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Division of Air Resource Management

EPA’s Regional Haze Program

In 1999, the U.S. Environmental Protection Agency (EPA) 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 Everglades, Grand Canyon, Yosemite, the Great Smoky Mountains and Shenandoah.

See below to learn about the work DEP is doing for the current implementation period and other background information.

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