The Acid rain produces by the chemical reaction which takesplace when compounds like sulphur dioxide and nitrogen oxidesare released into the air. Photochemical smog is a mixture of air pollutants that ischemically altered into further noxious compounds by exposureto sunlight. Smoke is the collection of airborne solid and liquid particulatesand gases emitted when a material undergoes combustion.CFCs oxides of nitrogen are stratospheric pollutants. CFCs oxides of nitrogen are stratospheric pollutants.