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 folder for the agency that you want data for.
2. Select the region folder or use the map to identify the region that your park/forest is in.
3. Download the PDF and explore it for critical load data.
4. The document has 4 sections: 1) CL Summary, 2) deposition summary, 3) Critical Loads of N, 4) Critical Loads of Sulfur.
5. The Critical Loads of N has data for up to 8 critical loads: alpine communities, aquatic eutrophication, herbaceous species richness, individual herbaceous species, epiphytic lichen communities, tree species growth, tree species survival, and soil mycorrhizae.
6. The Critical Loads of S section has data for 5 critical loads: aquatic acidification, individual herbaceous species, epiphytic lichen communities, tree species growth, and tree species survival.