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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Merriam-Webster unabridged
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Time Traveler for acid fog
The first known use of acid fog was in 1878
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