BILLINGS, Mont. (AP) - Noise emissions at three key spots in Yellowstone National Park were "substantially lower" last winter, but still routinely exceeded thresholds set by the National Park Service, ...

Under a long-term plan for winter use of Yellowstone National Park announced Monday, snowmobile noise is expected to be about the same as under a previous proposal that actually allowed 180 more ...

BILLINGS, MONT. (LEE)-Despite technology and fewer numbers, noise is still an issue with snowmobiling in Yellowstone National Park, according to a new report. Snowmobiles exceeded noise thresholds ...

YELLOWSTONE NATION AL PARK — Cindy Magnuson has had respiratory problems for years. She traveled from Moscow, Idaho, to cross-country ski Friday in Yellowstone National Park and participate in ...

BILLINGS (AP) -- Noise emissions at three key spots in Yellowstone National Park were ''substantially lower'' last winter, but still routinely exceeded thresholds set by the National Park Service, a ...