EPA: Acid Rain
Provides information about acid rain's causes and effects, how acid rain is measured, and what is being done to solve the problem.
AirData: Access to Air Pollution Data
Provides access to annual summaries of ambient air monitoring data and air pollutant emissions estimates. Reports and maps give air pollutant concentrations.
EPA: Acid Rain Program
Goal is to achieve significant environmental and public health benefits through reductions in emissions of sulfur dioxide and nitrogen oxides, the primary causes of acid rain.