Explain the depression of ozone layer?

Ozone requires the following components for formation: oxygen, UV light of 215nm wavelength or shorter. Some nitrogen compounds also assist in forming ozone, even without VOCs being present.

Ozone is decreased by time, temperature, water vapor, molecules that oxidize by ozone, and molecules that catalyze ozone destruction. Water vapor also serves to block the "nitrogen assitance" path.

Any increase in destroyers of ozone, or reduction in progenitors of ozone will serve to decrease the amount of ozone present at any particular place.

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