Answer:
Option D
Explanation:
A-II,B-I,C-IV,D-III
(A) , $SO_{2}$ Acid rain is caused by chemical reaction that begins when compounds like sulphur dioxide and nitrogen oxides are released into the air. There amount can rise very high into the atmosphere, where they mix and react with water , oxygen and other chemicals to form more acidic pollutants, known as acid rain
(B) Photochemical smog is a mixture of air pollutants that have been chemically altered into further noxious compounds by exposure to sunlight. The main compounds of photochemical smog are nitrogen oxides, volatile organic compounds, tropospheric ozone and PAN(peroxy Acetyl nitrate)
(C) Smoke smoke is a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion
(D) $CF_{2}Cl_{2}, CFCs$ (chlorofluorocarbons ), oxides of nitogen are startospheric pollutants.
