There is a layer of ozone gas in the upper atmosphere at a height between 15 kilometers and 60 kilometers. This ozone layer is very important for the existence of life on earth because ozone layer absorbs most of the harmful ultra-violet radiations coming from the sun which can cause skin cancer.
The ozone forms a thick layer in Stratosphere encircling the earth that has large amount of ozone in it. Now it is found that the amount of ozone is getting depleted (reduced) due to which the ozone layer in the upper atmosphere is becoming thinner and thinner day by day.
https://www.qries.com/What-do-you-understand-by-depletion-of-ozone-layer
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