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Nearly 200 million tons of criteria air pollutants (sulfur dioxide, nitrogen dioxide, carbon monoxide, lead, volatile organic compounds, and particulate matter) were emitted in the United States in 1997 (U.S. Environmental Protection Agency, 1998). These and other pollutants can be returned to the earth through the processes of wet and dry atmospheric deposition. Wet deposition removes gases and particles in the atmosphere and deposits them to the Earths surface by means of rain, sleet, snow, and fog. Dry deposition is the process through which particles and gases are deposited in the absence of precipitation. In 1980, the federally supported interagency National Acid Precipitation Assessment Program (NAPAP) was established to provide broadened support for research into the causes and effects of acid deposition. Under NAPAP, the U.S. Geological Survey (USGS) was designated as the lead Federal agency for the monitoring of wet atmospheric deposition in the United States. Currently, the USGS atmospheric-deposition program provides:

Atmospheric Deposition Program of the U.S. Geological Survey