Freshwater Umbrella - Research programme of applied science projects to aid DEFRA make policy decisions concerned with air pollution, acid rain, and the effects on freshwater systems in the UK.
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.
UK Acid Waters Monitoring Network - Monitors the ecological impact of acid deposition in areas of the United Kingdom believed to be sensitive to acidification.
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.
US EPA Acid Rain Program - About EPA efforts reduce electric utilities' emissions of sulfur dioxide and nitrogen oxides, the pollutants responsible for acid deposition. The program includes a system of tradable SO2 emissions allowances.
