This doesn t even begin to approach a violation of the standard. Thus, each snowmobile entering the NPS unit emits 1 pound of PAH s per four-hour visit. According to Klim, the calculation should be correctly expressed in micrograms. In this case, said Klim, the actual amount of PAH s emitted per four-hour visit is .000543 lbs. That s about pound divided by 1000.
Accurate calculations make a big difference when it comes to solid science.
Interested user groups including the BlueRibbon Coalition, the American Council of Snowmobile Associations, and the International Snowmobile Manufacturer s Association have recently joined with gateway communities, counties and states to lend support and assistance to the Park Service in its dual mission to preserve and protect Yellowstone. These groups agree that measures are needed to safeguard the quality of the wintertime visitor experience. They have encouraged the Park to adopt a course of action that would embrace an adaptive approach to management and take a hard line on controversial issues including noise and emissions. The Revised Alternative asks the Park to set caps on visitor numbers, to close park roadways at night, and continue extensive scientific research. The revised alternative also asks Park officials to mandate the exclusive use of bio-based fuels and lubricants within Yellowstone, a measure proven to reduce emissions significantly.