Main Entry:

smog

Pronunciation:

\ˈsmäg, ˈsmȯg\

Function:

noun

Etymology:

smoke + fog

Date:

1884

: a fog made heavier and darker by smoke and chemical fumes ; also : a photochemical haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen especially from automobile exhaust

— smog·less \ˈsmä-gləs, ˈsmȯ-\ adjective