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photochemical smog

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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Word History and Origins

Origin of photochemical smog1

First recorded in 1957; photo- + chemical
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Example Sentences

It was a Caltech professor, Arie Jan Haagen-Smit, not GM engineers or chemists, who proved in the 1950s the connection between motor vehicles and the lethal photochemical smog over the cities and suburbs of California.

This was Los Angeles’ first episode of “photochemical” smog.

“The light wind hinders effective dispersion of air pollutants. The sunshine enhances photochemical smog activities and the formation of ozone during the daytime, resulting in high pollution in the region.”

Oxidized nitrogen becomes part of photochemical smog and ozone and is a major component of the infamous PM 2.5, particulate matter less than 2.5 microns in diameter that decreases visibility and is harmful when inhaled because it can penetrate deeply into the lungs.

Cars in Tokyo cause an eye-stinging photochemical smog.

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