Air Quality Analysis of Snowmobile and Snowcoach Emissions: Yellowstone National Park 2004-05 Winter Use Plan
http://nps.gov/yell/technical/planning/winteruse/plan/reports/airquality04.pdf

Air Resource Specialists, National Park Service


This technical report details the data and procedures used to generate the emission factors necessary for the analyses of various alternatives of snowmobile and snowcoach operations in Yellowstone National Park. It includes procedures, data, tables and graphs from both past air quality and emissions testing and studies, as well as from vehicle manufacturers. It also discusses the results of atmospheric dispersion modeling analyses to calculate the ambient levels of carbon monoxide at three sites within Yellowstone National Park.

This resource is referenced here:
Subject: Geoscience:Atmospheric Science:Meteorology:Air quality, Environmental Science:Air Quality
Resource Type: Scientific Resources:Research Results