Which of the following is a secondary pollutant?

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CO2

N2O

SO2

PAN

answer is D.

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Detailed Solution

Secondary pollutants are type of pollutant that is formed in the atmosphere. These pollutants are not emitted directly from a source, such as vehicles or power plants. When primary pollutants formed from combustion processes react in the atmosphere, secondary pollutants are formed. Peroxyacetyl nitrate (PAN) and ozone are the two important secondary pollutants.

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