Question

What is ozone hole where it is located and how is it formed?

Answer 1

Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. ... The chlorine atoms act as a catalyst, and each can break down tens of thousands of ozone molecules before being removed from the stratosphere.

Excessive thinning of ozone layer when more than half of the ozonegas in a particular area is depleted, and harmful ultraviolet rays can pass through to reach the earth's surface.

The "ozone hole" occurs over Antarctica in the very early spring when weather conditions and a lack of sunlight which produces ozone cause the stratospheric ozone layer in this region to become very thin.

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Answer 2

Ozone hole is  well.. a hole in the ozone layer..

It is located above the Antarctica

The hole is formed due to reaction of ozone with chloroflurocarbons (CFCs) and halons{both used as coolants in ACs and in aerosol sprays}

He ozone layer gets depleted due to conversion of O3 into O2 and [O] by CFCs.