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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.

Origin of photochemical smog

First recorded in 1957; photo- + chemical
Also called oxidant smog, smog.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
photochemical smog in Medicine

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.
photochemical smog in Science

photochemical smog

[fō′tō-kĕm′ĭ-kəl]

See smog.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.