Air pollution-related lichen monitoring in National Parks, Forests, and Refuges: Guidelines for studies intended for regulatory and management purposes
Blett T, Geiser L, Porter E. 2003. Air pollution-related lichen monitoring in National Parks, Forests, and Refuges: Guidelines for studies intended for regulatory and management purposes. NPS D2292. National Park Service, Air Resources Division. Denver
The report discusses the sensitivity of lichens to air pollution and how the National Park Service, U.S. Forest Service, and U.S. Fish and Wildlife Service are using this sensitivity to monitor air quality in the parks, forests, and refuges.