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The extensive depletion of ozone layer o...

The extensive depletion of ozone layer occurs in the months of September to October. Explain this phenomenon.

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In Antarctica, during the months (March to August) just before the advent of spring season (September-October), the temperature drops below `-90^(@)C` . As a result, the water vapour in the atmosphere condenses to form polar stratospheric clouds. Different oxides of nitrogen which are floating in the atmosphere produce nitric acid `(HNO_(3))` in contact with the crystals of ice in the cloud. In this condition, chlorine derived from the chlorofluorocarbon (CFC) compounds does not find any opportunity to become inert by reaction with the oxides of nitrogen because chlorine is not capable to react with the nitric acid. In consequence of this phenomenon, during the few months from March to August (when the sky in the Antarctica remains covered with darkness) chlorine keeps on accumulating in the stratosphere. Then, with the arrival of spring, the chlorine present in the atmosphere becomes very reactive in the presence of sunlight and triggers the process of breaking of ozone `(O_(3))` molecules in ozone layer.
Thus, extensive depletion of ozone layer takes place in the months of September to October.
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