Development of a Microscale Emission Factor Model for CO for Predicting Real-Time Motor Vehicle Emissions

ABSTRACT

The U.S. Environmental Protection Agency's (EPA) National Exposure Research Laboratory has initiated a project to improve the methodology for modeling human exposure to motor vehicle emissions. The overall project goal is to develop improved methods for modeling the source through the air pathway to human exposure in significant microenvironments of exposure. This paper presents the technical description of a newly developed model for CO emissions. The sensitivity analysis and evaluation of this emission model is presented in a companion paper titled “Sensitivity Analysis and Evaluation of MicroFacCO: A Microscale Motor Vehicle Emission Factor Model for CO Emissions.”¹ The MOBILE models (used in the United States, except California) and EMFAC models (used in California only) used to estimate emissions are suitable