Critical Loads Tools and Reports

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

CLAS–Critical Loads Assessment by Site

EPA CL Mapper

Air Quality Conditions & Trends
National Parks

Air Quality Conditions & Trends
National Forests

Air Quality Conditions & Trends
U.S. Fish and Wildlife Service

CLAD CL Summary Reports

Wilderness Air Quality Values for WSP (Wilderness Stewardship Performance)

Forest Vulnerability Hotspots Mapper (USFS)

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Step-by-step instructions

1. Select the unit of interest.
2. Under parameter select nitrogen or sulfur deposition.
3. Select “view data”.
4. The ecosystem response section summarizes CL exceedances.
5. For more information about how ecosystem condition is linked to CLs and to see the benchmark.