Vehicle Emission Factors Determination Using CMEM in Beijing

The vehicle emission characteristics of Beijing were analyzed and studied using Comprehensive Modal Emission Model(CMEM) developed by University of California at Riverside.The required data and parameters for CMEM were collected on the base of 9 light-duty vehicles with typical technology characteristics of Beijing. With CMEM Access version of 2.02,the CO_2,CO,HC and NO_x emission factors for 4 types of typical individual light-duty vehicles and comprehensive fleet in Beijing have been determined under different transport situations.The model result has shown an encouraging consistency compared with the real road measurement for the same vehicle.As a result,CMEM is proper to determine emission factors of CO,HC and NO_x for the light-duty vehicles in Beijing.