As a air quality nonattainment area, the OKI region is subject to federal transportation conformity requirements.  All transporation plans and programs must be consistent with established emissions budgets.  OKI’s conformity assessment utilizes U.S.EPA’s emissions model MOBILE6.2 to develop emission factors for volatile organic compounds (VOC’s), oxides of nitrogen (NO_X) and fine particulates (PM2.5). The MOBILE6.2 input file contains local parameters, developed through consultation with Ohio EPA, for temperature, humidity, vehicle inspection and maintenance programs and fuel characteristics.  The local parameters are combined with the vehicle miles of travel (VMT) tables from the OKI Travel Demand Model to produce one set of emission factors measured in grams per mile for the appropriate calendar year (from 2000 to 2030).  These emission factors are then multiplied by VMT.  The methodologies incorporated into MOBILE6.2 for estimating emissions are based on methods and research conducted by U.S.EPA.  Information and technical details regarding OKI’s most recent air quality conformity determination can be found here.