Ans: Stratospheric pollution refers to the damaging of the ozone layer by compounds such as chlorofluorocarbons, oxides of nitrogen, etc. This ozone layer protects us and all other animals from the harmful radiations of the sun which cause skin cancer. The main reason amongst the causes of stratospheric pollution is the ozone layer depletion caused by the CFCs, which are referred to as freons. Once these CFCs are released into the atmosphere, they tend to get mixed with the already existing atmospheric gases. They reach the stratosphere eventually and get broken. Ozone is depleted faster than the rate at which it is formed.