National Atmospheric Deposition Program

The National Atmospheric Deposition Program (NADP) was organized in 1977 for long-term monitoring of atmospheric chemical deposition. The NADP operates three networks that monitor precipitation chemistry at more than 300 sites. It is a cooperative program receiving support from federal, state, and local government agencies; Native American organizations; State Agricultural Experiment Stations; universities; and non-governmental organizations. The NADP Program Office and Central Analytical Laboratory are housed at the Illinois State Water Survey. The NADP website, offers downloadable data on atmospheric mercury, nitrogen and more from monitoring sites across the U.S.

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