What is meant by ozone depletion?
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Ozone depletion refers to the gradual thinning and reduction of the ozone layer in the earth's stratosphere due to the release of certain harmful chemicals, especially CFCs (chlorofluorocarbons).
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Name two air pollutants which
(a) affect our health,
(b) cause acid rain,
(c) cause global warming.
Name three greenhouse gases.
Mention five causes of air pollution.
State four steps to be taken to control air pollution.