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Denali National Park and PreservePurple Cress
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Denali National Park and Preserve
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Visibility is an important  component of measuring Denali's air quality  

Did You Know?
Visibility is an important component of measuring Denali's air quality. Visibility data, such as that from the Wonder Lake camera, supplements chemical data from filter samples. Air here is still clean, but traces of pollution from local, regional and international sources exists on filter samples.

Last Updated: May 28, 2009 at 22:35 EST