A) \[S{{O}_{2}}\]
B) \[N{{O}_{2}}\]
C) CFCs
D) photochemical smog
Correct Answer: C
Solution :
Ozone protects us from the harmful UV-radiations from the sun. Major pollutants responsible for the depletion of ozone layer are chlorofluorocarbons, nitrogen oxides and hydrocarbons. CFCs are/widely used as coolants in air conditioners and refrigerators, cleaning solvents, aerosol propellants and in foam insulation. The threat to \[{{O}_{3}}\] is mainly from CFCs, which are known to deplete \[{{O}_{3}}\] by 14% at the current emission rate.
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