The presence of chlorine within CFC’s break down the ozone gases in ozone layer which increases the chances of ozone depletion. Till date, CFC’s have accounted for about 80% of ozone depletion.
The destruction of the ozone layer is primarily caused when the amount of gases that contain chlorine begins to increase in the environment. As these gases rise upwards, they are exposed to UV light. This then causes a chemical reaction which creates chlorine atoms. These affect the atoms of ozone and cause ozone depletion.