smog


smog

noun \ˈsmäg, ˈsmg\

: fog mixed with smoke : a cloud of dirty air from cars, factories, etc., that is usually found in cities

Full Definition of SMOG

:  a fog made heavier and darker by smoke and chemical fumes; also :  a photochemical haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen especially from automobile exhaust
smog·less \ˈsmä-gləs, ˈsm-\ adjective

Examples of SMOG

  1. <the city's smog was once so bad that darkness often prevailed, even at noon>

Origin of SMOG

smoke + fog
First Known Use: 1884

Related to SMOG

Other Climate/Meteorology Terms

monsoon, occlusion, ozone, rime, squall, zephyr

Rhymes with SMOG

smog

noun \ˈsmäg also ˈsmg\   (Medical Dictionary)

Medical Definition of SMOG

: a fog made heavier and darker by smoke and chemical fumes; also : a photochemical haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen especially from automobile exhaust

smog

noun    (Concise Encyclopedia)

Polluted air over a community. The term, a combination of “smoke” and “fog,” was popularized in the early 20th century and now commonly refers to the pall of automotive or industrial origin that lies over many cities. Sulfurous smog results from the use of sulfur-bearing fossil fuels, particularly coal, and is aggravated by dampness. Photochemical smog requires neither smoke nor fog. Nitrogen oxides and hydrocarbon vapours emitted from automobiles and other sources undergo reactions in the presence of sunlight that produce a light brownish coloration of the atmosphere, reduced visibility, plant damage, irritation of the eyes, and respiratory distress.

Browse

Next Word in the Dictionary: smoggy
Previous Word in the Dictionary: smock mill
All Words Near: smog

Seen & Heard

What made you want to look up smog? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More