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

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Smog is a kind of air pollution. It is the blend of smoke and fog. There are two kinds of smog:
a) Classical smog
b) Photochemical smog

The two smogs can be differentiated as follows:

Classical smogPhotochemical smog
OccurrenceIt occurs in a cool, humid climate.It occurs in a dry, sunny climate.
ComponentsSmoke, fog and ulphurdioxide.PAN, acrolein, ozone, formaldehyde, nitric oxide.
NatureIt is reducing in natureIt is oxidizing in nature.

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