Smog is a kind of air pollution; the word "smog" is a portmanteau of smoke and fog. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulphur dioxide. Origin of term as viewed from the World Trade Center in 1988.]]Coinage of the term "smog" is generally attributed to Dr. Henry Antoine Des Voeux in his 1905 paper, ?Fog and Smoke,? for a meeting of the Public Health Congress. The 26 July 1905 edition of the London newspaper Daily Graphic quoted Des Voeux, ?He said it required no science to see that there was something produced in great cities which was not found in the country, and that was smoky fog, orwhat was known as ?smog.?? The following day the newspaper stated that ?Dr. Des Voeux did a public service in coining a new word for the London fog.?"Smog" also appears in a Jan. 19, 1893, Los Angeles Times article and is attributed to "a witty English writer." Health effects Smog is a problem in a number of cities and continu

Source: http://en.wikipedia.org/wiki/Smog
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