National Acid Precipitation Assessment Program Report to Congress: An Integrated Assessment [open pdf - 5MB]
This report published by the National Science Technology Council (NSTC) "presents the latest scientific information and analysis concerning the costs, benefits, and environmental effectiveness of the Acid Rain Program. This Program was mandated by Title IV of the 1990 Clean Air Act Amendments to reduce sulfur dioxide (SO2) and nitrogen oxides (NOx) emissions from electric generating sources. The SO2 program includes the use of an innovative emissions cap and trade program. Title IX of the 1990 Clean Air Act Amendments requires the National Acid Precipitation Assessment Program (NAPAP) to report to Congress the costs, benefits, and effectiveness of the Acid Rain Program and characterize what deposition reductions would be necessary to prevent adverse ecological effects in acid sensitive ecosystems. This report fulfills the requirements of Title IX. [...] Acid deposition, more commonly known as acid rain, occurs when emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) react in the atmosphere (with water, oxygen, and oxidants) to form various acidic compounds. These acidic compounds then fall to earth in either a wet form (rain, snow, and fog) or a dry form (gases, aerosols, and particles). Prevailing winds transport the acidic compounds hundreds of miles, often across state and national borders. At certain levels the acidic compounds, including small particles such as sulfates and nitrates can cause many negative human health and environmental effects."
The National Science and Technology Council: http://www.ostp.gov/cs/nstc