The transfer of substances from the air to the surface of the earth, either in wet form (rain, fog, snow, dew, frost, hail) or in dry form (gases, aerosols, particles).
Document on the federally supported interagency National Acid Precipitation Assessment Program (NAPAP) covering research on causes and effects of acid precipitation with the USGS as the lead agency for monitoring wet acid deposition.
Access to map of data collection sites of the National Atmospheric Deposition Program/National Trends Network (NADP/NTN) with links to other maps and reports on wet atmospheric deposition (chemicals deposited via rain, sleet and snow).
Sulfate deposition to high-elevation areas has decreased
here as a result of reductions in SO2 emissions. Nitrate deposition did not change, whereas ammonium deposition increased, particularly at sites near urban and agricultural areas.
Explains sources of mercury in the air, ways in which mercury is concentrated in animals, and describes how we measure deposition of atmospheric mercury, with summaries of observations.
Explains acidity and acid rain and how it affects aquatic organisms. Describes the effect of acid rain on this national park, identifying areas that are at greater or lesser risk from acid rain.
Acidified soils caused toxic aluminum in 66 percent of 565 assessed streams. Diatoms and aquatic macroinvertebrates were moderately to severely affected. These effects have not improved in areas surveyed in the early 1980s
Fact sheet on the formation of acid rain, its effects, investigations, and the program of a nationwide network of acid rain monitoring stations called the National Atmospheric Deposition Program/National Trends Network (NADP/NTN).