oxford english dictionary

Про 20- томов не знаю, но что-то нашлa
smog: /smɒg, smɔg/
1.smoke or other atmospheric pollutants combined with fog in an unhealthy or irritating mixture.
2.photochemical smog
 
–noun Meteorology.
air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, esp. those in automobile exhaust.
Also called oxidant smog, smo

–verb (used with object)
3.to cover or envelop with or as if with smog.
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Origin:
1900–05; sm(oke) + ( f)og 1
1905, blend of smoke and fog, formed "after Lewis Carrol's example" [Klein; see portmanteau]. Reputedly coined in ref. to London, and first attested there in a paper read by Dr. H.A. des Voeux, treasurer of the Coal Smoke Abatement Society, though he seems not to have claimed credit for coining it.

С 1905, смесь SMOKE+FOG, сформированного по примеру Льюиса Кэрролла (соединять слова парами) По общему мнению специально по отношению к Лондону, впервые появилось в статье Dr. H.A. des Voeux (казначей Общества по уменьшению угольного дыма = Coal Smoke Abatement Society), хотя кажется он не заявил право на использование сего термина.

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