The depletion of the ozone layer in the upper atmosphere is mainly due to the emission of :
(a) unburnt hydrocarbons (b) chlorofluorocarbons
(c) greenhouse gases (d) ultraviolet radiations
(b) chlorofluorocarbons
Chlorofluorocarbons emitted by air-conditioners, refrigerators and jet planes cause the depletion of the ozone layer.