What are the causes of wet smog in large cities?

1) Wet smog is a combination of fog with an admixture of smoke and gas waste.
2) The reason is wet, calm weather. OR, the smog is usually observed in light wind or calm. OR, most often formed on calm nights in winter, sometimes during the day.
3) As a result of intense heat radiation from the earth’s surface, it cools both itself and the adjacent layer of air containing a large percentage of pollutants, dust and smoke.

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