Answer:
In the stratosphere between 20-26 kms above sea level, there exist an ozone layer, averaging 0.29 cm above equator and exceed 40 cm above poles at end of winter season. This layer protects earth Biota from harmful effect of strong UV radiation and is called ozone shield.
\[CFC,\,C{{H}_{4}}\,and\,{{N}_{2}}O\] escape units stratosphere cause and destruction of \[{{O}_{3}}\] layer, CFC, which produces 'active chlorine' in presence of UV radiation has most damaging effect. These radicals catalytically destroy ozone of oxygen.
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