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Air Pollution: Photochemical Smog
Concepts tested here
- Components of photochemical smog
All Questions
2006 AIPMT-PRE 1 question
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Photochemical smog pollution does not contain -Photochemical smog is formed in warm, dry and sunny conditions in cities with heavy traffic.
The primary pollutants, oxides of nitrogen ($NO$, $NO_2$) and unburnt hydrocarbons from vehicle exhausts, react in the presence of sunlight.
$NO_2$ is split by sunlight to give nascent oxygen, which combines with $O_2$ to form ozone ($O_3$).
Ozone and the oxides of nitrogen react with the hydrocarbons to form secondary pollutants such as peroxyacyl nitrate (PAN), formaldehyde and acrolein.
So the main components of photochemical smog are ozone, nitrogen dioxide (and other nitrogen oxides) and PAN, which make it oxidising and irritating to the eyes and lungs.
Carbon dioxide is not a component of photochemical smog.
So photochemical smog pollution does not contain carbon dioxide.