Which of the following is a primary air pollutant?
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A.
Nitrogen trioxide
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B.
Ozone
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C.
Sulphur trioxide
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D.
Sulphur dioxide
Correct Answer:
D. Sulphur dioxide
Explanation:
Sulphur dioxide is a primary air pollutant because it is emitted directly into the atmosphere from identifiable sources, such as the combustion of sulfur-containing fossil fuels in power plants and industrial factories. Unlike secondary pollutants, which form through chemical reactions between other substances already present in the air, primary pollutants like sulphur dioxide pose health and environmental risks in their original, unmodified form. Other options, such as ozone and sulphur trioxide, are categorized as secondary pollutants because they are created by atmospheric reactions involving primary emissions and environmental factors like sunlight or water vapor.
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