US Geological Service -- Acid Rain Data & Reports

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From this US Geological Service site http://btdqs.usgs.gov/acidrain/  you can go to a map of the US and click all the way down to any monitoring site in the country and find very specific information about the testing done at that site. You can also download isopleth maps indicating the concentrations of any of a number of various pollutants. In addition, there are numerous reports on the effects of acid rain on various areas of the country.

The US Geological Service is the lead governmental agency for the monitoring and
study of atmospheric deposition (a.k.a. acid rain, acid sleet, acid snow, etc.).