Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Fog that has become mixed and polluted with smoke.
  • noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A noxious mixture of particulates and gases that is the result of urban air pollution
  • verb informal To get a smog check; to check a vehicle or have it checked for emissions.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun air pollution by a mixture of smoke and fog

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[sm(oke) + (f)og.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Blend of smoke and fog

Examples

  • In general the term smog has become connected to a situation where visibility is significantly impaired as a result of local air pollution.

    Smog

  • The term smog, a contraction of smoke and fog, was introduced in 1905 by Dr. H.A. des Vœux to describe the mixture of soot, sulfuric acid, and other pollutants in emissions from coal furnaces in London.

    Smog

  • The term smog was first used in 1905 to describe the conditions of fog that had soot or smoke in it.

    Lahore Metblogs

  • The term smog was first used in 1905 to describe the conditions of fog that had soot or smoke in it.

    Bloggers.Pakistan

  • Estimating the economic cost of our addiction is difficult; direct subsidies to oil and oil using systems are often complex and artfully concealed but estimates calculate the subsidy at around $20 per barrel of oil; but what "cost" should we add for a child who develops asthma from breathing in smog?

    Robert Zevin: Addiction

  • I remember when there was real pollution, on most days Los Angeles was so covered in smog you could not see the mountains or the city skyline; trash everywhere, the smell of leaded gas filled our noses.

    Jack Schmitt on Global Warming - NASA Watch

  • Estimating the economic cost of our addiction is difficult; direct subsidies to oil and oil using systems are often complex and artfully concealed but estimates calculate the subsidy at around $20 per barrel of oil; but what "cost" should we add for a child who develops asthma from breathing in smog?

    Robert Zevin: Addiction

  • True, the smog is not quite so thick and unhealthy as in Monterrey itself, but over time will prove intolerable. jerezano

    saltillo,mexico

  • Estimating the economic cost of our addiction is difficult; direct subsidies to oil and oil using systems are often complex and artfully concealed but estimates calculate the subsidy at around $20 per barrel of oil; but what "cost" should we add for a child who develops asthma from breathing in smog?

    Robert Zevin: Addiction

  • Estimating the economic cost of our addiction is difficult; direct subsidies to oil and oil using systems are often complex and artfully concealed but estimates calculate the subsidy at around $20 per barrel of oil; but what "cost" should we add for a child who develops asthma from breathing in smog?

    Robert Zevin: Addiction

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