Environmental Protection Agency: Regional Haze Program

EPA and other Agencies have been monitoring visibility in national parks and wilderness areas since 1988.

In 1999, the U.S. Environmental Protection Agency announced a major effort to improve air quality in national parks and wilderness areas. The Regional Haze Rule calls for state and federal agencies to work together to improve visibility in 156 national parks and wilderness areas such as the Grand Canyon, Yosemite, the Great Smokies and Shenandoah.


Science Topics
Conservation & Sustainability, Meteorology, Pollution
Middle School
6th Grade, 7th Grade, 8th Grade

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