Photochemical smog consists of excessive amount of X, in addition to a – McqOptions

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1.	Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth X is:
A.	CO
B.	\[C{{H}_{4}}\]
C.	\[{{O}_{3}}\]
D.	\[C{{O}_{2}}\]
Answer» D. \[C{{O}_{2}}\]

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