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Contact EPA Pacific Southwest

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Air Actions, Nevada

NOTE: This content is no longer being updated. The most up to date information can be found in Federal Register Notices and Approved Air Quality Implementation Plans in Region 9.

Grand Canyon Visibility Advance Notice of Proposed Rulemaking

On June 17, 1999, EPA published an Advance Notice of Proposed Rulemaking (ANPR) to provide information and request comment regarding the Mohave Generating Station's contribution to visibility impairment at Grand Canyon National Park (GCNP). The ANPR provided background information on Clean Air Act and EPA regulatory requirements for protecting visibility in national parks and wilderness areas, information on the visibility concerns associated with the Mohave Generating Station (MGS), and a brief summary of the methodologies and results of Project MOHAVE, the study which evaluated the impact of emissions from the MGS on visibility at GCNP. In the ANPR, EPA also asked the public to submit additional information that the Agency should consider before proceeding further to resolve DOI's concerns regarding the impact of sulfur dioxide emissions from MGS on visibility impairment at GCNP.

The Advance Notice of Proposed Rulemaking is available below. The public comment period for the ANPR closed on November 15, 1999. EPA received comments from 83 entities. The comments that EPA received are contained in Docket Number A2-99-01 in the EPA Region 9 office.

For More Information

Please contact Bruce Polkowsky of the National Park Service at (303) 987-6944.

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