Question

why the ozone layer on the earth is decreasing

Answer 1

ozone layer is depleting over a long period of time because of the harmful global warming which is caused by the excessive presece of CO^2 in atmosphere.

Answer 2

The main substances which are responsible for the depletion of the ozone layer which exists in the lower part of the stratosphere are the Chlorofluorocarbons (CFCs). They are found in the compressors of ACs and refrigerators. Other ozone-destroying elements are the halogenated chemicals, for instance, Bromine and Chlorine and other man-made substances. In the recent past, scientists have observed big holes in the O3 film of Earth's atmosphere.