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Smog - Wikipedia
Smog is a type of severe air pollution. The word "smog" was coined in the early 20th century as a blending of the words smoke and fog to refer to smoky fog, its opacity, and odor. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in Australia from the 19th century to the mid-20th century.This kind of visible air pollution is ...

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. Today, most of the smog we see is photochemical smog.Photochemical smog is produced when sunlight reacts with nitrogen oxides and at least ...

Smog - ScienceDaily
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 ...

Smog | Definition of Smog at Dictionary.com
Smog definition, smoke or other atmospheric pollutants combined with fog in an unhealthy or irritating mixture. See more.

Illinois Car Inspection Exemptions & Requirements | DMV.ORG
Illinois SOS Car Inspection requirements. Find out what emissions and safety inspections your vehicle will need to pass before it can be registered, renewed, or sold. Learn what to do if it fails.

Illinois Emissions Testing & Smog Check - 2018 Laws ...
Smog Check Exemptions for Illinois Drivers. A vehicle will not be exempted from passing a vehicle emissions test if it falls into one of the following categories:. motorcycle, moped or a motorized bicycle; Antique, custom, street rod, or vehicle made in 1967 or earlier

Vehicle Emissions Test Location Search - illinois.gov
The mission of the Illinois EPA is to safeguard environmental quality, consistent with the social and economic needs of the State, so as to protect health, welfare, property and the quality of life.

Smog Information - California
Currently, smog inspections are required for all vehicles except diesel powered vehicles 1997 year model and older or with a Gross Vehicle Weight (GVWR) of more than 14,000 lbs, electric, natural gas powered vehicles over 14,000 lbs, motorcycles, trailers, or gasoline powered vehicles 1975 and older.. Vehicles registered in areas subject to the biennial smog certification program are required ...