air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, especially those in automobile exhaust.
Origin of photochemical smog
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants.
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