Q.

All are primary pollutants except

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a

SO2

b

H2SO4

c

NO2

d

Particulate matter

answer is B.

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Detailed Solution

Primary air pollutants: Pollutants that are formed and emitted directly from particular sources. Examples are particulates, carbon monoxide, nitrogen oxide, and sulfur oxide, Particulate matter, Mercury, Volatile organic compounds ..etc.
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All are primary pollutants except