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Which of the following is a secondary pollutant?

1. CO
2. CO2
3. PAN
4. Aerosol

Correct answer: PAN

Solution

PAN (peroxyacetyl nitrate) is a secondary pollutant because it is not emitted directly; it forms in the atmosphere through photochemical reactions involving nitrogen oxides and hydrocarbons. CO and CO2 are primary pollutants, and aerosol is a broad category that can be primary or secondary.

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