Annual Maps

Maps of annual precipitation-weighted mean concentrations and deposition 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.

Available Maps

Additional Maps

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.

NADP's Total Deposition Science Committee (TDEP) has developed total deposition (wet + dry) maps using a hybrid approach that combines measured air concentration and wet deposition data and modeled deposition velocity and dry deposition data.

Acceptable Use Policy

If you intend on reprinting any of these maps for use in a publication, please read our Use Conditions.