smog

\ 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 Farmers say the new farm equipment can help combat smog, but note that crop burning produces only a small share of the province’s pollution. — Rina Saeed Khan, The Christian Science Monitor, "In Pakistan, a 'Happy' solution to curb crop burning takes off," 8 Dec. 2020 The year’s dirty air marks the latest setback to efforts to reduce smog in the nation’s most polluted region. — Tony Barboza Staff Writer, Los Angeles Times, "L.A. began 2020 with a clean-air streak but ended with its worst smog in decades," 6 Dec. 2020 The raging coronavirus epidemic, with more than 400,000 cases in the city of 20 million people, has also heightened alarm over the smog. — Reuters, CNN, "Northern India chokes on toxic smog day after Diwali festival," 15 Nov. 2020 Because Daniel had severe asthma that was agitated by the smog in L.A., Tauber moved his family in 1969 to Pacific Beach, which was then known for its clean air. — San Diego Union-Tribune, "On Veterans Day, three local war vets reflect on service, sacrifice," 11 Nov. 2020 The smog choking Katmandu Valley had kept me from my first glimpse of the Himalayas. — Los Angeles Times, "Behind the story: From Nepal to Saudi Arabia, reporting how a dead man came back to life," 28 Oct. 2020 The burning of crop residues is seen as a major contributor to the smog that shrouds most of north India during winter months, raising the risk of heart and lung diseases and harming the country’s economy. — Rajesh Kumar Singh, Bloomberg.com, "Dubai Firm Trains Sight on India’s Deadly Winter Smog Problem," 9 Oct. 2020 Each autumn, when temperatures fall and wind speeds drop, a polluted smog settles over the city. — Washington Post, "India’s capital is battling a surge in coronavirus cases just as pollution levels spike," 15 Nov. 2020 The country is pushing for expansion of the dirtiest fossil fuel as a deadly winter smog, partly caused by coal burning, envelops its northern plains. — Rajesh Kumar Singh, Bloomberg.com, "Two India Billionaires Win in Landmark Government Coal Auctions," 2 Nov. 2020

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.