Which of the following is a secondary air pollutant?
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a
PAN
b
SO2
c
Nitrogen oxide
d
CO2
answer is A.
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Detailed Solution
PAN is a secondary pollutant, which means they are not directly emitted as exhaust from power plants or internal combustion engines, but they are formed from other pollutants (nitrogen oxide and hydrocarbons) by chemical reactions in the atmosphere.