Residence time

Residence time is the average time that a molecule of a substance stays in a given area. Residence time of species X is defined as the ratio of the mass X in the area to its removal rate.[1]

In atmospheric chemistry, residence time is also called lifetime. It can be used to describe how long pollutants stay in the atmosphere.[1]

## References[edit]

1. ↑ 1.0 1.1 Jacob, Daniel J. Introduction to Atmospheric Chemistry Princeton University: 1999