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State Regulatory Plans for Protecting Park Visibility
States should have completed regional planning work and submitted their regulations to EPA by the end of 2007. These state rules must provide for improvement in visibility conditions for those national parks designated Class I by the Clean Air Act. During 2007, the NPS Air Resources Division consulted with all States as they completed their plans. For more information on the requirements of the program see EPA’s visibility program website.
Poor and good visibility conditions at Grand Canyon National Park, AZ