Explanation

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.