Access the relevant website and a step-by-step guide for using the website.

National Critical Loads Database (NCLD)

Lichens & Air Quality Database (USFS)

NADP TDep (Total Deposition) Maps

CMAQ

CASTNET

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Step-by-step instructions

To query the database click on ‘Database Queries’ from left hand menu.
Select a dataset from the drop down menu (Lichen Plot Data, Elemental Analysis Data or Lichen Species Data).
Select the region, Area of interest, USFS.