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photochemical smog


from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. air pollution caused by photochemical reactions involving hydrocarbons, nitrogen oxides and other pollutants, especially in still air over cities


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