Photochemical smog is the result of a chemical reaction between sunlight and air pollutants, which create ground level ozone and peroxyacytyl nitrate (PAN).
Nitrogen oxides and Volatile Organic Compounds are the air pollutants that create ozone and PAN. Nitrogen oxides are molecules made of oxygen and nitrogen atoms (Nitric Oxide and Nitric Dioxide). VOCs are molecules that include Carbon, which is why they are considered ‘organic’; these include hydrocarbons (hydrogen and carbon) and oxygenates (oxygen, hydrogen and carbon).
It can include any of the following pollutants: Aldehyde, Nitrogen oxide, Peroxyacyl nitrates, and Tropospheric ozone.
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