Which of the following is a secondary pollutant?

C O_{2}

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N_{2} O

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S O_{2}

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P A N

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Solution

The correct option is D $P A N$
Secondary pollutants are produced in the atmosphere by primary pollutants. For example, secondary pollutants are photochemical oxidants (ozone, nitrogen dioxide, sulfur trioxide).

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Among the following, the only secondary pollutant is:

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