photochemical smog

noun Meteorology.
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.
Also called oxidant smog, smog.

1957; photo- + chemical Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

photochemical smog n.
air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
photochemical smog   (fō'tō-kěm'ĭ-kəl)  Pronunciation Key 
See smog.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The dark region over the sunlit pole is believed to be a high layer of photochemical smog.
The kinetics and mechanisms of the homogeneous elementary reactions involved in photochemical smog formation were investigated.
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