- —smogless, adj./smog, smawg/, n.1. smoke or other atmospheric pollutants combined with fog in an unhealthy or irritating mixture.2. See photochemical smog.v.t.3. to cover or envelop with or as if with smog.[1900-05; SM(OKE) + (F)OG1]
* * *Polluted air over a community.The term, a combination of "smoke" and "fog," was popularized in the early 20th century and now commonly refers to the pall of automotive or industrial origin that lies over many cities. Sulfurous smog results from the use of sulfur-bearing fossil fuels, particularly coal, and is aggravated by dampness. Photochemical smog requires neither smoke nor fog. Nitrogen oxides and hydrocarbon vapours emitted from automobiles and other sources undergo reactions in the presence of sunlight that produce a light brownish coloration of the atmosphere, reduced visibility, plant damage, irritation of the eyes, and respiratory distress.
* * *community-wide polluted air. Although the term is derived from the words smoke and fog, it is commonly used to describe the pall of automotive or industrial origin that lies over many cities, and its composition is variable (see video—>). The term was probably first used in 1905 by H.A. Des Voeux to describe atmospheric conditions over many British towns. It was popularized in 1911 by Des Voeux's report to the Manchester Conference of the Smoke Abatement League of Great Britain on the more than 1,000 “smoke-fog” deaths that occurred in Glasgow and Edinburgh during the autumn of 1909.At least two distinct types of smog are recognized, sulfurous smog and photochemical smog. Sulfurous smog results from a high concentration of sulfur oxides in the air and is caused by the use of sulfur-bearing fossil fuels, particularly coal. This type of smog is aggravated by dampness and a high concentration of suspended particulate matter in the air.Photochemical smog, which occurs most prominently in urban areas that have large numbers of automobiles, requires neither smoke nor fog. This type of smog has its origin in the nitrogen oxides and hydrocarbon vapours emitted by automobiles and other sources, which then undergo photochemical reactions in the lower atmosphere. The highly toxic gas ozone arises from the reaction of nitrogen oxides with hydrocarbon vapours in the presence of sunlight, and some nitrogen dioxide is produced from the reaction of nitrogen oxide with sunlight. The resulting smog causes a light brownish coloration of the atmosphere, reduced visibility, plant damage, irritation of the eyes, and respiratory distress.
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smog — smog … Dictionnaire des rimes
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 caused by a mixture of smoke and sulfur dioxide. Modern smog does not usually come from coal but from… … Wikipedia
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smog — s.n. Ceaţă deasă, amestecată cu fum şi cu praf industrial, formată în regiunile industrializate sau în marile oraşe, cu efecte dăunătoare asupra sănătăţii populaţiei. – Din engl. smog. Trimis de RACAI, 07.12.2003. Sursa: DEX 98 smog s. n.… … Dicționar Român
smog — [ smɔg ] n. m. • 1905; mot angl., de smoke « fumée » et fog « brouillard » ♦ Anglic. Brouillard épais formé de particules de suie et de gouttes d eau, dans les régions humides et industrielles. ● smog nom masculin (anglais smog, de smoke, fumée,… … Encyclopédie Universelle
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smog — smòg s.m.inv. CO coltre di nebbia densa e scura costituita da vapore acqueo misto a fumi e altri residui di combustione, che ristagna spec. sui grandi centri urbani o industriali: lo smog inquina l aria delle grandi città, prendere provvedimenti… … Dizionario italiano
smog — smog·gy; an·ti·smog; smog·less; smog; … English syllables
smog — smȍg m DEFINICIJA ekol. 1. magla s visokim stupnjem onečišćenja od industrijskih emisija i automobilskih ispušnih plinova 2. meton. zagađenje zraka proizvodima izgaranja SINTAGMA fotokemijski smog smog koji je nastao oksidacijom hidrougljika,… … Hrvatski jezični portal
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Smog — der; [s], s <aus gleichbed. engl. smog, zusammengezogen aus smoke »Rauch« u. fog »Nebel«> dicke, undurchdringliche, aus Rauch u. Schmutz bestehende Dunstglocke über Industriestädten … Das große Fremdwörterbuch