smog

noun
\ ˈsmäg How to pronounce smog (audio) , 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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Other Words from smog

smogless \ ˈsmä-​gləs How to pronounce smogless (audio) , ˈsmȯ-​ \ adjective

Synonyms for smog

Synonyms

brume, fog, gauze, haze, mist, murk, reek, soup

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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

Sure, smog is bad in the Western Hemisphere’s largest city, where traffic jams can stretch for dozens of miles. Terrence Mccoy, Washington Post, "Smoke plunges Sao Paulo into sudden darkness, baffling the Western Hemisphere’s largest city," 20 Aug. 2019 High above the valley floor, where the notorious smog turns the surrounding hills into hazy silhouettes, the old-model compacts are popularly used as informal taxis for a place that lacks public transportation. Michael Krumholtz, Twin Cities, "As Beetle ends, iconic original thrives in Mexico City hills," 10 July 2019 Congress for decades has granted California authority to set its own, tougher mileage standards as a way of fighting the state’s chronic smog. Ellen Knickmeyer, BostonGlobe.com, "Charlie Baker among 23 governors to join Calif. in opposing Trump mileage freeze," 9 July 2019 Congress for decades has granted California authority to set its own, tougher mileage standards as a way of fighting the state’s chronic smog. Ellen Knickmeyer, The Denver Post, "Gov. Polis, 22 other governors join California in opposing Trump mileage standards," 9 July 2019 Many forests are burning, smog and smoke are observed over many populated areas. Washington Post, "Russian military called in to fight Siberian forest fires," 31 July 2019 For decades, the smog-prone state has had a waiver allowing it to set more stringent fuel-efficiency guidelines than federal law calls for. Kate Cox, Ars Technica, "Car makers, California agree to emissions rules Trump admin is trying to kill," 25 July 2019 Heat and sunshine trigger chemical reactions that produce smog. Scott Dance, baltimoresun.com, "Maryland weather: ‘Excessive heat warning’ in effect; conditions prompt event cancellations, system failure," 20 July 2019 Air quality officials also issued an ozone advisory for the South Coast Air Basin through Tuesday morning, saying that the heat will combine with atmospheric inversions to trap smog pollution close to the ground. Alex Wigglesworth, latimes.com, "Worst of Southern California heat wave and smog hit Saturday," 13 July 2019

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.

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First Known Use of smog

1881, in the meaning defined above

History and Etymology for smog

smoke + fog

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More Definitions for smog

smog

noun

English Language Learners Definition of smog

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

smog

noun
\ ˈsmäg How to pronounce smog (audio) \

Kids Definition of smog

: a fog made heavier and thicker by the action of sunlight on polluted air

smog

noun
\ ˈsmäg also ˈsmȯg\

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

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