Advances in Critical Loads Science and Application in the United States

Jennifer Phelan1, Jason Lynch2, Claire O’Dea3, Tonnie Cummings4, and Rick Haeuber2

1 NADP-CLAD, University of Illinois, 2204 Griffith Drive, Champaign, Illinois, 61820,,

2 U.S. EPA, 1200 Pennsylvania Avenue NW, Washington, DC, 20460

3 U.S. Forest Service, 1400 Independence Ave, SW, #1121, Washington, DC, 20250

4 U.S. National Park Service, Pacific West Region, 612 E. Reserve Street, Vancouver, Washington, 98661


The objectives of this poster are to describe recent advances in critical loads science and application in the United States (U.S.), including critical load definitions, the National Critical Load Database (NCLD), and critical load maps.   A series of critical load maps based on NCLD data are presented for the U.S.  New critical load research, new and future products, and future directions for critical loads science and application are also outlined.