Abstract
About 20% of each of the emitted SO 2 and NO x are wet-deposited as sulfate and nitrate ions over the northeastern U.S.A. This leads to a mean regional precipitation acidity of 67 μmol ℓ −1 (pH = 4.2), in good agreement with observation. Assuming a constant emission/deposition ratio, the average rain acidity can be predicted for various emission reduction scenarios.
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