title: Acid precipitation in the Western United States.
abstract: 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.
authors.forename: W M
authors.initials: WM
authors.lastname: Lewis
authors.forename: M C
authors.initials: MC
authors.lastname: Grant