The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole ?

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Q: 9 (IAS/2011)
The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole ?
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question_subject: 

Ecology

question_exam: 

IAS

stats: 

0,268,365,67,268,67,231

keywords: 

{'ozone hole': [0, 0, 1, 1], 'antarctic region': [1, 0, 0, 2], 'prominent tropospheric turbulence': [0, 0, 0, 1], 'stratospheric clouds': [0, 0, 0, 1], 'chlorofluorocarbons': [0, 0, 0, 2], 'global warming': [3, 0, 1, 0], 'methane': [0, 0, 0, 5], 'prominent polar front': [0, 0, 0, 1], 'polar region': [3, 0, 1, 4], 'polar front': [0, 0, 0, 1], 'hole': [2, 0, 1, 1]}