An In-use Snowmobile Emission Survey in Yellowstone National Park
Publication Date
9-24-1999
Document Type
Article
Organizational Units
College of Natural Science and Mathematics, Chemistry and Biochemistry
Keywords
Atmospheric chemistry, Emissions, Pollutants, Snowmobiles
Abstract
Snowmobiles (sleds) have become a very popular way for visitors to explore Yellowstone National Park during its winter season with more than 60 000 visits during the 1997 - 1998 season. In-use emissions data are very limited, and only a small number of sleds tested under controlled conditions have had their measurements reported. Snowmobiles are currently manufactured and marketed in the U.S. by four companies: Arctic Cat, Bombardier (Ski-Doo), Polaris, and Yamaha. Using the University of Denver’s nondispersive infrared remote sensing equipment carbon monoxide (CO) and hydrocarbon (HC) emission measurements were collected on 1210 sleds at the West Yellowstone, MT park entrance during 4 days in February 1998. Mean emissions for the measurements were 5.56 +/- 0.07% CO and 2.58 +/- 0.02% HC (as propane). Using a carbon to hydrogen molar ratio of 1:2 for the fuel, the emissions are 460 +/- 6 gCO and 331+/- 2 g HC per kilogram of fuel consumed. This is in large part because snowmobiles utilize conventional two- stroke engine designs which cannot avoid extensive blowby (the exhaust port and intake port being open at the same time) of the unburned fuel, oil, and air mixture which is also poorly regulated by simple carburetors.
Copyright Statement / License for Reuse
All Rights Reserved.
Copyright Date
9-24-1999
Rights Holder
American Chemical Society
Provenance
Received from author
Language
English (eng)
Extent
3 pgs
Publication Statement
Copyright is held by the American Chemical Society. User is responsible for all copyright compliance.
Publication Title
Environmental Science & Technology
Volume
33
First Page
3924
Last Page
3926
Recommended Citation
Bishop, G. A., Stedman, D. H., Hektner, M., & Ray, J. D. (1999). An in-use snowmobile emission survey in Yellowstone National Park. Environmental Science & Technology, 33, 3924-3926, DOI: 10.1021/es990425p