: 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
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
However, warmer, breezier weather helped to mitigate the smog.
—
Sophia Saifi, CNN, 4 Nov. 2024
And that pattern of expansion is resulting in the same problems — congestion, smog, water shortages, sprawl — that many residents moved there from California to escape.
—Conor Dougherty, New York Times, 17 Oct. 2024
Statewide, disadvantaged neighborhoods in the Los Angeles metro area had the highest concentrations of smog and soot.
—Lisa M. Krieger, The Mercury News, 7 Aug. 2024
Its three-stage filtration is designed to target pollutants such as smog and smoke, pet dander, hair, and other allergens.
—Toni Sutton, People.com, 28 Oct. 2024
See all Example Sentences for smog 
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Sophia Saifi, CNN, 4 Nov. 2024
And that pattern of expansion is resulting in the same problems — congestion, smog, water shortages, sprawl — that many residents moved there from California to escape.
—Conor Dougherty, New York Times, 17 Oct. 2024
Statewide, disadvantaged neighborhoods in the Los Angeles metro area had the highest concentrations of smog and soot.
—Lisa M. Krieger, The Mercury News, 7 Aug. 2024
Its three-stage filtration is designed to target pollutants such as smog and smoke, pet dander, hair, and other allergens.
—Toni Sutton, People.com, 28 Oct. 2024
See all Example Sentences for smog
Dictionary Entries Near smog
Cite this Entry
“Smog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/smog. Accessed 22 Nov. 2024.
Copy CitationKids Definition
smog
noun
ˈsmäg 
also ˈsmȯg
: a thick haze caused by the action of sunlight on air polluted especially by smoke and automobile exhaust fumes
Etymology
from smoke and fog
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