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Assertion : Photochemical smog is produced by nitrogen oxides.
Reason : Vehicular pollution is a major source of nitrogen oxides.
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Reason : Vehicular pollution is a major source of nitrogen oxides.
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If both assertion and reason are true and the reason is not the correct explanation of the assertion
$\mathrm{NO}_2+\mathrm{U} . \mathrm{V}$. light $\rightarrow \mathrm{NO}+\mathrm{O}$
Atomic oxygen produced as above reacts with hydrocarbons to give a variety of free hydrocarbon radicals aldehyde, ketones, $\mathrm{O}_3$, peroxyacetyl nitrate (PAN) etc. PAN mixes with the fog and gets condensed on smoke or dust particles in the air to form a smog which is called photochemical smog.
Atomic oxygen produced as above reacts with hydrocarbons to give a variety of free hydrocarbon radicals aldehyde, ketones, $\mathrm{O}_3$, peroxyacetyl nitrate (PAN) etc. PAN mixes with the fog and gets condensed on smoke or dust particles in the air to form a smog which is called photochemical smog.
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