The National Atmospheric Deposition Program (NADP) is a collaboration of atmospheric monitoring networks. The purpose of the networks is to collect data to evaluate air quality. Network data also inform science-based actions to protect human health and preserve ecosystems for current and future generations.
The NADP National Trends Network (NTN) quantifies the concentration of eight major ions and acidity present in precipitation samples for 250 sites across the United States. The Mercury Deposition (MDN), Ammonia Monitoring (AMoN), Atmospheric Mercury (AMNET), and Mercury Litterfall (MLN) Networks comprise the other NADP networks.
The USGS has been an NADP partner agency since 1981 and participates by providing funds for 69 NTN sites. USGS also funds one MDN and one MLN site.
Quick Links
USGS supports monitoring sites within the National Trends Network, Mercury Deposition Network, and Mercury Litterfall Network of the National Atmospheric Deposition Program.
Data from the NADP networks are used to track trends and examine spatial patterns in atmospheric deposition of chemical elements that include nitrogen, sulfur, mercury, calcium, and others. Many of these chemical elements are naturally present in the atmosphere but also originate in part as air pollutant emissions from human activities including power plants and vehicles.
Policies implemented under the Clean Air Act, as part of global treaties, and by other regulations typically set targets for reducing emissions. Changes in air pollutant emissions are tracked by NADP measurements. Therefore, there is a close link between science, policy, and management at the heart of the NADP.
![Photo of five scientists working at a remote, mountain field site. One scientist is examining sample collection equipment.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/media/images/CO98_Aug10_2010%20014.jpg?itok=pjfklbu2)
Site operators collect samples following approved methods. The NADP Analytical Laboratory (NAL) analyzes the samples using consistent methods. This facilitates comparisons across sites and ensures consistent data for evaluation of long-term trends in deposition chemistry.
The USGS participation in the NADP is funded by the National Water Quality Program.
Annual gradient maps
Since 1985, the NADP has created annual gradient maps of precipitation-weighted mean concentrations and deposition for several different chemical elements.
► More about the NADP data, program, and networks
Below are data associated with National Atmospheric Deposition Program (NADP).
Scientists use National Atmospheric Deposition Program (NADP) data to investigate nitrogen sources to watersheds and estuaries, ecosystem effects of pollutant deposition, and results of implementation of clean air policies.
Atmospheric Deposition Program of the U.S. Geological Survey
Uses of National Atmospheric Deposition Program/National Trends Network data for science education and environmental problem solving, November 27, 1995 to February 10, 1997
External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1994
Nitrogen fluxes in a high elevation Colorado Rocky Mountain basin
Hydrologic and water-quality data for two small watersheds on Catoctin Mountain, North-Central Maryland, 1987-93
Hydrologic and geochemical factors affecting the chemistry of small headwater streams in response to acidic deposition on Catoctin Mountain, north-central Maryland
Trends in precipitation chemistry in the United States, 1983-94; an analysis of the effects of Phase I of the Clean Air Act Amendments of 1990, Title IV
U.S. Geological Survey Nitrogen-Cycling Workshop: Denver, Colorado October 30 - November 2, 1995
Snowpack chemistry at selected sites in northwestern Colorado during spring 1995
Trends in the chemistry of precipitation and surface water in a national network of small watersheds
External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1991
Pesticides in the atmosphere; distribution, trends, and governing factors
The National Atmospheric Deposition Program (NADP) is a collaboration of atmospheric monitoring networks. The purpose of the networks is to collect data to evaluate air quality. Network data also inform science-based actions to protect human health and preserve ecosystems for current and future generations.
The NADP National Trends Network (NTN) quantifies the concentration of eight major ions and acidity present in precipitation samples for 250 sites across the United States. The Mercury Deposition (MDN), Ammonia Monitoring (AMoN), Atmospheric Mercury (AMNET), and Mercury Litterfall (MLN) Networks comprise the other NADP networks.
The USGS has been an NADP partner agency since 1981 and participates by providing funds for 69 NTN sites. USGS also funds one MDN and one MLN site.
Quick Links
USGS supports monitoring sites within the National Trends Network, Mercury Deposition Network, and Mercury Litterfall Network of the National Atmospheric Deposition Program.
Data from the NADP networks are used to track trends and examine spatial patterns in atmospheric deposition of chemical elements that include nitrogen, sulfur, mercury, calcium, and others. Many of these chemical elements are naturally present in the atmosphere but also originate in part as air pollutant emissions from human activities including power plants and vehicles.
Policies implemented under the Clean Air Act, as part of global treaties, and by other regulations typically set targets for reducing emissions. Changes in air pollutant emissions are tracked by NADP measurements. Therefore, there is a close link between science, policy, and management at the heart of the NADP.
![Photo of five scientists working at a remote, mountain field site. One scientist is examining sample collection equipment.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/side_image/public/media/images/CO98_Aug10_2010%20014.jpg?itok=pjfklbu2)
Site operators collect samples following approved methods. The NADP Analytical Laboratory (NAL) analyzes the samples using consistent methods. This facilitates comparisons across sites and ensures consistent data for evaluation of long-term trends in deposition chemistry.
The USGS participation in the NADP is funded by the National Water Quality Program.
Annual gradient maps
Since 1985, the NADP has created annual gradient maps of precipitation-weighted mean concentrations and deposition for several different chemical elements.
► More about the NADP data, program, and networks
Below are data associated with National Atmospheric Deposition Program (NADP).
Scientists use National Atmospheric Deposition Program (NADP) data to investigate nitrogen sources to watersheds and estuaries, ecosystem effects of pollutant deposition, and results of implementation of clean air policies.