Tuesday, February 20, 2007
Fewer snowmobiles, better air
A new study by the National Park Service shows the air quality at two of the most popular winter spots in Yellowstone National Park continues to improve. Levels of carbon monoxide and particulates at West Yellowstone, the park's west entrance, and Old Faithful, are well below national ambient air-quality standards. The pollutants have decreased since the park lowered the number of snowmobiles allowed in, and because of new requirements that all snowmobiles meet noise and emissions standards.