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smog | National Geographic Society
Smog is air pollution that reduces visibility. The term "smog" was first used in the early 1900s to describe a mix of smoke and fog. The smoke usually came from burning coal. Smog was common in industrial areas, and remains a familiar sight in cities today.

Smog - Wikipedia
Smog is a type of intense air pollution. The word "smog" was coined in the early 20th century, and is a contraction (portmanteau) of the words smoke and fog to refer to smoky fog; its opacity, and odor.

Smog | Definition of Smog by Merriam-Webster
Smog definition is - 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. How to use smog in a sentence.

smog | Causes, Effects, & Types | Britannica
Smog, community-wide polluted air. Its composition is variable. The term is derived from the words smoke and fog, but it is commonly used to describe the pall of automotive or industrial origin that lies over many cities. The term was probably first used in 1905 by H.A. Des Voeux to describe atmospheric conditions over many British towns.

Smog - sciencedaily.com
Smog is a kind of air pollution, originally named for the mixture of smoke and fog in the air. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke...

Learn About the Causes and Effects of Smog
Smog is a mixture of air pollutants— nitrogen oxides  and volatile organic compounds—that combine with sunlight to form  ozone. Ozone can be beneficial or harmful, good or bad, depending on its location.

Causes and Effects of Smog on Our Environment- Conserve ...
Smog is a yellowish or blackish fog formed mainly by a mixture of pollutants in the atmosphere which consists of fine particles and ground-level ozone. Smog which occurs mainly because of air pollution can also be defined as a mixture of various gases with dust and water vapor. Smog also refers to hazy air that makes breathing difficult.

Bureau of Automotive Repair, State of ... - Consumer
Search for a STAR, test-and-repair, test-only, or repair-only Smog Check station.