Recently, however, winter recreation has become increasingly motorized, noisy, and dirty. Approximately 250,000 snowmobiles enter the Park System each year in the lower 48 States, and Alaskan parks also allow large numbers of snowmobiles. Snowmobiles are not just another way to enjoy the awe-inspiring winter season in the National Park System. Emissions include hydrocarbons, nitrogen oxides, MTBE, particulate matter, and carbon monoxide. These compounds have been found to cause cancer and other health problems.
Snowmobiles are a tremendous danger to wildlife.
Studies show that Bald eagles and Grey wolves, both of which are endangered species, are threatened by these vehicles. Other species such as bison, white tailed deer, elk, birds and small mammals are also vulnerable. Carbon monoxide causes dizziness, headaches, throat irritation, and nausea. Park Rangers at entrance stations complained that they were feeling ill, and the Park Service now pumps fresh air into its offices. Accidents are a major concern.