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प्रश्न
Which of the following is secondary pollutant?
पर्याय
NO
NO2
SO2
PAN
MCQ
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उत्तर
PAN
Explanation:
Peroxyacetyl nitrate (PAN) forms in the atmosphere through photochemical reactions and is a secondary pollutant. NO and SO2 are primary pollutants; the supplied answer key identifies PAN as the correct choice.
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