Why the Ozone layer is broken?

When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. ... When they break down, they release chlorine or bromine atoms, which then deplete ozone.

Explanation:

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Earth's rotation cause the global convention current between the equator and the poles