This document discusses the sensitivity of various input parameter effects on emission rates using the US Environmental Protection Agency's (EPA's) MOVES2010a model at the regional level. Pollutants included in the study are carbon monoxide (CO), Oxides of Nitrogen (NOX), Particulate Matter of less than 2.5 micrometers (PM2.5), and Volatile Organic Compounds (VOCs). Similar trends for PM10as reported for PM2.5 and Nitrogen Dioxide (NO2) as NOXexist and inferences to these pollutants may also be made. Results are presented using the predicted emission rates (grams/mile) for running exhaust and starts across multiple MOVES source types