Winter Air Quality in Yellowstone National Park 2007-2008 by John D. Ray Ph. D., U. S. Department National Park Service

28 pages missing pub info (editions)

nonfiction education nature
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The effects of winter vehicle exhaust, primarily from snowmobiles, on air quality became an issue in the later 1990's at Yellowstone National Park, WY. For the last several years, ambient air quality monitoring has been conducted at two locations ...

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