NWDTW 2024

The USGS-National Atmospheric Deposition Program (NADP) has been an NADP partner agency since 1981. USGS is one of many Federal and State agencies of the National Trends Network (NTN) and provides funding for 82 out of a total of 263 NTN sites, the largest Federal funding contributor of all participating agencies. Weekly precipitation samples are collected and shipped to a central laboratory that analyzes the amount and type of atmospheric constituents in the precipitation sample. The NTN provides scientists, resource managers, and policymakers with long-term, high-quality atmospheric deposition data used to support research and decision-making in the areas of air quality, water quality, agricultural effects, forest productivity, materials effects, ecosystem studies, watershed studies, and human health.