Southeast Asian haze

Short description: Fire-related air pollution issue

Southeast Asian haze

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A peat fire near the Raja Musa Forest Reserve in Selangor, Malaysia (2013). The fires are below the surface, where the peat is smoldering.

The Southeast Asian haze is a fire-related recurrent transboundary air pollution issue. Haze events, where air quality reaches hazardous levels due to high concentrations of airborne particulate matter from burning biomass,[1] have caused adverse health, environmental and economic impacts in several countries in Southeast Asia.[2][3] Caused primarily by slash-and-burn land clearing, the problem flares up every dry season to varying degrees[4] and generally is worst between July and October and during El Niño events.[5] Transboundary haze in Southeast Asia has been recorded since 1972[6] with the 1997 and 2015 events being particularly severe.[7]

Industrial-scale slash-and-burn practices to clear land for agricultural purposes are a major cause of the haze, particularly for palm oil and pulpwood production in the region. Burning land occurs as it is cheaper and faster compared to cutting and clearing using excavators or other machinery.[8][9][10] Fires started for this purpose sometimes spread and create forest fires, worsening the problem. The high concentration of peat in soil contributes to the haze's density and high sulphur content.

Fires in Indonesia (particularly South Sumatra and Riau in Sumatra, and Kalimantan in Borneo), and to a lesser extent in Malaysia and Thailand, have been identified as sources. The haze regularly has a major impact on air quality in Indonesia, Malaysia, Singapore and Brunei Darussalam; to a lesser extent and in particularly severe years, it also impacts the Philippines , Thailand, Vietnam, Cambodia and countries outside the region.[3]

Haze events have been shown to cause health issues and mortality in affected areas, and have caused disruption to economic activity and education as sectors are forced to close to minimise exposure to hazardous air. The haze also has a substantial environmental impact, being a major contributor to greenhouse gas emissions in the region and affecting wildlife and ecosystems.

The haze is an international issue which has caused regional political tensions. Efforts have been made to mitigate haze events and their impacts, and some relevant frameworks for regional cooperation among ASEAN countries have been introduced. Challenges remain in implementing these, and mitigation efforts have failed to prevent haze from reoccurring.

## Contents

* 1 Causes
* 1.1 Fire as a tool in land clearing
* 1.2 Land conflicts
* 1.3 Role of peat
* 2 History
* 3 Effects
* 3.1 Direct fire damage
* 3.2 Economy
* 3.3 Education
* 3.4 Health
* 3.5 Environment
* 4 Responses
* 5 Proposed solutions
* 5.1 Reduce the use of fire as a tool in land clearing
* 5.2 Land-use allocations and tenure
* 5.3 Reduce forest degrading practices
* 5.4 Capacity to prevent and suppress fires
* 5.5 Economic disincentives and incentives
* 6 See also
* 7 References

## Causes

Most haze events have resulted from smoke from fires that occurred on peatlands in Sumatra and the Kalimantan region of Borneo island.[11][12] Poor accountability and transparency of Indonesian agricultural companies, and limited political and economic incentives to hold companies to account, have been identified as key barriers to mitigating the issue.[13][14]

Undisturbed humid tropical forests are considered to be very resistant to fire, experiencing rare fires only during extraordinary dry periods.[15]

A study published in 2005 concluded that there is no single dominant cause of fire in a particular site and there are wide differences in the causes of fires in different sites. The study identified the following direct and indirect causes of fire:

>   * Direct causes of fire
>     * Fire as a tool in land clearing
>     * Fire as a weapon in land tenure or land use disputes
>     * Accidental or escaped fires
>     * Fire connected with resource extraction
>   * Indirect causes of fire
>     * Land tenure and land use allocation conflicts and competition
>     * Forest degrading practices
>     * Economic incentives/disincentives
>     * Population growth and migration
>     * Inadequate fire fighting and management capacity[16]

### Fire as a tool in land clearing

Fire is the cheapest and fastest method to clear land in preparation for planting. Fire is used to clear the plant material left over from logging or old crops. Mechanically raking the plant material into long piles and letting them rot over time, is expensive and slow, and could harbour pests. Clearing land with machines and chemicals can cost up to US$200 per hectare while using fire costs US$5 per hectare.[17]

After a peat swamp forest has been cleared and drained, the peat soil is still unsuitable for agriculture, because peat soil is nutrient-poor and acidic (pH 3 - 4). To make the soil suitable for agriculture, the pH has to be neutralised and nutrients added. Pests and plant diseases also have to be removed. One method is to use chemicals such as limestone to neutralise the acidity, as well as fertilisers and pesticides. This method costs about Rupiah 30 - 40 million per hectare. Alternatively, fire is used to clear the plant material left over from logging. The fire kills pests and the resulting ash serves to fertilise the soil and neutralise the acidity. This method costs Rupiah 2 million per hectare.[18]

### Land conflicts

In Indonesia, the Basic Forestry Law grants the Ministry of Forestry authority over all land classified as forests. Approximately 49% of the nation (909,070 square kilometres) is covered by actual forest, although the government classifies 69% of the land area (1,331,270 square kilometres) as forest. The land rights of traditional communities that live on land classified as forest cannot be registered and are generally unrecognised by the state.[19] Therefore, these communities do not really have the ability to enforce rules at the village level and exclude outsiders such as oil palm plantations, logging companies, residents of other villages, migrants, small-scale loggers or transmigrants. Competing claims in turn leads to land conflicts.[20] As the number of new, external actors increases, so does the likelihood that fire will be used as a weapon.[21]

### Role of peat

Further information: Peat swamp forest, Borneo peat swamp forests, and peat fire

Peat forms under waterlogged conditions in peat swamp forests such as this one in Raja Musa Forest Reserve, Selangor, Malaysia.

A peatland is an area where organic material such as leaves and twigs had accumulated naturally under waterlogged conditions in the last 10,000 years. This layer of organic material, known as peat, can be up to 20m deep. Indonesia has 265,500 km2 of peatland, which comprises 13.9% of its land area. Malaysia also has significant peatland in the Peninsular and Borneo, at 26,685 km2, covering 8.1% of its land area.[22]

Although originally a wetland ecosystem, much of the peatland in Southeast Asia have been drained for human activities such as agriculture, forestry and urban development. A report published in 2011 stated that more than 30% of peat swamp forests had been converted to agricultural land and a further 30% had been logged or degraded in the past 20 to 30 years.[23] Excessive drainage in peat results in the top layer of peat drying out. Due to its high carbon content, dry peat is extremely susceptible to burning, especially during the dry season.

Studies have shown that peat fires are a major contributor to the haze. In 2009, around 40% of all fires in Peninsular Malaysia, Borneo, Sumatra and Java were detected in peatlands, even though they cover only 10% of the land area studied.[15] The concentration of sulphur in rain falling over Singapore in 1997 correlated closely with the PM2.5 concentration, which can be attributed to the strong sulphur emission from peat fires.[24]

## History

Southeast Asian haze has frequently reoccurred, with the severity and regions affected differing between seasons.[7] The issue has been recorded since 1972.[6] The 1997 Southeast Asian haze, caused by major forest fires in Indonesia, is thought to be the most severe on record, leading to dangerous pollution across most of Southeast Asia and affecting air quality as far as Sri Lanka.[7] The 2015 haze has also been highlighted as a particularly severe year.[7] In 2020, lockdowns and other social movement restrictions introduced due to the COVID-19 pandemic are thought to have reduced air pollution across the region.[25]

* 1997 Southeast Asian haze
* 1997 Indonesian forest fires
* 2005 Malaysian haze
* 2006 Southeast Asian haze
* 2009 Southeast Asian haze
* 2010 Southeast Asian haze
* 2013 Southeast Asian haze
* 2015 Southeast Asian haze
* 2016 Southeast Asian haze
* 2017 Southeast Asian haze
* 2019 Southeast Asian haze
* 2023 Southeast Asian haze

## Effects

Haze related damages can be attributed to two sources: the haze causing fire and the haze itself. Each of the two factors can create significant disruption to people's daily lives and affect people's health. As a whole the recurring haze incidents affected regional economy and generated contention between governments of nations affected.

### Direct fire damage

Haze fires can cause many kinds of damage that are local as well as transboundary. These include loss of direct and indirect forest benefits, timber, agricultural products and biodiversity. The fires also incur significant firefighting costs and carbon release to the atmosphere.[26]

Forest fires that contribute to haze are a part of deforestation in Indonesia and Malaysia, a major environmental issue.[27]

### Economy

Some of the more direct damage caused by haze includes damage to regional tourism during haze periods, as flights have to be cancelled or delayed during particularly severe events.[7] The haze also leads to industrial production losses, airline and airport losses, damage to fisheries, and incurs the costs on cloud seeding. In addition, severe haze weather can lead to reduced crop productivity, accidents, evacuations, and the loss of confidence of foreign investors.[26]

The 1997 Southeast Asian haze is thought to have led to US$9bn in damages across ASEAN[10] whilst the 2015 haze cost Indonesia alone an estimated $16bn.[28]

### Education

School closures have affected many parts of Malaysia, Singapore and Indonesia, sometimes for several weeks, due to hazardous air pollution.[29][30]

### Health

The health effects of haze depend on its severity as measured by the Pollutants Standards Index (PSI). Levels above 100 are classified as unhealthy and anything above 300 as hazardous.[28] There is also individual variation regarding the ability to tolerate air pollution. Most people would at most experience sneezing, running nose, eye irritation, dry throat and dry cough from the pollutants.

However, persons with medical conditions like asthma, chronic lung disease, chronic sinusitis and allergic skin conditions are likely to be more severely affected by the haze and they may experience more severe symptoms. Children and the elderly in general are more likely to be affected.[3] For some, symptoms may worsen with physical activity.[31] One study linked the haze to increased lung cancer diagnoses in Malaysia.[32]

The transboundary Southeast Asian haze has been linked to various cardiovascular conditions including acute ischemic stroke,[33] acute myocardial infarction[34] and cardiac arrest.[35] These studies found dose-dependent effect of PSI on the risk of development these conditions. There appears to be increased susceptibility amongst the elderly and those with history of heart disease and diabetes mellitus.[35] The risk is elevated for several days after exposure. PSI during periods of haze has also been correlated with all-cause mortality,[36] as well as respiratory-illnesses that presented to Emergency Departments and hospital admissions.[37]

The 1997 Southeast Asian haze is estimated to have directly led to 40,000 hospitalisations.[10] A 2016 study estimated the 2015 Southeast Asian haze may have caused around 100,000 deaths, most of which were in Indonesia;[38] the BBC estimated over 500,000 suffered from respiratory ailments in the same season.[28]

A population study found that individuals experienced mild psychological stress, which was associated with the perceived dangerous PSI level and the number of physical symptoms.[39]

### Environment

In addition to the direct burning of rainforest, the haze also harms wildlife in the region such as orangutans, birds and amphibians, by impacting their health and reproduction.[40] It has also been suggested that haze affects marine ecosystems.[41]

The haze also contributes to greenhouse gas emissions, to an extent that Indonesia's national daily emissions increased tenfold and temporarily exceeded that of China and the United States during the 2015 haze season. Deforestation in Indonesia contributed to the country being the third highest emitter in the world as of 2013.[42] Commentators have suggested Indonesia's emissions during haze seasons undermine potential efforts to reach its pledged Nationally Determined Contribution under the Paris Agreement.[7]

## Responses

Countries have responded to haze events with state of emergency declarations, cloud seeding to clear air and mobilising firefighting resources to areas being burned. The public have also been recommended to stay at home with the doors closed, and wear face masks when outside to minimise exposure to hazardous air quality.[10][29][30] During the severe 1997 haze caused primarily by forest fires in Indonesia, Malaysian Prime Minister Mahathir Mohamad announced Operation Haze, sending Malaysian firefighters to Indonesia to support the response.[citation needed]

Singapore and Malaysia continuously monitor and report air pollution levels, using the Pollutant Standards Index and Air Pollution Index, respectively.

ASEAN introduced a Transboundary Haze agreement in 2002 following the severe international impact of the 1997 haze.[43] Indonesia became the last country in ASEAN to ratify it in 2014, despite its major contribution to the issue.[44]

Singapore introduced the Transboundary Haze Pollution Act 2014, that criminalises activities overseas that contribute to haze. Implementation of the domestic act to mitigate the regional issue has been challenging, and has affected Indonesia–Singapore relations.[45][10] Singapore's investigations into individuals involved in the 2015 haze were accepted by Indonesia, on the condition that it did not violate Indonesian sovereignty.[46] Efforts have been made to introduce a similar domestic law in Malaysia, although the government shelved this in 2020.[47]

The Roundtable on Sustainable Palm Oil added "no peat" to its certification scheme in response to the link between palm oil and peat burning.[10]

## Proposed solutions

The below solutions are proposed by Dennis et al. to mitigate the direct and indirect causes of fires which result in haze.[16]

### Reduce the use of fire as a tool in land clearing

Indonesian law prohibits the use of fire to clear land for any agriculture but weak enforcement is a major issue. Many companies have also claimed that zero burning is impractical and uncompetitive given the lack of meaningful penalties for illegal burning.

### Land-use allocations and tenure

Research shows that the most common cause of fire was related to competition and conflict about land tenure and land allocation. Land-use allocation decisions made by central government agencies often overlap with the concession boundaries of local jurisdictions and indigenous communities' territories. Regional reforms are needed to resolve the resource conflicts and they offer opportunities for the regional government to reconcile decisions with those of local and customary institutions. Regional reforms should also ensure that land and resource allocations and decisions at all levels are compatible with physical site characteristics, prominently taking fire risks into account. However, Indonesia's legacy of inaccurate maps, overlapping boundaries, and a lack of technical expertise at the Provincial and District levels will make this a difficult task.

### Reduce forest degrading practices

Policies to improve land management and measures to restore ecological integrity to degraded natural forests are extremely important to reduce the incidence of repeated fires. Promoting community involvement in such rehabilitation efforts is critical for their success in reducing fire risks.

### Capacity to prevent and suppress fires

The fires in Kalimantan and Sumatra highlight the need to develop fire management systems that address concerns of specific areas. Sufficient resources must be made available to improve fire management in regions that need them, while recognising the diverse needs of different regions and the people within them.

Technology such as remote sensing, digital mapping, and instantaneous communications can help to predict, detect, and respond to potential fire crises. However, such technology should be broadly accessible, widely used, and transparently controlled before they can be effective in improving fire management in remote regions.

### Economic disincentives and incentives

In addition to effective criminal and monetary penalties for illegal burning and liability for fire damage, some policy analysts believe in the potential for economic policy reforms and market-based incentives. A combination of eco-labeling and international trade restrictions could reduce markets for commodities that posed high-fire risks in their production. The government could also provide fiscal advantages to support companies' investments in fire management.

## See also

* ASEAN Agreement on Transboundary Haze Pollution
* Asian Brown Cloud
* Chemical Equator
* Peat swamp forest
* Air pollution in Malaysia
* Environmental issues in Indonesia
* Deforestation in Indonesia
* Palm oil production in Indonesia
* Stubble burning
* Combustion of biomass

## References

1. ↑ Karthik, K R G (2017-08-10). "Understanding the Southeast Asian haze" (in en). Environmental Research 12 (8): 084018. doi:10.1088/1748-9326/aa75d5. Bibcode: 2017ERL....12h4018G.
2. ↑ "Regional Haze Action Plan". Haze Action Online. http://haze.asean.org/?page_id=213.
3. ↑ 3.0 3.1 3.2 Ramakreshnan, Logaraj; Aghamohammadi, Nasrin; Fong, Chng Saun; Awang, Bulgiba; Ahmad Zaki, Rafdzah; Wong, Li Ping; Sulaiman, Nik Meriam (2017-12-05). "Haze and health impacts in ASEAN countries: a systematic review". Environmental Science and Pollution Research 25 (3): 2096–2111. doi:10.1007/s11356-017-0860-y. ISSN 1614-7499. PMID 29209970.
4. ↑ "Why is South-East Asia's annual haze so hard to deal with?". The Economist. 2013-07-07. https://www.economist.com/blogs/economist-explains/2013/07/economist-explains-3.
5. ↑ "What causes South East Asia's haze?". 16 September 2019. https://www.bbc.com/news/world-asia-34265922.
6. ↑ 6.0 6.1 Lee, Min Kok (2015-10-02). "Haze in Singapore: A problem dating back 40 years". The Straits Times. http://www.straitstimes.com/singapore/environment/haze-in-singapore-a-problem-dating-back-40-years-ago.
7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Tacconi, Luca (2016-07-06). "Preventing fires and haze in Southeast Asia" (in en). Nature Climate Change 6 (7): 640–643. doi:10.1038/nclimate3008. ISSN 1758-6798. Bibcode: 2016NatCC...6..640T. https://www.nature.com/articles/nclimate3008.
8. ↑ Soeriaatmadja, Wahyudi (2015-10-12). "Minister blasts execs of firm that denied burning forest". The Straits Times. http://www.straitstimes.com/asia/se-asia/minister-blasts-execs-of-firm-that-denied-burning-forest.
9. ↑ Fogarty, David (2015-09-27). "Lucrative illegal market for crop land a key cause of fires: Researcher". The Straits Times. http://www.straitstimes.com/asia/se-asia/lucrative-illegal-market-for-crop-land-a-key-cause-of-fires-researcher.
10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 Mayberry, Kate. "Southeast Asia struggles to tackle haze despite long-term dangers" (in en). https://www.aljazeera.com/news/2019/10/7/southeast-asia-struggles-to-tackle-haze-despite-long-term-dangers.
11. ↑ Heil, A.; Goldammer, J. G. (1 August 2001). "Smoke-haze pollution: a review of the 1997 episode in Southeast Asia". Regional Environmental Change 2 (1): 24–37. doi:10.1007/s101130100021.
12. ↑ "Guide to the #haze in infographics". http://graphics.straitstimes.com/STI/STIMEDIA/Interactives/2015/09/haze-in-singapore/index.html.
13. ↑ Abdullah, Maizatulakma; Hamzah, Noradiva; Ali, Mohd Helmi; Tseng, Ming-Lang; Brander, Matthew (2020-02-10). "The Southeast Asian haze: The quality of environmental disclosures and firm performance" (in en). Journal of Cleaner Production 246: 118958. doi:10.1016/j.jclepro.2019.118958. ISSN 0959-6526. https://www.sciencedirect.com/science/article/pii/S0959652619338284.
14. ↑ Furlow, Bryant (2013-08-01). "Political patronage helps fuel southeast Asia's seasonal haze" (in English). The Lancet Respiratory Medicine 1 (6): 435. doi:10.1016/S2213-2600(13)70141-3. ISSN 2213-2600. PMID 24429233. https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(13)70141-3/abstract.
15. ↑ 15.0 15.1 Miettinen, Jukka; Shi, Chenghua; Liew, Soo Chin (17 June 2010). "Influence of peatland and land cover distribution on fire regimes in insular Southeast Asia". Regional Environmental Change 11 (1): 191–201. doi:10.1007/s10113-010-0131-7.
16. ↑ 16.0 16.1 Dennis, Rona A. (August 2005). "Fire, People and Pixels: Linking Social Science and Remote Sensing to Understand Underlying Causes and Impacts of Fires in Indonesia". Human Ecology 33 (4): 465–504. doi:10.1007/s10745-005-5156-z.
17. ↑ Varkkey, Helena (2013). "Patronage politics, plantation fires and transboundary haze". Environmental Hazards 12 (3–4): 200–217. doi:10.1080/17477891.2012.759524.
18. ↑ "Infographic (in Indonesian)". Tempo.co. 2003-07-14. http://www.tempo.co/read/flashgrafis/2013/07/01/552/Semaput-Tercekik-Gambut.
19. ↑ "Property Rights & Resource Governance, Indonesia". USAID. http://usaidlandtenure.net/sites/default/files/country-profiles/full-reports/USAID_Land_Tenure_Indonesia_Profile_0.pdf.
20. ↑ Carder, Reuben (2013-05-29). "Indonesian villagers think their land tenure is stronger than it actually is – study". CIFOR. http://blog.cifor.org/16596/indonesian-villagers-think-their-land-tenure-is-stronger-than-it-actually-is-study#.U3R4O_kabas.
21. ↑ Colfer, Carol; Resosudarmo, Ida Aju Pradnja (2002). "Ten propositions to explain Kalimantan's fires" in Which way forward?. Washington, D.C.: Resources for the Future. p. 315. ISBN 978-1891853456.
22. ↑ Joosten, Hans (2009). The Global Peatland CO2 Picture: peatland status and drainage related emissions in all countries of the world. Wetlands International. http://www.wetlands.org/Portals/0/publications/Report/The Global Peatland CO2 Picture_web.pdf.
23. ↑ Peatlands in Southeast Asia: A Profile. ASEAN Secretariat and Global Environment Centre. 2011. http://www.gec.org.my/view_file.cfm?fileid=2897.
24. ↑ Orlic, I.; Wen, X.; Ng, T.H; Tang, S.M (1999). "Two years of aerosol pollution monitoring in Singapore: a review". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 150 (1–4): 457–464. doi:10.1016/S0168-583X(98)01053-2. Bibcode: 1999NIMPB.150..457O.
25. ↑ Praveena, Sarva Mangala; Aris, Ahmad Zaharin (2021-12-01). "The impacts of COVID-19 on the environmental sustainability: a perspective from the Southeast Asian region" (in en). Environmental Science and Pollution Research 28 (45): 63829–63836. doi:10.1007/s11356-020-11774-0. ISSN 1614-7499. PMID 33410033. PMC 7787621. https://doi.org/10.1007/s11356-020-11774-0.
26. ↑ 26.0 26.1 Glover, David, ed (2006). Indonesia's fires and haze the cost of catastrophe (Reprint 2006 with update. ed.). Ottawa: International Development Research Centre. ISBN 978-1-55250-332-4. http://www.idrc.ca/EN/Resources/Publications/Pages/IDRCBookDetails.aspx?PublicationID=281.
27. ↑ "Indonesian wildfire disaster threatens virgin forest in Borneo" (in en-US). 2015-10-29. https://news.mongabay.com/2015/10/indonesian-wildfire-disaster-threatens-virgin-forest-in-borneo/.
28. ↑ 28.0 28.1 28.2 "Indonesia haze: Why do forests keep burning?". 16 September 2019. https://www.bbc.com/news/world-asia-34265922.
29. ↑ 29.0 29.1 "Hazardous haze chokes Southeast Asia" (in en). https://www.aljazeera.com/news/2015/10/7/hazardous-haze-chokes-southeast-asia.
30. ↑ 30.0 30.1 "Malaysia, Indonesia shut thousands of schools as haze worsens" (in en). https://www.aljazeera.com/news/2019/9/19/malaysia-indonesia-shut-thousands-of-schools-as-haze-worsens.
31. ↑ "Health Effects Of Haze". Ministry of Health Singapore. http://www.moh.gov.sg/content/moh_web/home/pressRoom/pressRoomItemRelease/1997/health_effects_of_haze.html.
32. ↑ Hassan, A.; Latif, M. T.; Soo, C. I.; Faisal, A. H.; Roslina, A. M.; Andrea, Y. L. Ban; Hassan, T. (2017-11-01). "Short communication: Diagnosis of lung cancer increases during the annual southeast Asian haze periods" (in en). Lung Cancer 113: 1–3. doi:10.1016/j.lungcan.2017.08.025. ISSN 0169-5002. PMID 29110834. https://www.sciencedirect.com/science/article/pii/S0169500217304932.
33. ↑ Ho, Andrew F. W.; Zheng, Huili; De Silva, Deidre A.; Wah, Win; Earnest, Arul; Pang, Yee H.; Xie, Zhenjia; Pek, Pin P. et al. (November 2018). "The Relationship Between Ambient Air Pollution and Acute Ischemic Stroke: A Time-Stratified Case-Crossover Study in a City-State With Seasonal Exposure to the Southeast Asian Haze Problem". Annals of Emergency Medicine 72 (5): 591–601. doi:10.1016/j.annemergmed.2018.06.037. ISSN 1097-6760. PMID 30172448.
34. ↑ Ho, Andrew Fu Wah; Zheng, Huili; Earnest, Arul; Cheong, Kang Hao; Pek, Pin Pin; Seok, Jeon Young; Liu, Nan; Kwan, Yu Heng et al. (2019-03-19). "Time‐Stratified Case Crossover Study of the Association of Outdoor Ambient Air Pollution With the Risk of Acute Myocardial Infarction in the Context of Seasonal Exposure to the Southeast Asian Haze Problem". Journal of the American Heart Association 8 (6): e011272. doi:10.1161/JAHA.118.011272. ISSN 2047-9980. PMID 31112443.
35. ↑ 35.0 35.1 Ho, Andrew Fu Wah; Wah, Win; Earnest, Arul; Ng, Yih Yng; Xie, Zhenjia; Shahidah, Nur; Yap, Susan; Pek, Pin Pin et al. (2018-11-15). "Health impacts of the Southeast Asian haze problem - A time-stratified case crossover study of the relationship between ambient air pollution and sudden cardiac deaths in Singapore". International Journal of Cardiology 271: 352–358. doi:10.1016/j.ijcard.2018.04.070. ISSN 1874-1754. PMID 30223374.
36. ↑ Ho; Zheng; Cheong; En; Pek; Zhao; Morgan; Earnest et al. (2019-12-20). "The Relationship Between Air Pollution and All-Cause Mortality in Singapore" (in en). Atmosphere 11 (1): 9. doi:10.3390/atmos11010009. ISSN 2073-4433. Bibcode: 2019Atmos..11....9H.
37. ↑ Chan, Sze Ling; Ho, Andrew Fw; Ding, Huicong; Liu, Nan; Earnest, Arul; Koh, Mariko S.; Chuah, Jolyn St; Lau, Zheng Yi et al. (February 2020). "Impact of Air Pollution and Trans-Boundary Haze on Nation-Wide Emergency Department Visits and Hospital Admissions in Singapore". Annals of the Academy of Medicine, Singapore 49 (2): 78–87. doi:10.47102/annals-acadmedsg.2019209. ISSN 0304-4602. PMID 32246709.
38. ↑ Wright, Stephen. "Study estimates 100,000 deaths from Indonesia haze" (in en). https://phys.org/news/2016-09-southeast-asian-haze-crisis.html.
39. ↑ Ho, Roger C.; Zhang, Melvyn W.; Ho, Cyrus S.; Pan, Fang; Lu, Yanxia; Sharma, Vijay K. (2014-03-19). "Impact of 2013 south Asian haze crisis: study of physical and psychological symptoms and perceived dangerousness of pollution level". BMC Psychiatry 14 (1): 81. doi:10.1186/1471-244X-14-81. ISSN 1471-244X. PMID 24642046.
40. ↑ "The impacts of haze on Southeast Asia's wildlife" (in en-US). 2015-11-19. https://news.mongabay.com/2015/11/haze-killing-the-mood-for-southeast-asias-wildlife/.
41. ↑ Jaafar, Zeehan; Loh, Tse-Lynn (2014). "Linking land, air and sea: potential impacts of biomass burning and the resultant haze on marine ecosystems of Southeast Asia" (in en). Global Change Biology 20 (9): 2701–2707. doi:10.1111/gcb.12539. ISSN 1365-2486. PMID 24604729. Bibcode: 2014GCBio..20.2701J.
42. ↑ Kwok, Yenni (2013-07-30). "The Southeast Asian Haze Is Back and Worse May Follow" (in en-US). Time. ISSN 0040-781X. https://world.time.com/2013/07/30/the-southeast-asian-haze-is-back-and-worse-may-follow/. Retrieved 2021-11-24.
43. ↑ Tacconi, Luca; Jotzo, Frank; Grafton, R. Quentin (2008-03-01). "Local causes, regional co-operation and global financing for environmental problems: the case of Southeast Asian Haze pollution" (in en). International Environmental Agreements: Politics, Law and Economics 8 (1): 1–16. doi:10.1007/s10784-007-9057-z. ISSN 1573-1553. https://doi.org/10.1007/s10784-007-9057-z.
44. ↑ "Indonesia finally ratifies Asean agreement on transboundary haze". 2015-09-24. http://www.establishmentpost.com/indonesia-finally-ratifies-asean-agreement-transboundary-haze-pollution/.
45. ↑ Lee, Janice Ser Huay; Jaafar, Zeehan; Tan, Alan Khee Jin; Carrasco, Luis R.; Ewing, J. Jackson; Bickford, David P.; Webb, Edward L.; Koh, Lian Pin (2016-01-01). "Toward clearer skies: Challenges in regulating transboundary haze in Southeast Asia" (in en). Environmental Science & Policy 55: 87–95. doi:10.1016/j.envsci.2015.09.008. ISSN 1462-9011. https://www.sciencedirect.com/science/article/pii/S1462901115300770.
46. ↑ "Indonesia draws the line on Singapore's 2015 haze investigation" (in en). https://www.thejakartapost.com/news/2020/07/01/indonesia-draws-the-line-on-singapores-2015-haze-investigation.html.
47. ↑ "Domestic Transboundary Haze Pollution Act urgently needed" (in en). https://www.thestar.com.my/opinion/letters/2020/08/11/domestic-transboundary-haze-pollution-act-urgently-needed.

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