Ozone hole is a region of exceptionally depleted ozone in the stratosphere of the ozone layer in high altitudes i.e.., the Antarctic, chiefly in winter, attributed to the chemical action of CFCs andother atmospheric pollutants (like aerosol sprays and plastic foams) resulting in an increase in ultraviolet rays at ground level (ex: southern Australia) which gives rise to an increased risk of skin cancer. Generally, ozone hole is defined as the area having less than 200 – 220 Dobson units (DU) of ozone in the overhead column (i.e. between the ground and the space).