_ is a secondary pollutant.
Correct answer: C. PAN
- A. CO
- B. CO2
- C. PAN
- D. NO2
Explanation
A secondary pollutant is not emitted directly but forms in the atmosphere when primary pollutants react. Peroxyacetyl nitrate (PAN) is a key component of photochemical smog, formed from the reaction of hydrocarbons and nitrogen oxides in the presence of sunlight.
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