Discussion
Which of the following pollutants are responsible for depletion of ozone layer ?
Answer: B
Ozone depletion is caused by chlorofluorocarbons.
CFCs, once used in refrigerators, air conditioners and aerosol sprays, are stable enough to reach the stratosphere. There ultraviolet light breaks them down and releases chlorine atoms, and each chlorine atom can destroy thousands of ozone molecules in a chain reaction. This is why the Montreal Protocol phased them out.
Carbon dioxide and methane are greenhouse gases linked to global warming, not ozone depletion, and carbon monoxide is a poisonous gas from incomplete combustion. Acid rain is caused by sulphur and nitrogen oxides and damages buildings, soil and lakes, not the ozone layer.
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