Ammonia, Freon (Chloro Fluoro Carbon's), Hydrogen sulphide(H2S) are some of the major air pollutants.
Ammonia is released from fertilizers.
Freon is used in the refrigerator that causes ozone depletion.
H2S gas is highly dangerous for humans and very corrosive to equipment, produced as a by-product in paper and pulp industries during the manufacturing process.