NTN Maps
Animated Maps
The
animated maps display the National Trends Network (NTN) concentration and deposition maps from 1985 to 2004 for sulfate, nitrate, and ammonium and the deposition maps for nitrogen from nitrate and ammonium. Flash and PowerPoint versions are available.
Annual Isopleth Maps
Isopleths maps of precipitation-weighted mean concentrations and depostion
are available for NTN and MDN.
Use our interactive Map Viewer to view images of the isopleth maps, or to download PDF or KLM versions.
More about the maps
The subset of sites that are included on the maps consist of only the ones that met the
NADP Completeness Criteria for the annual period.
The Arcview grid files used to develop the maps are also available.
If you intend on reprinting any of these maps for use in a publication, please read our Use Conditions.