Acid Precipitation in the Northeastern United States: pH and Acidity

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Science  12 Nov 1976:
Vol. 194, Issue 4266, pp. 722-724
DOI: 10.1126/science.194.4266.722


Detailed chemical analyses reveal that acid precipitation (pH < 5.6) in the northeastern United States is caused by the strong mineral acids sulfuric and nitric. There is a large array of other proton sources in precipitation, weak acids and Bronsted acids; however, although these other acids contribute to the total acidity of precipitation, they have a minimal influence on the free acidity (ambient pH) of acid precipitation.