What is Smog||Smog in Lahore ||Smog Meaning in Urdu ||Smog Chemistry

What is Smog||Smog in Lahore ||Smog Meaning in Urdu ||Smog Chemistry
https://youtu.be/BU1qoOhsBqQ
Smog is a type of air pollutant. The word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog, its opacity, and odour.[1] 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. This kind of visible air pollution is composed of nitrogen oxides, sulphur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources).[citation needed] Human-made smog is derived from coal emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photochemical reactions of these emissions.

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