Discussion
Photochemical smog is characterised by
Answer: C
Correct answer: High ozone, formed in sunlight
Photochemical smog is an oxidising, sunlight-driven phenomenon. Oxides of nitrogen and volatile organic compounds from traffic react through radical chains to produce ozone, peroxyacyl nitrates and secondary organic aerosol, with concentrations building through the day and peaking in the afternoon downwind of the city.
It is the opposite of the older London-type smog, which was reducing rather than oxidising: high sulphur dioxide and smoke from coal burning, accumulating in cold damp stagnant conditions. Both are called smog, but their chemistry, meteorology and controls are quite different.
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