From the Billings Gazette: "The levels of air and noise pollution that Yellowstone National Park workers were exposed to declined after new limits on the number and type of snowmobiles allowed in the park went into effect, a study shows."
You can read the report on air and noise pollution in Yellowstone on the Yellowstone National Park website: "Yellowstone Winter Use Personal Exposure Monitoring."
Source: "Park winter noise, air pollution down." Billings Gazette November 8, 2005.
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