The photochemical smog does not generally contain :
NO2
SO2
Photochemical smog contains:
Ozone, nitric oxide, organic compounds, nitrogen dioxide, formaldehyde.
∴ SO2 is not the part of photochemical smog.
Some reactions of $NO _2$ relevant to photochemical smog formation are
Identify $A , B , X$ and $Y$
There is a number of factors that contribute to the pollution of the environment. Some of the major causes of atmospheric pollution are given below -