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a
O2 and O3
b
O2 and N2
c
Oxides of sulphur and nitrogen
d
O3 and N2
answer is C.
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Detailed Solution
Smog is a kind of air pollution. Originally named for the mixture of smoke and fog in the air. This smog mainly caused by oxides of sulphur and nitrogen like SO2, N2O, NO, NO2, etc.