U.S. Geological Survey Data and Reports on Acid Rain, Atmospheric Deposition and Precipitation Chemistry:: Information resources on acidic deposition in the United States.

Society Created to Reduce Urban Blight (SCRUB):: Nonprofit organization working to conserve and improve the region's visual environment.

National Atmospheric Deposition Program (NADP):: US federal-state-NGO cooperative effort operating a national precipitation monitoring network to observe geographic and temporal trends in acidity, mercury, and other attributes. Includes data, maps, and meeting announcements.

PPRP Atmospheric Deposition Measurement and Analysis:: Information about and from regional acid deposition monitoring programs in the Chesapeake Bay watershed (USA).

What is Acid Rain and What Causes It?:: A discussion of the causes and effects of acid rain, and possible policy solutions.

The Acid Rain Report:: Student-created site discusses the causes, effects, geographic distribution, and possible solutions for acid rain.

US EPA - Acid Rain:: Information about causes and effects, how acid rain is measured, and what is being done to solve the problem. Includes activities for students.

Acid Mine Drainage:: Information about research and outline of different treatment technologies and their effectiveness. From West Virginia University.

USGS: What Is Acid Rain?:: Commonly used to mean the deposition of acidic components in rain, snow, fog, dew, or dry particles.

Wikipedia : Acid Rain:: Acid rain is a rain or any other form of precipitation that is unusually acidic, i.e. elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals, and infrastructure through the process of wet deposition. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides which react with the water molecules in the atmosphere to produce acids. Governments have made efforts since the 1970s to reduce the rel