Ozone layer in upper atmosphere is being destroyed by:
Correct answer: A. Chlorofluorocarbons
- A. Chlorofluorocarbons
- B. SO2
- C. Smog
- D. Photochemical oxidation
Explanation
The ozone layer in the upper atmosphere is being primarily destroyed by chlorofluorocarbons (CFCs). These are synthetic compounds that release chlorine and bromine atoms when they are broken down in the stratosphere. These released atoms then catalytically destroy ozone molecules, leading to thinning of the ozone layer. Therefore, option a is correct.
This question appeared on the KMU Centralized Admission Test 2022 paper, which you can sit online with every answer explained.
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About Atmospheric Pollution
Atmospheric pollution covers harmful gases and particles released by vehicles, industries, burning fuels and natural sources. It includes carbon monoxide, sulfur and nitrogen oxides, particulate matter, smog, acid rain, the greenhouse effect and ozone depletion, along with their causes, chemical reactions, environmental effects and control methods.
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