The photochemical smog does not generally contain.

Some reactions of $NO_2$ relevant to photochemical smog formation are:
$NO_{2(g)} \xrightarrow{hv} NO_{(g)} + X$
$X + O_2 \rightarrow Y$
$NO + Y \rightarrow NO_2 + A$
$O + O_2 + M \rightarrow B + M$
Identify $A, B, X$ and $Y$.

What is the volume percentage of nitrogen gas in the atmosphere (in $\%$)?

What are the reactions involved for ozone layer depletion in the stratosphere?

How is the troposphere damaged by oxides of carbon?

The correct statement about photochemical smog is .... .