| http://www.w3.org/ns/prov#value | - The National Park Service and U.S. Fish and Wildlife Service reported in December 2000 that pervasive visibility impairment in all national parks and wilderness areas" is adversely affecting these public lands.12 According to the Department of the Interior, Visibility impairment is the most ubiquitous air pollution-related problem in our national parks and refuges ??? parks and refuges such as G
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