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what is smog how is classical smog different from...

Question:
What is smog? How is classical smog different from photochemical smog?

Answer:

Smog is a kind of air pollution. It is the combination of smoke and fog. There are two kinds of smog:

a) Classical smog

b) Photochemical smog

The two smog can be differentiated as follows:

Classical smog:

It occurs in a cool, humid climate.

Its components are smoke, fog, and Sulphur dioxide.

It is reducing in nature.

Photochemical smog:

It occurs in a dry, sunny climate.

Its components are PAN, acrolein, ozone, formaldehyde, and nitric oxide.

It is oxidizing in nature.

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Question:
What is smog? How is classical smog different from photochemical smog?