department rejected the proposal as "as bad a mode of warfare as poisoning the wells of the enemy."

### Efforts to eradicate chemical weapons[edit | edit source]

See also: List of chemical arms control agreements

Countries with known or possible chemical weapons, as of 2021

Nation | CW Possession[citation needed] | Signed CWC | Ratified CWC
Albania | Eliminated, 2007  | January 14, 1993[39] | May 11, 1994[39]
China | Probable  | January 13, 1993  | April 4, 1997
Egypt | Probable  | No  | No
India | Eliminated, 2009  | January 14, 1993  | September 3, 1996
Iran | Possible  | January 13, 1993  | November 3, 1997
Iraq | Eliminated, 2018  | January 13, 2009  | February 12, 2009
Israel | Probable  | January 13, 1993[40] | No
Japan | Probable  | January 13, 1993  | September 15, 1995
Libya | Eliminated, 2014  | No  | January 6, 2004
(acceded)
Myanmar (Burma)  | Possible  | January 14, 1993[40] | July 8, 2015[41]
North Korea | Known  | No  | No
Russia | Eliminated, 2017  | January 13, 1993  | November 5, 1997
Serbia
and Montenegro | Probable  | No  | April 20, 2000
(acceded)
Sudan | Possible  | No  | May 24, 1999
(acceded)
Syria | Eliminated, 2014  | No  | September 14, 2013
(acceded)
Taiwan | Possible  | n/a  | n/a
United States | Known  | January 13, 1993  | April 25, 1997
Vietnam | Possible  | January 13, 1993  | September 30, 1998

* August 27, 1874: The Brussels Declaration Concerning the Laws and Customs of War is signed, specifically forbidding the "employment of poison or poisoned weapons", although the treaty was not adopted by any nation whatsoever and it never went into effect.
* September 4, 1900: The First Hague Convention, which includes a declaration banning the "use of projectiles the object of which is the diffusion of asphyxiating or deleterious gases," enters into force.
* January 26, 1910: The Second Hague Convention enters into force, prohibiting the use of "poison or poisoned weapons" in warfare.
* February 6, 1922: After World War I, the Washington Arms Conference Treaty prohibited the use of asphyxiating, poisonous or other gases. It was signed by the United States, Britain, Japan, France, and Italy, but France objected to other provisions in the treaty and it never went into effect.
* February 8, 1928: The Geneva Protocol enters into force, prohibiting the use of "asphyxiating, poisonous or other gases, and of all analogous liquids, materials or devices" and "bacteriological methods of warfare".

### Chemical weapon proliferation[edit | edit source]

Main article: Chemical weapon proliferation

Despite numerous efforts to reduce or eliminate them, some nations continue to research and/or stockpile chemical warfare agents. To the right is a summary of the nations that have either declared weapon stockpiles or are suspected of secretly stockpiling or possessing CW research programs. Notable examples include United States and Russia.

In 1997, future US Vice President Dick Cheney opposed the signing ratification of a treaty banning the use of chemical weapons, a recently unearthed letter shows. In a letter dated April 8, 1997, then Halliburton-CEO Cheney told Sen. Jesse Helms, the chairman of the Senate Foreign Relations Committee, that it would be a mistake for America to join the convention. "Those nations most likely to comply with the Chemical Weapons Convention are not likely to ever constitute a military threat to the United States. The governments we should be concerned about are likely to cheat on the CWC, even if they do participate," reads the letter,[42] published by the Federation of American Scientists.

The CWC was ratified by the Senate that same month. Since then, Albania, Libya, Russia, the United States, and India have declared over 71,000 metric tons of chemical weapon stockpiles, and destroyed about a third of them. Under the terms of the agreement, the United States and Russia agreed to eliminate the rest of their supplies of chemical weapons by 2012. Not having met its goal, the U.S. government estimates remaining stocks will be destroyed by 2017.[citation needed][needs update]

## Chemical weapons destruction[edit | edit source]

### India[edit | edit source]

In June 1997, India declared that it had a stockpile of 1044 tons of sulphur mustard in its possession. India's declaration of its stockpile came after its entry into the Chemical Weapons Convention, that created the Organisation for the Prohibition of Chemical Weapons, and on January 14, 1993, India became one of the original signatories to the Chemical Weapons Convention. By 2005, from among six nations that had declared their possession of chemical weapons, India was the only country to meet its deadline for chemical weapons destruction and for inspection of its facilities by the Organisation for the Prohibition of Chemical Weapons.[43][44] By 2006, India had destroyed more than 75 percent of its chemical weapons and material stockpile and was granted an extension to complete a 100 percent destruction of its stocks by April 2009. On May 14, 2009, India informed the United Nations that it has completely destroyed its stockpile of chemical weapons.[45]

### Iraq[edit | edit source]

See also: Iraqi chemical warfare

The Director-General of the Organisation for the Prohibition of Chemical Weapons, Ambassador Rogelio Pfirter, welcomed Iraq's decision to join the OPCW as a significant step to strengthening global and regional efforts to prevent the spread and use of chemical weapons. The OPCW announced "The government of Iraq has deposited its instrument of accession to the Chemical Weapons Convention with the Secretary General of the United Nations and within 30 days, on 12 February 2009, will become the 186th State Party to the Convention". Iraq has also declared stockpiles of chemical weapons, and because of their recent accession is the only State Party exempted from the destruction time-line.[46]

### Japan[edit | edit source]

During the Second Sino-Japanese War (1937–1945) Japan stored chemical weapons on the territory of mainland China. The weapon stock mostly containing sulfur mustard-lewisite mixture.[47] The weapons are classified as abandoned chemical weapons under the Chemical Weapons Convention, and from September 2010 Japan has started their destruction in Nanjing using mobile destruction facilities in order to do so.[48]

### Russia[edit | edit source]

Russia signed into the Chemical Weapons Convention on January 13, 1993, and ratified it on November 5, 1995. Declaring an arsenal of 39,967 tons of chemical weapons in 1997, by far the largest arsenal, consisting of blister agents: Lewisite, Sulfur mustard, Lewisite-mustard mix, and nerve agents: Sarin, Soman, and VX. Russia met its treaty obligations by destroying 1 percent of its chemical agents by the 2002 deadline set out by the Chemical Weapons Convention, but requested an extension on the deadlines of 2004 and 2007 due to technical, financial, and environmental challenges of chemical disposal. Since, Russia has received help from other countries such as Canada which donated C$100,000, plus a further C$100,000 already donated, to the Russian Chemical Weapons Destruction Program. This money will be used to complete work at Shchuch'ye and support the construction of a chemical weapons destruction facility at Kizner (Russia), where the destruction of nearly 5,700 tons of nerve agent, stored in approximately 2 million artillery shells and munitions, will be undertaken. Canadian funds are also being used for the operation of a Green Cross Public Outreach Office, to keep the civilian population informed on the progress made in chemical weapons destruction activities.[49]

As of July 2011, Russia has destroyed 48 percent (18,241 tons) of its stockpile at destruction facilities located in Gorny (Saratov Oblast) and Kambarka (Udmurt Republic) – where operations have finished – and Schuch'ye (Kurgan Oblast), Maradykovsky (Kirov Oblast), Leonidovka (Penza Oblast) whilst installations are under construction in Pochep (Bryansk Oblast) and Kizner (Udmurt Republic).[50] As August 2013, 76 percent (30,500 tons) were destroyed,[51] and Russia leaves the Cooperative Threat Reduction (CTR) Program, which partially funded chemical weapons destruction.[52]

In September 2017, OPCW announced that Russia had destroyed its entire chemical weapons stockpile.[53]

### United States[edit | edit source]

See also: United States and weapons of mass destruction § Chemical weapons

On November 25, 1969, President Richard Nixon unilaterally renounced the offensive use of biological and toxic weapons, but the U.S. continued to maintain an offensive chemical weapons program.[54]

From May 1964 to the early 1970s the U.S. participated in Operation CHASE, a United States Department of Defense program that aimed to dispose of chemical weapons by sinking ships laden with the weapons in the deep Atlantic. After the Marine Protection, Research, and Sanctuaries Act of 1972, Operation Chase was scrapped and safer disposal methods for chemical weapons were researched, with the U.S. destroying several thousand tons of sulfur mustard by incineration at the Rocky Mountain Arsenal, and nearly 4,200 tons of nerve agent by chemical neutralisation at Tooele Army Depot.[55]

The U.S. began stockpile reductions in the 1980s with the removal of outdated munitions and destroying its entire stock of 3-Quinuclidinyl benzilate (BZ or Agent 15) at the beginning of 1988. In June 1990 the Johnston Atoll Chemical Agent Disposal System began destruction of chemical agents stored on the Johnston Atoll in the Pacific, seven years before the Chemical Weapons Treaty came into effect. In 1986 President Ronald Reagan made an agreement with the Chancellor, Helmut Kohl to remove the U.S. stockpile of chemical weapons from Germany. In 1990, as part of Operation Steel Box, two ships were loaded with over 100,000 shells containing Sarin and VX were taken from the U.S. Army weapons storage depots such as Miesau and then-classified FSTS (Forward Storage / Transportation Sites) and transported from Bremerhaven, Germany to Johnston Atoll in the Pacific, a 46-day nonstop journey.[56]

In the 1980s, Congress, at the urging of the Reagan administration, Congress provided funding for the manufacture of binary chemical weapons (sarin artillery shells) from 1987 until 1990, but this was halted after the U.S. and the Soviet Union entered into a bilateral agreement in June 1990.[54] In the 1990 agreement, the U.S. and Soviet Union agreed to begin destroying their chemical weapons stockpiles before 1993 and to reduce them to no more than 5,000 agent tons each by the end of 2002. The agreement also provided for exchanges of data and inspections of sites to verify destruction.[57] Following the collapse of the Soviet Union, the U.S.'s Nunn–Lugar Cooperative Threat Reduction program helped eliminate some of the chemical, biological and nuclear stockpiles of the former Soviet Union.[57]

The United Nations Conference on Disarmament in Geneva in 1980 led to the development of the Chemical Weapons Convention (CWC), a multilateral treaty that prohibited the development, production, stockpiling, and use of chemical weapons, and required the elimination of existing stockpiles.[58] The treaty expressly prohibited state parties from making reservations (unilateral caveats).[58] During the Reagan administration and the George H. W. Bush administration, the U.S. participated in the negotiations toward the CWC.[58] The CWC was concluded on September 3, 1992, and opened for signature on January 13, 1993. The U.S. became one of 87 original state parties to the CWC.[58] President Bill Clinton submitted it to the U.S. Senate for ratification on November 23, 1993. Ratification was blocked in the Senate for years, largely as a result of opposition from Senator Jesse Helms, the chairman of the Senate Foreign Relations Committee.[58] On April 24, 1997, the Senate gave its consent to ratification of the CWC by a 74–26 vote (satisfying the required two-thirds majority). The U.S. deposited its instrument of ratification at the United Nations on April 25, 1997, a few days before the CWC entered into force. The U.S. ratification allowed the U.S. to participate in the Organisation for the Prohibition of Chemical Weapons, the organization based in The Hague that oversees implementation of the CWC.[58]

Upon U.S. ratification of the CWC, the U.S. declared a total of 29,918 tons of chemical weapons, and committed to destroying all of the U.S.'s chemical weapons and bulk agent.[59] The U.S. was one of eight states to declare a stockpile of chemical weapons and to commit to their safe elimination.[60] The U.S. committed in the CWC to destroy its entire chemical arsenal within 10 years of the entry into force (i.e., by April 29, 2007),[59] However, at a 2012 conference,[61] the parties to the CWC parties agreed to extend the U.S. deadline to 2023.[59][61] By 2012, stockpiles had been eliminated at seven of the U.S.'s nine chemical weapons depots and 89.75% of the 1997 stockpile was destroyed.[62] The depots were the Aberdeen Chemical Agent Disposal Facility, Anniston Chemical Disposal Facility, Johnston Atoll, Newport Chemical Agent Disposal Facility, Pine Bluff Chemical Disposal Facility, Tooele Chemical Disposal Facility, Umatilla Chemical Disposal Facility,[61] and Deseret Chemical Depot.[62] The U.S. closed each site after the completion of stockpile destruction.[61] In 2019, the U.S. began to eliminate its chemical-weapon stockpile at the last of the nine U.S. chemical weapons storage facilities: the Blue Grass Army Depot in Kentucky.[59] By May 2021, the U.S. destroyed all of its Category 2 and Category 3 chemical weapons and 96.52% of its Category 1 chemical weapons.[60] The U.S. is scheduled to complete the elimination of all its chemical weapons by the September 2023 deadline.[59]

The U.S. has maintained a "calculated ambiguity" policy that warns potential adversaries that a chemical or biological attack against the U.S. or its allies will prompt a "overwhelming and devastating" response. The policy deliberately leaves open the question of whether the U.S. would respond to a chemical attempt with nuclear retaliation.[63] Commentators have noted that this policy gives policymakers more flexibility, at the possible cost of decreased strategic unpreparedness.[63]

## Anti-agriculture[edit | edit source]

### Herbicidal warfare[edit | edit source]

See also: Herbicidal warfare

File:A vietnamese Professor is pictured with a group of handicapped children.jpg

Disabled children in Vietnam, most of them impacted by Agent Orange, 2004

Although herbicidal warfare use chemical substances, its main purpose is to disrupt agricultural food production and/or to destroy plants which provide cover or concealment to the enemy.

The use of herbicides by the U.S. military during the Vietnam War has left tangible, long-term impacts upon the Vietnamese people and U.S. veterans of the war.[64][65] The government of Vietnam says that around 24% of the forests of Southern Vietnam were defoliated and up to four million people in Vietnam were exposed to Agent Orange. They state that as many as three million people have developed illness because of Agent Orange while the Red Cross of Vietnam estimates that up to one million people were disabled or have health problems associated with Agent Orange. The United States government has described these figures as unreliable.[66][67][68] During the war, the U.S. fought the North Vietnamese and their allies in Laos and Cambodia, dropping large quantities of Agent Orange in each of those countries. According on one estimate, the U.S. dropped 475,500 US gallons (1,800,000 l) of Agent Orange in Laos and 40,900 US gallons (155,000 l) in Cambodia.[69][70][71] Because Laos and Cambodia were officially neutral during the Vietnam War, the U.S. attempted to keep secret its military involvement in these countries. The U.S. has stated that Agent Orange was not widely used and therefore hasn't offered assistance to affected Cambodians or Laotians, and limits benefits American veterans and CIA personnel who were stationed there.[70][72]

### Anti-livestock[edit | edit source]

During the Mau Mau Uprising in 1952, the poisonous latex of the African milk bush was used to kill cattle.[73]

## See also[edit | edit source]

* 1990 Chemical Weapons Accord
* Ali Hassan al-Majid
* Area denial weapon
* Chemical weapon designation
* Chemical weapons and the United Kingdom
* Gas chamber
* List of CBRN warfare forces
* List of chemical warfare agents
* List of highly toxic gases
* Ronald Maddison
* Psychochemical weapon
* Saint Julien Memorial
* Sardasht, West Azerbaijan, a town attacked with chemical weapons during the Iran–Iraq War
* Stink bomb
* United States Army Medical Research Institute of Chemical Defense

## Notes[edit | edit source]

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3. ^ Disarmament lessons from the Chemical Weapons Convention Archived June 6, 2013, at the Wayback Machine
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37. ^ Adrienne Mayor, "Greek Fire, Poison Arrows & Scorpion Bombs: Biological and Chemical Warfare in the Ancient World" Overlook-Duckworth, 2003, rev ed with new Introduction 2008
38. ^ Mayor 2003
39. ^ a b "STATUS OF PARTICIPATION IN THE CHEMICAL WEAPONS CONVENTION AS AT 14 OCTOBER 2013". Organisation for the Prohibition of Chemical Weapons. October 14, 2013.
40. ^ a b "SIGNATORY STATES". Organisation for the Prohibition of Chemical Weapons. September 2, 2013.
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63. ^ a b Harry W. Conley (Spring 2003). "Not with Impunity: Assessing US Policy for Retaliating to a Chemical or Biological Attack". Air & Space Power Journal. Air University Press. 17 (1). Archived from the original on December 3, 2013.
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65. ^ Haberman, Clyde (May 11, 2014). "Agent Orange's Long Legacy, for Vietnam and Veterans". The New York Times.
66. ^ Stocking, Ben (June 14, 2007). "Agent Orange Still Haunts Vietnam, US". The Washington Post. ISSN 0190-8286. Archived from the original on March 30, 2017. Retrieved March 29, 2017.
67. ^ King, Jessica (August 10, 2012). "U.S. in first effort to clean up Agent Orange in Vietnam". CNN. Archived from the original on March 3, 2013. Retrieved August 11, 2012.
68. ^ Gustafson, Mai L. (1978). War and Shadows: The Haunting of Vietnam. Ithaca and London: Cornell University Press. p. 125.
69. ^ Nature, 17 Apr. 2003, "The extent and patterns of usage of Agent Orange and other herbicides in Vietnam", Vol. 422, p. 681
70. ^ a b The Atlantic, 20 Jul. 2019, "The U.S.'s Toxic Agent Orange Legacy: Washington Has Admitted to the Long-Lasting Effects of Dioxin Use in Vietnam, But Has Largely Sidestepped the Issue in Neighboring Cambodia and Laos"
71. ^ "Agent Orange's Legacy". The Cambodia Daily. March 20, 2004. Archived from the original on May 5, 2014. Retrieved May 5, 2014.
72. ^ "4 Decades on, U.S. Starts Cleanup of Agent Orange in Vietnam". The New York Times. New York. August 9, 2012. Retrieved May 5, 2014.
73. ^ Verdourt B, Trump EC, Church ME (1969). "Common poisonous plants of East Africa". London: Collins: 254. `{{cite journal}}`: Cite journal requires `|journal=` (help)

## References[edit | edit source]

* CBWInfo.com (2001). A Brief History of Chemical and Biological Weapons: Ancient Times to the 19th Century. Retrieved November 24, 2004.
* Chomsky, Noam (March 4, 2001). Prospects for Peace in the Middle East, page 2. Lecture.
* Cordette, Jessica, MPH(c) (2003). Chemical Weapons of Mass Destruction. Retrieved November 29, 2004.
* Croddy, Eric (2001), Chemical and Biological Warfare, Copernicus, ISBN 978-0-387-95076-1
* Smart, Jeffery K., M.A. (1997). History of Biological and Chemical Warfare. Retrieved November 24, 2004.
* United States Senate, 103d Congress, 2d Session. (May 25, 1994). The Riegle Report. Retrieved November 6, 2004.
* Gerard J Fitzgerald. American Journal of Public Health. Washington: Apr 2008. Vol. 98, Iss. 4; p. 611
* Гречко, А.А. (1976). Годы Войны. Военное Издательство Министерства Оборонны СССР.Москва.

## Further reading[edit | edit source]

* Leo P. Brophy and George J. B. Fisher; The Chemical Warfare Service: Organizing for War Office of the Chief of Military History, 1959; L. P. Brophy, W. D. Miles and C. C. Cochrane, The Chemical Warfare Service: From Laboratory to Field (1959); and B. E. Kleber and D. Birdsell, The Chemical Warfare Service in Combat (1966). official US history;
* Glenn Cross, Dirty War: Rhodesia and Chemical Biological Warfare, 1975–1980, Helion & Company, 2017
* Gordon M. Burck and Charles C. Flowerree; International Handbook on Chemical Weapons Proliferation 1991
* L. F. Haber. The Poisonous Cloud: Chemical Warfare in the First World War Oxford University Press: 1986
* James W. Hammond Jr; Poison Gas: The Myths Versus Reality Greenwood Press, 1999
* Jiri Janata, Role of Analytical Chemistry in Defense Strategies Against Chemical and Biological Attack, Annual Review of Analytical Chemistry, 2009
* Ishmael Jones, The Human Factor: Inside the CIA's Dysfunctional Intelligence Culture, Encounter Books, New York 2008, revised 2010, ISBN 978-1-59403-382-7. WMD espionage.
* Benoit Morel and Kyle Olson; Shadows and Substance: The Chemical Weapons Convention Westview Press, 1993
* Adrienne Mayor, "Greek Fire, Poison Arrows & Scorpion Bombs: Biological and Chemical Warfare in the Ancient World" Overlook-Duckworth, 2003, rev ed with new Introduction 2008
* Geoff Plunkett, Chemical Warfare in Australia: Australia's Involvement In Chemical Warfare 1914 – Today, (2nd Edition), 2013.. Leech Cup Books. A volume in the Army Military History Series published in association with the Army History Unit.
* Jonathan B. Tucker. Chemical Warfare from World War I to Al-Qaeda (2006)

## External links[edit | edit source]

File:Commons-logo.svg

Wikimedia Commons has media related to Chemical warfare.

* Official website of the Organisation for the Prohibition of Chemical Weapons (OPCW)
* Rule 74. The use of chemical weapons is prohibited. – section on chemical weapons from Customary IHL Database, an "updated version of the Study on customary international humanitarian law conducted by the International Committee of the Red Cross (ICRC) and originally published by Cambridge University Press."
* Chemical Warfare information page Archived November 13, 2012, at the Wayback Machine, from the Disaster Information Management Research Center of the U.S. Department of Health and Human Services including links to relevant sources in the U.S. National Library of Medicine

* v
* t
* e

* Agents used in chemical warfare
* incapacitation
* riot control

Blood agents|

* Cyanogen
* Cyanogen bromide
* Cyanogen chloride (CK)
* Hydrogen cyanide (AC)
* Arsine
* Cacodyl cyanide
* Cacodyl oxide
* Hydrogen sulfide
* Phosphine
* Carbon monoxide
* Phosphorus trifluoride
* Methyl cyanoformate
* Iron pentacarbonyl
* Nickel tetracarbonyl
* 2,3,7,8-Tetrachlorodibenzodioxin
* Glycolonitrile
* Lactonitrile
* Acetone cyanohydrin
* Stibine

Blister agents|

| Arsenicals|

* Ethyldichloroarsine (ED)
* Methyldichloroarsine (MD)
* Phenyldichloroarsine (PD)
* Lewisite (L)
* Lewisite 2 (L2)
* Lewisite 3 (L3)

|

Sulfur mustards|

* Levinstein mustard (EA-229)
* T
* Q
* CEES

Nitrogen mustards|

* HN1
* HN2
* HN3

Other|

* KB-16
* Dibutylchloromethyltin chloride
* Selenium oxychloride

Nerve agents|

| G-agents|

* Tabun (GA)
* Sarin (GB)
* Chlorosarin (ClGB)
* Thiosarin (SGB)
* Soman (GD)
* Chlorosoman (ClGD)
* Ethylsarin (GE)
* GH
* Cyclosarin (GF)
* GP
* Fluorotabun
* EA-1356
* EA-4352
* Crotylsarin

|

V-agents|

* EA-2192
* EA-3148
* VE
* VG
* VM
* VP
* VR
* VS
* VX
* EA-1763
* Chinese VX
* V-sub x (GD-7)

GV agents|

* GV (EA-5365)

Novichok agents|

* A-208
* A-232
* A-234
* A-242
* A-262
* C01-A035
* C01-A039
* C01-A042

Carbamates|

* Dimethylcarbamoyl fluoride
* EA-3966
* EA-3990
* EA-4056
* T-1123
* T-1152
* Octamethylene-bis(5-dimethylcarbamoxyisoquinolinium bromide)
* TL-599
* TL-1238
* TL-1299
* TL-1317
* Miotine (AR-28/T-1843)

Other|

* Diisopropyl fluorophosphate
* EA-2012
* EA-2054
* EA-2098
* EA-2613
* 2-Ethoxycarbonyl-1-methylvinyl cyclohexyl methylphosphonate
* Neopentylene fluorophosphate
* Selenophos
* Phospholine
* R-16661
* Ro 3-0422
* Methanesulfonyl fluoride
* Dimefox (TL-792)

Precursors|

* Acetonitrile
* AT
* ATO
* A.P.C. complex
* Chlorosarin
* Chlorosoman
* Cyclohexanol
* 1,8-Dibromooctane
* N,N-Diisopropylaminoethanol (KB)
* EA-1250
* DIHP
* ZS
* DEHP
* EA-1224
* Dimethylamidophosphoric dichloride
* Dimethylamidophosphoric dicyanide
* DMHP
* Formaldoxime
* Nital
* 4-Hydroxycoumarin
* Isopropyl alcohol (TB)
* Methyldichlorophosphine (SW)
* Methylphosphonyl difluoride (difluoro) (DF)
* Methylphosphonyl dichloride (dichloro)
* Nitromethane
* OPA mixture
* Phosphoryl chloride
* Phosphorus pentachloride
* Phosphorus trichloride (TH)
* Pinacolone
* Pinacolyl alcohol
* Phenacyl chloride
* QL
* 2,4,5-Trichlorophenol
* 3,3,5-Trimethylcyclohexanol
* Triethyl phosphite
* Trimethyl phosphite
* TC
* TG

Neurotoxins|

* Anatoxin-a
* Saxitoxin (TZ)
* Bungarotoxin
* Botulinum toxin (BTX)
* Tetanospasmin (TeNT)
* Ryanodine
* Ciguatoxin (CTX)
* Guanitoxin (GTX)
* Chlorophenylsilatrane
* Palytoxin (PTX)
* Maitotoxin (MTX)
* Tetrodotoxin
* Aconitine
* Brevetoxin (PbTX)
* Strychnine
* Antillatoxin (ATX)
* Tetraethyllead
* Dimethylmercury
* HN1 hydrochloride
* HN2 hydrochloride
* HN3 hydrochloride
* A-8564
* Sulfuryl fluoride
* Tremorine
* Oxotremorine
* Batrachotoxin
* Tetramethylenedisulfotetramine (TETS)
* Bicyclic phosphates
* IPTBO
* TBPO
* TBPS
* Cloflubicyne
* Trimethylolpropane phosphite
* Domoic acid

Nettle agents|

* Phosgene oxime (CX)

Pulmonary/
choking agents|

* Chlorine
* Bromine
* Phosgene (CG)
* Fluorine
* Perfluoroisobutene
* Chloropicrin (PS)
* Dimethyl(trifluoromethylthio)arsine
* Diphosgene (DP)
* Disulfur decafluoride (Z)
* Acrolein
* Ethyl bromoacetate
* Perchloromethyl mercaptan
* Phenylcarbylamine chloride
* Tetranitromethane
* Tetrachlorodinitroethane
* Chlorine trifluoride
* Perchloryl fluoride
* Cadmium oxide
* Cadmium chloride
* Mercuric chloride
* Selenium dioxide
* Selenoyl fluoride
* Trifluoronitrosomethane
* Trichloronitrosomethane
* Nitric oxide
* Nitrogen dioxide
* Dinitrogen tetroxide
* Sulfur dioxide
* Phosphorus trichloride
* Methyl isocyanate
* Ethenone
* Methyl vinyl ketone
* Trifluoroacetyl chloride
* Salcomine
* Fluomine
* Uranium hexafluoride
* Diborane
* Green Cross

Vomiting agents|

* Adamsite (DM)
* Chloropicrin
* Diphenylchlorarsine
* Diphenylcyanoarsine
* Cacodyl cyanide
* o-Dianisidine

Incapacitating
agents|

* BZ (CS-4030)
* Apomorphine
* Butyrophenone
* EA-4941 (CS-4640)
* Etorphine
* EA-2092
* CS-4297
* Etoxadrol
* Dimethylheptylpyran (DMHP)
* EA-2148
* EA-3167
* EA-3443
* Pethidine
* EA-3580
* EA-3834
* Kolokol-1
* LSD-25
* PAVA spray
* Psilocybin
* Sleeping gas
* Carfentanil
* JB-318
* JB-336
* CS-27349
* CAR-226,086
* CAR-301,060
* CAR-302,196
* CAR-302,282
* CAR-302,668
* Benperidol
* Desflurane
* Enflurane
* Isoflurane
* Halothane
* Sevoflurane
* Pentazocine
* Procarbazine
* Fluphenazine
* Chlorpromazine

Lachrymatory
agents|

* Xylyl bromide
* Pepper spray (OC)
* Mace (spray)
* CN
* CS
* CR
* CNS
* Benzyl chloride
* Benzyl bromide
* Benzyl iodide
* Bromobenzyl cyanide
* Thiophosgene
* Chloroacetone
* Bromoacetone
* Bromomethyl ethyl ketone
* Acrolein
* Phenacyl bromide
* Chloroacetophenone oxime
* Ethyl bromoacetate
* Ethyl iodoacetate
* Iodoacetone
* Allyl isothiocyanate
* Hexamethylene diisocyanate
* Crotonaldehyde

Malodorant agents|

* Thioacetone
* Allicin
* Skatole
* Cadaverine
* Putrescine

Biological toxins|

* Abrin
* Aconitine
* Aflatoxins
* Anatoxin-a
* Batrachotoxin
* Botulinum toxin
* Brevetoxin
* Ciguatoxin
* Domoic acid
* Enterotoxin type B
* Guanitoxin
* Maitotoxin
* Modeccin
* Palytoxin
* Ricin
* Saxitoxin
* Shiga toxin
* T-2 mycotoxin
* Tetanospasmin
* Tetrodotoxin
* Volkensin

Other|

* Methyl fluoroacetate
* Napalm (variants and mixtures)
* Fluoroethyl fluoroacetate
* Depleted uranium
* post-combustion uranium oxides
* Plutonium and its compounds
* Polonium
* White phosphorus

* List of chemical warfare agents
* CB military symbol

* v
* t
* e

Global catastrophic risks

* Future of the Earth
* Future of an expanding universe
* Ultimate fate of the universe

Technological|

* Chemical warfare
* Cyberattack
* Cyberwarfare
* Cyberterrorism
* Cybergeddon
* Gray goo
* Nanoweapons
* Kinetic bombardment
* Relativistic kinetic kill vehicle
* Nuclear warfare
* Mutual assured destruction
* Dead Hand
* Doomsday Clock
* Doomsday device
* Antimatter weapon
* Electromagnetic pulse (EMP)
* Safety of high-energy particle collision experiments
* Micro black hole
* Strangelet
* Synthetic intelligence / Artificial intelligence
* AI takeover
* Existential risk from artificial intelligence
* Technological singularity
* Transhumanism
* Year 2000 problem
* Year 2038 problem
* Year 10,000 problem

Sociological|

* Anthropogenic hazard
* Doomsday argument
* Self-Indication Assumption Doomsday argument rebuttal
* Self-referencing doomsday argument rebuttal
* Economic collapse
* Malthusian catastrophe
* New World Order (conspiracy theory)
* Nuclear holocaust
* winter
* famine
* cobalt
* Societal collapse
* Collapsology
* World War III

Ecological|

| Climate change|

* Anoxic event
* Biodiversity loss
* Mass mortality event
* Cascade effect
* Cataclysmic pole shift hypothesis
* Climate apocalypse
* Deforestation
* Desertification
* Extinction risk from global warming
* Tipping points in the climate system
* Flood basalt
* Global dimming
* Global terrestrial stilling
* Global warming
* Hypercane
* Ice age
* Ecocide
* Ecological collapse
* Environmental degradation
* Habitat destruction
* Human impact on the environment
* coral reefs
* on marine life
* Land degradation
* Land consumption
* Land surface effects on climate
* Ocean acidification
* Ozone depletion
* Resource depletion
* Sea level rise
* Supervolcano
* winter
* Verneshot
* Water pollution
* Water scarcity

|

Earth Overshoot Day|

* Overexploitation
* Overpopulation
* Human overpopulation

Biological|

| Extinction|

* Extinction event
* Holocene extinction
* Human extinction
* List of extinction events
* Genetic erosion
* Genetic pollution

|

Others|

* Biodiversity loss
* Decline in amphibian populations
* Decline in insect populations
* Biotechnology risk
* Biological agent
* Biological warfare
* Bioterrorism
* Colony Collapse Disorder
* Defaunation
* Interplanetary contamination
* Pandemic
* Pollinator decline
* Overfishing

Astronomical|

* Big Crunch
* Big Rip
* Coronal mass ejection
* Geomagnetic storm
* False vacuum decay
* Gamma-ray burst
* Heat death of the universe
* Proton decay
* Virtual black hole
* Impact event
* Asteroid impact avoidance
* Asteroid impact prediction
* Potentially hazardous object
* Near-Earth object
* winter
* Rogue planet
* Near-Earth supernova
* Hypernova
* Micronova
* Solar flare
* Stellar collision

Eschatological|

* Buddhist
* Maitreya
* Three Ages
* Hindu
* Kalki
* Kali Yuga
* Last Judgement
* Second Coming
* 1 Enoch
* Daniel
* Abomination of Desolation
* Prophecy of Seventy Weeks
* Messiah
* Christian
* Dispensationalism
* Futurism
* Historicism
* Interpretations of Revelation
* Idealism
* Preterism
* 2 Esdras
* 2 Thessalonians
* Man of sin
* Katechon
* Antichrist
* Book of Revelation
* Events
* Four Horsemen of the Apocalypse
* Lake of fire
* Number of the Beast
* Seven bowls
* Seven seals
* The Beast
* Two witnesses
* War in Heaven
* Whore of Babylon
* Great Apostasy
* New Earth
* New Jerusalem
* Olivet Discourse
* Great Tribulation
* Son of Perdition
* Sheep and Goats
* Islamic
* Al-Qa'im
* Beast of the Earth
* Dhul-Qarnayn
* Dhul-Suwayqatayn
* Dajjal
* Israfil
* Mahdi
* Sufyani
* Jewish
* Messiah
* War of Gog and Magog
* Third Temple
* Norse
* Zoroastrian
* Saoshyant

Others|

* 2011 end times prediction
* 2012 phenomenon
* Apocalypse
* Apocalyptic literature
* Apocalypticism
* Armageddon
* Blood moon prophecy
* Earth Changes
* End time
* Gog and Magog
* List of dates predicted for apocalyptic events
* Messianism
* Messianic Age
* Millenarianism
* Millennialism
* Premillennialism
* Amillennialism
* Postmillennialism
* Nemesis (hypothetical star)
* Nibiru cataclysm
* Rapture
* Prewrath
* Post-tribulation rapture
* Resurrection of the dead
* World to come

Fictional|

* Alien invasion
* Apocalyptic and post-apocalyptic fiction
* List of apocalyptic and post-apocalyptic fiction
* List of apocalyptic films
* Climate fiction
* Disaster films
* List of disaster films
* List of fictional doomsday devices
* Zombie apocalypse
* Zombie

Organizations|

* Centre for the Study of Existential Risk
* Future of Humanity Institute
* Future of Life Institute
* Nuclear Threat Initiative

General|

* Cyber ransom
* Cyberwarfare
* Depression
* Droughts
* Epidemic
* Famine
* Financial crisis
* Pandemic
* Riots
* Social crisis
* Survivalism

* '
* Category Categories
* Apocalypticism
* Future problems
* Hazards
* Risk analysis
* Doomsday scenarios

* v
* t
* e

Pollution

Air|

* Acid rain
* Air quality index
* Atmospheric dispersion modeling
* Chlorofluorocarbon
* Exhaust gas
* Haze
* Indoor air
* Internal combustion engine
* Global dimming
* Global distillation
* Ozone depletion
* Particulates
* Persistent organic pollutant
* Smog
* Aerosol
* Soot
* Volatile organic compound

Biological|

* Biological hazard
* Genetic pollution
* Introduced species (Invasive species)

Digital|

* Information pollution

Electromagnetic|

* Light
* Ecological light pollution
* Overillumination
* Radio spectrum pollution

Natural|

* Ozone
* Radium and radon in the environment
* Volcanic ash
* Wildfire

Noise|

* Transportation
* Land
* Water
* Air
* Rail
* Sustainable transport
* Urban
* Sonar
* Marine mammals and sonar
* Industrial
* Military
* Abstract
* Noise control

Radiation|

* Actinides
* Bioremediation
* Nuclear fission
* Nuclear fallout
* Plutonium
* Poisoning
* Radioactivity
* Uranium
* Electromagnetic radiation and health
* Radioactive waste

Soil|

* Agricultural pollution
* Herbicides
* Manure waste
* Pesticides
* Land degradation
* Bioremediation
* Open defecation
* Electrical resistance heating
* Soil guideline values
* Phytoremediation

Soild waste|

* Biodegradable waste
* Brown waste
* Electronic waste
* Battery recycling
* Food waste
* Green waste
* Hazardous waste
* Biomedical waste
* Chemical waste
* Construction waste
* Lead poisoning
* Mercury poisoning
* Toxic waste
* Industrial waste
* Lead smelting
* Litter
* Mining
* Coal mining
* Gold mining
* Surface mining
* Deep sea mining
* Mining waste
* Uranium mining
* Municipal solid waste
* Garbage
* Nanomaterials
* Plastic pollution
* Microplastics
* Packaging waste
* Post-consumer waste
* Waste management
* Landfill
* Thermal treatment

Space|

* Satellite

Visual|

* Air travel
* Clutter (advertising)
* Traffic signs
* Overhead power lines
* Vandalism

War|

* Chemical warfare
* Herbicidal warfare (Agent Orange)
* Nuclear holocaust (Nuclear fallout \- nuclear famine \- nuclear winter)
* Scorched earth
* Unexploded ordnance
* War and environmental law

Water|

* Agricultural wastewater
* Biological pollution
* Diseases
* Eutrophication
* Firewater
* Freshwater
* Groundwater
* Hypoxia
* Industrial wastewater
* Marine
* debris
* Monitoring
* Nonpoint source pollution
* Nutrient pollution
* Ocean acidification
* Oil spill
* Pharmaceuticals
* Sewage
* Septic tanks
* Pit latrine
* Shipping
* Stagnation
* Sulfur water
* Surface runoff
* Thermal
* Turbidity
* Urban runoff
* Water quality

Topics|

* Pollutants

Responses|

* Cleaner production
* Industrial ecology
* Pollution haven hypothesis
* Pollutant release and transfer register
* Polluter pays principle
* Pollution control
* Waste minimisation
* Zero waste

Lists|

* Diseases
* Law by country
* Most polluted cities
* Treaties

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