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acid fog

noun

Definition of acid fog 

: fog having increased acidity caused by environmental factors (such as atmospheric pollutants) Even so, a combination of acid fog and ozone may have made trees on this and other Eastern summits more vulnerable to bugs, weather, and drought.— Edmund Faltermayer, Fortune, 17 July 1989

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First Known Use of acid fog

1878, in the meaning defined above

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The first known use of acid fog was in 1878

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