The National Acid Deposition Program/National Trends Network was established in 1978 to provide high quality data on the nation's precipitation chemistry. Establishment of the network was motivated by the growing concerns for nitrogen and sulfur air pollutants, and the subsequent acidification they caused. Interested parties are directed to the NADP/NTN web site for detailed information on the entire network, its history, and available data.

The purpose of this web page is to provide highlights of results from the Greenville, Maine NADP/NTN site high quality time series of precipitation chemical properties and hydrologic input in the largely rural, forested interior of Maine. The Greenville site is often considered the best NADP/NTN site to represent the most northeasterly rural, forested conditions within the U.S. without influence of agriculture or marine factors. The Greenville NADP/NTN site is supported by the Maine Agricultural and Forest Experiment Station at the University of Maine. Data presented here are largely derived from the Maine Agricultural and Forest Experiment Station Technical Bulletin Number 164 entitled "Precipitation Chemistry at the Greenville, Maine NADP/NTN Station 1980 - 1995" by Ivan J. Fernandez and Llew Wortman. The following are the highlights of these data.

• Time series of precipitation concentrations.
• Time series of precipitation deposition.
• Characteristics of precipitation pH.
• Characteristics of precipitation amounts.

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