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Prior research using the GIFT model generated annual emission totals and truck count estimates for routes and road segments associated with the transport of materials and wastes from natural gas wells in the Marcellus Shale region. Road segments with the highest estimated truck counts (> 25,000) were identified and used to select 72 regions, representing the boundaries of 72 USGS quadsheets, for further analysis using the emission dispersion model AERMOD.