air pollutant

https://doi.org/10.1351/goldbook.A00194
A substance, gaseous material or @[email protected] which has been introduced into the air (either by human activity or by natural processes) in sufficient concentration to produce a measurable effect on humans, animals, vegetation or materials (monuments, etc.): SO2, NO2, H2S, CO, @[email protected], etc.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2172 [Terms] [Paper]