Smog is a
combination of smoke and fog. There are two types of smog:
(a) Classical smog occurs in cool humid climate. It is a
mixture of smoke, fog and sulphur dioxide. Chemically, it is a reducing
(b) Photochemical smog occurs in warm, dry and sunny
climate. It is formed by the action of sunlight on unsaturated hydrocarbons and
nitrogen oxides. Chemically, it is an oxidising mixture. It does not involve
any smoke or fog.
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