Smog Definition

smŏg, smôg
A noxious mixture of fog and smoke.
Webster's New World
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.
American Heritage
A low-lying, perceptible layer of polluted air.
Webster's New World

(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.

Origin of Smog

  • Blend of smoke and fog

    From Wiktionary

  • sm(oke) (f)og

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

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