Yellowstone Will Keep Interim Winter Use Rules For Now [AUDIO]

Environmentalists say they are serving formal notice to the Environmental Protection Agency that they are prepared to sue over severe wintertime ozone pollution linked to gas drilling in western Wyoming. Yellowstone National Park will open for winter use December 15th with the same snowmobile and snow coach regulations from the previous season to take time to better address public input on proposed long-term regulations. Click past the jump to listen to Wyoming Radio News.