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6.3 Photochemical Smog (Formation of
photochemical smog (PS) (complex…
6.3 Photochemical Smog
Urban air
pollution
Primary pollutants:
emitted directly from a
process, either natural or
anthropogenic
anthropogenic
(major: combustion of fossil fuels)
- carbon monoxide
- carbon dioxide
- unburned hydrocarbons
- sulphur dioxide
- soot / black carbon
Also include:
- building sites
- forest fires
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Secondary pollutants:
formed when primary pollutants
undergo a variety of reactions w available
chemicals in atmosphere
examples:
- tropospheric ozone
- particulates produced from
gaseous primary pollutants
- peroxycatyl nitrate (PAN)
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