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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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

Given California’s historic problem with smog, Congress has granted the state waivers through the years to impose stricter pollution-control measures than those of the federal government. — Alejandro Lazo, WSJ, "Trump Administration Aims to Freeze Fuel Standards, End Tougher California Rules," 2 Aug. 2018 The metaphor of shutting down the freeway — with all that smog —he said, was perfect. — Benjamin Oreskes, latimes.com, "‘You ain’t poppin’ unless you got haters’: Aspiring rapper turns L.A. commute into nightmare," 28 June 2018 Filings with the Wisconsin Department of Natural Resources show that Foxconn would be a major new source of smog-forming pollution. — Jim Newton, Lake County News-Sun, "Bush resolution urges Wisconsin to rethink environmental regulation cuts," 14 May 2018 The gas, which is more expensive and has been required since 1995, is blended to burn cleaner than traditional gas to reduce smog-forming pollutants. — Lee Bergquist, Milwaukee Journal Sentinel, "EPA dramatically narrows areas of Wisconsin that will face tougher regulations for smog," 1 May 2018 California has had the authority under the half-century-old Clean Air Act to set its own mileage under a special rule allowing the state to curb its chronic smog problem. — Tom Krisher And Ellen Knickmeyer, Fox News, "Lower fuel economy standards will save lives, Trump administration says," 1 Aug. 2018 The waiver was granted at a time when California suffered some of the worst smog problems in the country. — Megan Geuss, Ars Technica, "Report: Trump admin has plan to end California’s emissions standards power," 23 July 2018 China’s efforts to curb the smog polluting its cities and clean up its steel industry are remaking the global iron-ore market, driving billion-dollar investments by mining companies and shifting the fortunes of previously unloved pits. — Rhiannon Hoyle, WSJ, "China’s Cleanup Efforts Create Boom for South African Miner," 4 Aug. 2018 Over the next six months, Lecomte, the French swimmer, wants to show people that there’s a link between their morning routines or their takeout coffee and the plastic smog polluting millions of square miles of the world’s oceans. — Rick Noack, Washington Post, "Sharks, cold water and ‘plastic smog’: Swimmer crosses Pacific to fight pollution," 5 June 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.