Discuss various types of smog.

Explanation

There are two type of smog as given below:
i) Classical smog: This smog is a mixture of smoke, fog and sulphur dioxide. Chemically, it is a reducing mixture and also called as reducing smog, It occurs in cool, humid climate.
ii) Photochemical smog: This smog is formed by action of sunlight on unsaturated hydrocarbons and nitrogen oxides. It occurs in warm, dry and sunny climate.