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.
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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.
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
External quality-assurance programs managed by the U.S. Geological Survey in support of the National Atmospheric Deposition Program/National Trends Network
Expanding the mercury deposition network in Virginia and the U.S. mid-Atlantic region
Contribution of atmospheric deposition to pesticide loads in surface water runoff
External quality-assurance results for the national atmospheric deposition program/national trends network, 2000-2001
Nitrogen emissions along the Colorado Front Range: Response to population growth, land and water use change, and agriculture
Atmospheric deposition of nutrients, pesticides, and mercury in Rocky Mountain National Park, Colorado, 2002
External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network, 1997-99
Evaluation of OTT PLUVIO Precipitation Gage versus Belfort Universal Precipitation Gage 5-780 for the National Atmospheric Deposition Program
Evaluation of candidate rain gages for upgrading precipitation measurement tools for the National Atmospheric Deposition Program
Evaluation of OTT PLUVIO Precipitation Gage versus Belfort Universal Precipitation Gage 5-780 -- supplemental data, January 15 through July 16, 2002
Diazinon and chlorpyrifos loads in precipitation and urban and agricultural storm runoff during January and February 2001 in the San Joaquin River basin, California
Rocky Mountain snowpack chemistry network: History, methods, and the importance of monitoring mountain ecosystems
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.
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.