Which of the following is/are responsible for the depletion of the ozone layer in the
atmosphere?
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A.
Chlorofluorocarbons
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B.
Hydrofluorocarbons
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C.
Methane
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D.
Ethane
Correct Answer:
A. Chlorofluorocarbons
Explanation:
The primary cause of ozone layer depletion is the release of man-made chemicals known as ozone-depleting substances (ODS), which contain chlorine and bromine. Chlorofluorocarbons (CFCs) are the most significant contributors; when they reach the stratosphere, ultraviolet radiation breaks them down, releasing chlorine atoms that catalyze the destruction of ozone molecules. While hydrofluorocarbons (HFCs) were introduced as replacements for CFCs because they do not deplete the ozone layer, they are potent greenhouse gases that contribute to climate change. Other substances like nitrogen oxides, methane, and carbon tetrachloride also play roles in atmospheric chemistry, but CFCs remain the most rated cause of stratospheric ozone thinning. Based on the options provided, chlorofluorocarbons are the specific agents responsible for this environmental issue.
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