Ozone Hole
There is a thick layer of ozone gas which is placed in the upper atmosphere and acts as a protection for the harmful ultra-violet rays.

Due to the ozone layer is present in the upper atmosphere preventing the majority of the ultra-violet radiations coming from the sun.
https://www.qries.com/What-do-you-understand-by-the-Ozone-hole/answer/Daneel-Yunus
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