Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?

Which of the following emissions in the exhaust gas of an I.C. engine

1.	Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?
A.	Nitrogen oxides
B.	Hydrocarbons
C.	Both A. & B.
D.	Carbon monoxide
Answer» D. Carbon monoxide

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Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?

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