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severe air pollution

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About smog

Smog, or smoke fog, is a type of intense air pollution. The word "smog" was coined in the early 20th century, and is a portmanteau of the words smoke and fog to refer to smoky fog due to its opacity, and odour. The word was then intended to refer to what was sometimes known as pea soup fog, a familiar and serious problem in London from the 19th century to the mid-20th century, where it was commonly known as a London particular or London fog. This kind of visible air pollution is composed of nitrogen oxides, sulfur oxide, ozone, smoke and other particulates. Smog is derived from coal combustion emissions, vehicular emissions, agricultural emissions, industrial emissions, forest fires and the photochemical reaction products of these emissions.

Facts from Wikidata (CC0). Image by Tomskyhaha via Wikimedia Commons (CC BY-SA 4.0).

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