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The major anthropogenic sources for the nitrogen precursors which become nitrate in precipitation are high temperature combustion sources, which includes power plants and automobiles. The known locations for these sources are consistent with the observed nitrate concentrations in precipitation shown in Figure 3. Nitrate concentrations are high in the Northeast, from Illinois to New York. The high values of nitrate in southern California are reasonable considering the high density of people and automobiles in this area.

A decision was made to include in the analysis only those western sites with at least 100 valid samples and those eastern sites with at least 129 valid samples. For the 180 sites meeting all of the selection criteria, the median number of valid samples was 152. Shown in Figures 2–6 are lines (isopleths) of median ion concentration or median pH. The isopleths are computer generated and include some automatic smoothing, but are very similar to hand-drawn contours. , for sulfate it is milligrams per liter of sulfate, not sulfur.

2) Sites are fairly long-term, operating for a minimum of five years and ideally for much longer. 3) Each site collects samples with the same automatic wet-dry collector. Sites are also equipped with a recording rain gage, an event recorder, a high-quality pH meter, a high-quality conductivity meter, and a scale to weigh the samples before they are sent to the laboratory. 4) Each site is serviced every Tuesday. The collecting bucket from the wet-side of the sampler is sent to the central laboratory each week.

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