Acid Precipitation in the Western United States

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Science  11 Jan 1980:
Vol. 207, Issue 4427, pp. 176-177
DOI: 10.1126/science.207.4427.176


Precipitation chemistry data from a rural area at an elevation of 2900 meters near the Continental Divide in Colorado show unexpectedly low pH values for bulk precipitation. A significant downward trend in pH over the last 3 years is associated with increasing amounts of nitric acid in precipitation.