This study was performed to provide a method of estimating concentrations of vehicle generated pollutants in areas where people and vehicles are in close proximity. A list of common exposure situations was extracted from hypothetical daily activity routines. For each situation, an appropriate dispersion model was selected. The range of real world physical variables for each situation was examined. From this range, typical and severe actual situations were chosen. Pollutant concentrations were calculated for each typical and severe situation using the appropriate dispersion model. Emission factors of one gram per mile or minute were used to facilitate scaling.