What region of the US has the lowest pH value of acid rain?
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The lowest value recorded was pH 2.85, and the highest was 5.95 pH. Between 1969 and 1974, no pH reading exceeded 5.0. "Clean" rain should have a pH value somewhere between 5.3 and 5.6 pH. The difference between 5.6 pH and 7.0 pH is due to the presence of CO2, which dissolves to form carbonic acid.
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