What is photochemical smog composed of?

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Solution

Photochemical smog
Photochemical smog is a secondary pollutant formed by the reaction between primary air pollutants with some atmospheric substances in the presence of sunlight.
It is predominant in heavy traffic areas.
Photochemical smog is composed of the following three major substances:
Automobile exhausts containing nitrous oxides and hydrocarbons
Water vapor present in the atmosphere
UV radiations coming from the Sun

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