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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
From the M-W Editors
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First Known Use of acid fog
1878
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