Chlorofluorocarbons such as freon etc. present in the stratosphere are involved in the chemical reaction with ozone. These are of free radical nature and carried in the presence of U.V. radiations.
`CI_(2)F_(2)overset((U.V.radiations))(to)overset(.)CI+overset(.)(C)CIF_(2)`
Freon
`overset(.)(C)I+O_(3)rightarrowCIoverset(.)O+O_(2)`
`CIoverset(.)O+overset(.)Orightarrowoverset(.)CI+O_(2)`
Since ozone takes part in the chemical reaction, there is a gradual depletion of ozone layer which is taking place.
