smog

noun

\ ˈsmäg ,

ˈsmȯg \

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

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Synonyms for smog

Synonyms

fog, haze, mist, murk, reek, soup

Examples of smog in a Sentence

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

Recent Examples on the Web

In Los Angeles, smog is a given and most of us know its primary source is cars and trucks. — Shelby Grad, latimes.com, "Essential California: Why the heat left so many powerless in L.A.," 10 July 2018 But in 1957, due to London’s terrible smog problem, the Observatory and its telescope relocated to a castle in Sussex, leaving the original building behind as a museum and education center. — Jason Daley, Smithsonian, "Now That the Smog Has Lifted, Astronomy Returns to London’s Royal Observatory," 28 June 2018 Motor vehicle exhaust and factory emissions are the primary sources of those pollutants — making a factory-heavy, high-traffic area like metro Detroit a major smog-maker. — Keith Matheny, Detroit Free Press, "Metro Detroit, other Michigan cities violating tighter ozone rules," 1 May 2018 This year's auto show has a heavy emphasis on electrified vehicles, for one thing, reflecting the Chinese government’s newfound focus on dealing with the country’s endemic smog problems. — NBC News, "Beijing Auto Show hints at big changes to come — for the U.S. as well as China," 27 Apr. 2018 Judges have also denied attempts to suspend methane and smog regulations on oil and gas wells, to roll back mercury pollution rules, and to reduce renewable fuels requirements. — Emily Atkin, The New Republic, "How “Effective” Is Scott Pruitt, Really?," 6 Apr. 2018 Clearly, there may be fits and starts as the world fights its smog problem. — Dave Levitan, Scientific American, "Ozone Pollution Grows, but It Can Be Fixed," 22 Feb. 2018 A year ago, tarnished automaker Volkswagen agreed to contribute $44 million to increase electric vehicle use in the capital city as part of its punishment for installing software in its diesel cars that allowed them to cheat on smog tests. — Tony Bizjak And Ryan Lillis, sacbee, "Money from Volkswagen could pay for electric shuttle between Sacramento, UC Davis | The Sacramento Bee," 8 Feb. 2018 When Brown first served as governor in the 1970s, pollution in California was so bad that millions of Californians couldn’t see the mountain tops just a few miles from their homes and Los Angeles was choking on smog. — Bloomberg.com, "Governor Moonbeam's Got One Last Fight Against Trump Left in Him," 1 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'smog.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.