Smog
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Description
Smog is a low-lying air pollutant which causes respiratory discomfort or harm and reduces visibility.
The term is a portmanteau word combining 'smoke' and 'fog' and was believed to have been coined in the late 19th century by journalists to describe the results of London fogs combined with the result of burning cheap coal in open fireplaces and in industry. The word was revived to describe the disastrous smog in London in 1952, which directly and indirectly killed over 10 000 victims.
Today, the term is often used for the result of the photochemical reaction between volatile organic compounds and nitrogen oxides, especially in tropical and sub-tropical urban conglomerations. Particularly bad examples have been recorded in Bangkok, Cairo, Los Angeles, Mexico City, New Delhi, Teheran and elsewhere, at different times.
Detailed description
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