Smog meaning

smŏg, smôg
Smog is a mix of fog and smoke, or a layer of polluted air.

An example of smog is a low-lying yellow or brown layer of air.

noun
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Fog that has become mixed and polluted with smoke.
noun
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A form of air pollution produced by the photochemical reaction of sunlight with hydrocarbons and nitrogen oxides that have been released into the atmosphere, especially by automotive emissions.
noun
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(archaic) A noxious mixture of fog and smoke.
noun
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A low-lying, perceptible layer of polluted air.
noun
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A form of air pollution produced by the reaction of sunlight with hydrocarbons, nitrogen compounds, and other gases primarily released in automobile exhaust. Smog is common in large urban areas, especially during hot, sunny weather, where it appears as a brownish haze that can irritate the eyes and lungs. Ozone, a toxic gas that is not normally produced at lower atmospheric levels, is one of the primary pollutants created in this kind of smog.
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Fog that has become polluted with smoke and particulates, especially from burning coal.
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A noxious mixture of particulates and gases that is the result of urban air pollution.
noun
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(informal) To get a smog check; to check a vehicle or have it checked for emissions.

If the car is more than five years old, you'll have to have it smogged before you can register it.

verb
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Origin of smog

  • sm(oke) (f)og

    From American Heritage Dictionary of the English Language, 5th Edition

  • Blend of smoke and fog

    From Wiktionary