ENVS 1000U Lecture Notes - Lecture 18: Asian Brown Cloud, Tropospheric Ozone, Smog
21 Mar 2016
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Document Summary
Thin layer of gases that surrounds earth. Human activity is changing the amounts of some gases. Air pollution can come from mobile/stationary sources. Point sources = specific spots where large quantities of pollutants are discharged (power plants and factories) Non-point sources = more diffuse, consisting of many small sources (automobiles) Primary pollutants = directly harmful and can react to form harmful substances (soot, carbon dioxide) Secondary pollutants = form when primary pollutants interact or react with constituents or components of atmosphere (tropospheric ozone and sulfuric acid) Sources of outdoor air pollution in modern world: includes many pollutants from industrialized activities and use of fossils fuels, judged to pose especially great threats to human health. Criteria air contaminants for outdoor air: pollutants judged to pose especially great threats to human health, sulphur dioxide (so2, nitrogen dioxide (no2, ammonia (nh3, particulate matter (pm) 7: volatile organic compounds (voc or vox) tropospheric (ground-level) ozone (o3) lead (pb)
