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JEE Main levelSingle correct optionDifficulty 2 of 3ev023

Which of the following is a secondary pollutant?

A $CO$ from incomplete combustion
B $NO$ from engine exhaust
COzone formed in photochemical smog
D $SO X_{2}$ from burning coal

Answer: C

Secondary pollutants are formed in the atmosphere by reactions of primary pollutants. Tropospheric ozone forms from

O

atoms (from

NO X_{2}

photolysis) and

O X_{2}

, whereas

CO

,

NO

and

SO X_{2}

are emitted directly.

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