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The ozone in the ozone layer is said to be depleting the most at the poles itself.Though there is no population there and no industries but still the max depletion is said to be there. It is because of a no. of reasons:

1) The CFC's which are released over the regions of the mid latitudes are carried by the westerlies or the westerly winds which flow from the equator to the poles. On their way they carry most of the CFC'r which come their way and thus making them active only at the poles.

2) The temperature required for the depletion of ozone is very low. Actually the phenomenon of the ozone depletion is carried on the polar stratospheric clouds or PSC's which exist only at very low temperatures. These polar stratospheric clouds act as a base for all the ozone depleting reactions. And the temperature required for the formation of these PSC's is only acquired at the poles thus making the place suitable for the depletion of ozone.

Thus these factors re the ones that contribute towards the formation of ozone hole on the poles.

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