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The ozone depletion is actually something happening naturally. It is an ongoing process. The moment ozone was formed, its formation and depletion were the phenomenons that run parallel to each other.

However the rate of formation of ozone was same as its depletion so no frequent changes were seen in its thickness or concentration. However the water vapour was still present at that time which could deplete ozone but the factors like the CFC's or other ODS i.e. ozone depleting substances were not present at that time.

The ozone depletion and ozone formation are actually the phenomenon which were or are carried by the same high energy ultraviolet radiations. These ultraviolet radiations make the oxygen molecules present in the lower stratospheric region of the atmosphere dissociate onto two single atoms of nascent oxygen i.e. [O]. These nascent oxygen atoms individually react with the oxygen molecules to form ozone molecule. However the same Ultraviolet radiations make the ozone molecule break down into oxygen molecules. However with the start of the industrial revolution and the discovery of the CFC's the rate of depletion of ozone increased as compared to the formation rate and thus a so called ozone hole was formed in the ozone layer of the earth.

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14y ago

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