Maps of annual precipitation-weighted mean concentrations and depostion
are available for NTN and MDN. The maps are available as PDF images and as KMZ files.
About the maps
In 2011, the NADP Technical Committee instituted changes in the way NADP annual concentration and deposition maps are produced. It was decided to modify the original map series from a discrete contour map style to a continuous color gradient map style while incorporating an external, highly resolved precipitation dataset.
More information about the process used to create these maps is available.
NADP's Critical Loads of Atmospheric Deposition Committee has developed a special subset of NTN maps has been developed that highlights the lower end of the concentration and deposition ranges.
The old-style isopleth maps and the associated grid files through 2009 are available in the NADP Map Archive
Acceptable Use Policy
If you intend on reprinting any of these maps for use in a publication, please read our Use Conditions.