Progress Report

Acid Deposition

Acid deposition, commonly known as "acid rain," is a broad term referring to the mixture of wet and dry deposition from the atmosphere containing higher than normal amounts of sulfur and nitrogen-containing acidic pollutants. The precursors of acid deposition are primarily the result of emissions of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) from fossil fuel combustion; however, natural sources, such as volcanoes and decaying vegetation, also contribute a small amount.

Acid Deposition Figures

Wet Sulfate Deposition Map
Three-Year Wet Sulfate Deposition
Wet Inorganic Nitrogen Deposition Map
Three-Year Wet Inorganic Nitrogen Deposition
Regional Trends in Deposition
Regional Trends in Deposition