Air Resource Specialists, Inc.


Atmospheric Modeling

Yellowstone National Park winter use planning
In support of the Winter Use Plans Final Environmental Impact Statement for Yellowstone and Grand Teton National Parks and the John D. Rockefeller, Jr. Memorial Parkway, Wyoming, ARS completed analyses of potential air quality impacts from snowmobile and snowcoach operations. Using air dispersion modeling, We assessed potential air quality impacts for several preliminary alternatives and we determined maximum predicted ambient concentrations of carbon monoxide and particulate matter (PM10 and PM2.5) using the Environmental Protection Agency's mobile source intersection dispersion model, CAL3QHC, for the modeling of roadway links and park entrance stations, and the Industrial Source Complex (ISCST3) model for area source modeling at snowmobile staging/parking areas such as Old Faithful. Impacts for each preliminary alternative were assessed relative to current and historical conditions, with respect to the National Ambient Air Quality Standards, Prevention of Significant Deterioration increments for particulate matter, and potential visibility impacts. Park-wide winter season emission estimates for criteria pollutants (CO, PM, and NOx), hydrocarbons, and hazardous air pollutants (benzene, 1,3 butadiene, formaldehyde, and acetaldehyde) were calculated.

Emissions modeling for the state of Wyoming
ARS completed Phase I of the State of the Atmosphere project for the Bureau of Land Management (BLM) Wyoming office. This work examined the impact of PM10, SO2, and NOx emissions on Class I areas and sensitive Class II areas, as well as the entire state of Wyoming. CALMET and CALPUFF model processing were used to characterize current base-year air quality conditions and for use in future BLM-sponsored air quality modeling analyses required under the National Environmental Policy Act (NEPA). The Western Regional Air Partnership emissions inventory for 2002 was used with MM5 meteorological data (surface, upper air, precipitation) for the years 2001, 2002, and 2003. Modeling runs were stratified both by BLM Field Service Office jurisdiction, as well as by industry type (utilities, oil and gas, coal mining, etc.) so that the relative contributions of these source types could be examined. Resulting work products will also be used to evaluate the possible effects of BLM emissions mitigation strategies. The BLM's intent is to provide a framework that could save those performing these analyses time and money by having much of the groundwork necessary for a CALPUFF modeling analysis within Wyoming already in place. In conjunction with Phase I efforts, ARS prepared a Web site through which interested parties can download the modeling input files, processed meteorological data, tables of results, summaries of the impacts for the various areas, and the final report.