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smoke and fog are aerosols.In what way are they different?
Aerosols:  They are fine solid particles  or liquid droplets in a gas .The droplets coming out of
                 the spray  are caught in the dust particles to form   fine suspension .The chemicals
                  used in these sprays are harmful to respiratory organs .
              Example : Perfume spray and other sprays .

Smoke is nothing but fine particles of unburnt carbon produced during the combustion of coal and petrol and also wood but fog is a collection of liquid water droplets or ice crystals suspended in the air at or near the Earth's surface.