Nitric oxide (NO) is the nucleus of photochemical smog. \[ \begin{array}{l} 2 \mathrm{NO}(\mathr....
0Nitric oxide (NO) is the nucleus of photochemical smog.
\( \mathrm{P} \)
\[
\begin{array}{l}
2 \mathrm{NO}(\mathrm{g})+\mathrm{O}_{2}(\text { air }) \rightarrow 2 \mathrm{NO}_{2}(\mathrm{~g}) \\
\mathrm{NO}_{2}(\mathrm{~g}) \text { sunlight } \mathrm{NO}(\mathrm{g})+[\mathrm{O}] \\
{[\mathrm{O}]+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{O}_{3}(\mathrm{~g})}
\end{array}
\]
Both \( \mathrm{NO}_{2} \) and \( \mathrm{O}_{3} \) are strong oxidising agents and react with unburnt hydrocarbons in the polluted air to produce formaldehyde, acrolein and peroxyacetyl nitrate (PAN). These products are harmful to the plant and animal life. Catalytic converters are now installed in the automobiles to reduce the photochemical smog. Photochemical smog can also be suppressed by certain compounds, which act as free radical trap.
Photochemical smog formed in congested metropolitan cities mainly consist of:
(1) hydrocarbons, \( \mathrm{SO}_{2} \) and \( \mathrm{CO}_{2} \)
(2) hydrocarbons, ozone and \( \mathrm{SO}_{2} \)
(3) ozone, peroxyacetyl nitrate and \( \mathrm{NO}_{x} \)
(4) smoke, peroxyacetyl nitrate and \( \mathrm{SO}_{2} \)
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