1. The ozone molecules are attacked by chlorofluorocarbon molecules. This action causes disturbances in the ozone shield due to increased rate of ozone degradation by Chlorofluorocarbon (CFC).
2. CFCs can move upwards to reach stratosphere. Here UV rays act on them and release Cl atoms. The released Cldegrades ozone, which subsequently releasing molecular oxygen.
3. Cl atoms act as catalyst. So, they remain in the stratosphere and continue the effect of ozone degradation.
4. This results in ozone depletion. This leads to the formation of ozone hole which is a large area of thinned ozone layer. One such ozone hole was observed over the Antarctic region.
