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2015-01-30T21:14:10+05:30

it refers to the increasing amount of CO2 in atmosphere due to which there is a hole in the ozone layer
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2015-01-30T21:14:26+05:30

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Ozone hole refers to the depletion of stratospheric ozone over the polar region. 
The ozone molecules are dissociated into oxygen by the action of free chlorine radicals in the presence of UV rays.
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