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Enviros hope long-sought closing of coal-fired power plant will boost air quality at Grand Canyon NP

GRAND CANYON NATIONAL PARK — It's a calm, cold September morning on the South Rim of the Grand Canyon. The sunrise peeks into the mile-deep wonder, shines off the Colorado River and the Canyon's colorful walls and refracts through smoke in the distance that partially obstructs the view of the North Rim, 10 miles across the chasm.

The smoke is likely from controlled burns by the U.S. Forest Service. It enhances the sunrise, highlighting the golden prisms of light and subtly contrasting the rainbow forming from a row of rolling storm clouds. On some days, this is about as clear a view as a visitor can hope for this time of year.

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