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Which of the following is not usually present as a constituent of photochemical smog?

1. Ozone
2. Acrolein
3. Peroxyacetyl nitrate
4. Chlorofluorocarbons

Correct answer: Chlorofluorocarbons

Solution

Photochemical smog contains ozone, PAN, acrolein, NOx and aldehydes. Chlorofluorocarbons are stratospheric pollutants, not smog constituents - so CFCs are the odd one out, not ozone (which is a major smog component).

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