Question

What is photochemical smog composed of?

Answer 1

Photochemical smog

1. Photochemical smog is a secondary pollutant formed by the reaction between primary air pollutants with some atmospheric substances in the presence of sunlight.
2. It is predominant in heavy traffic areas.

Photochemical smog is composed of the following three major substances:

1. Automobile exhausts containing nitrous oxides and hydrocarbons
2. Water vapor present in the atmosphere
3. UV radiations coming from the Sun