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# The smog is essentially caused by presence of

$\begin{array}{1 1}(a)\;O_2\;and\;O_3&(b)\;Oxides\;of\;sulphur\;and\;nitrogen\\(c)\;O_3\;and\;N_2&(d)\;O_2\;and\;N_2\end{array}$

The smog is essentially caused by presence of oxides of sulphur and nitrogen.
Hence (b) is the correct answer.