Snowmobile Usage in Yellowstone National Park
http://www.nps.gov/yell/planyourvisit/winteruse.htm

National Park Service


This National Park Service website describes the regulations on snowmobile usage in Yellowstone and extensive research on the impact of snowmobiles on wildlife areas.

This resource is referenced here:
Subject: Environmental Science:Air Quality:Pollutants, Geoscience:Atmospheric Science:Meteorology:Air quality:Pollutants, Dust and Particulates, Environmental Science:Policy:Environmental Decision-Making, Environmental Science:Air Quality:Dust and Particulates, Geoscience:Atmospheric Science:Meteorology:Air quality
Resource Type: Scientific Resources:Research Results, Datasets and Tools:Datasets
Environmental Policy: Environmental Decision-Making
Focus on Yellowstone: Policy and management