"Classic Smog" is the rich, heady mixture of fog, sulfur dioxide and coal smoke particulates that were found in London England in the early 1900's. "New Improved Smog" also known as photochemical...
Photochemical smog can occur most anywhere. London-type smog comes from factories and the burning of coal and fossil fuels, where photochemical smog comes from hydrocarbons and nitrogen oxides mixing...
Photochemical smog is composed of many different compounds, but the three major ones are ozone, PAN and VOCs (Volatile Organic Compounds).
Ozone is written as O3 and is the product of the following...