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Acid deposition
The process by which emissions, chiefly sulfur and nitrogen compounds, either react with the atmosphere when deposited on earth by precipitation of snow, rain, or fog with a pH of 5.5 or below, or settle out as acidic particles or gases.
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Acid rain and our Nation's Capital [New Window]
This booklet focuses on acid rain and its impact on our Nation's capital.
On-line data and reports on acid rain, atmospheric deposition, and precipitation chemistry [New Window]
Access to map of data collection sites of the National Atmospheric Deposition Program/National Trends Network (NADP/NTN) with links to other maps and reports on wet atmospheric deposition (chemicals deposited via rain, sleet and snow).
USGS tracks acid rain [New Window]
Fact sheet on the formation of acid rain, its effects, investigations, and the program of a nationwide network of acid rain monitoring stations called the National Atmospheric Deposition Program/National Trends Network (NADP/NTN).
What is acid rain? [New Window]
General interest publication on acid rain or acid precipitation with a pH distribution map of the United States.
PDF Atmospheric Deposition Program of the U.S. Geological Survey [New Window]
Document on the federally supported interagency National Acid Precipitation Assessment Program (NAPAP) covering research on causes and effects of acid precipitation with the USGS as the lead agency for monitoring wet acid deposition.


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