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photochemical smog

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noun Meteorology.
  1. 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.
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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. 2018

photochemical smog in Medicine

photochemical smog

n.
  1. Air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants.
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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-kĕmĭ-kəl]
  1. See smog.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.