Calculating Vehicular Emission Factors with COPERTIII Mode in China

The COPERTⅢ model for calculating the emission factors of motor vehicles is described and the required parameters are determined based on the actual categories,driving cycles and fuel oil characteristics of motor vehicles in China.And then the model is used to calculate the vehicle emission factors of CO,NO_x,NMVOC and PM in China in 2002.By comparing the difference between the emission factors derived from the COPERTⅢ model,the MOBILE model and the chassis dynamometer,it is found that the emission factors calculated using the COPERTⅢ model is better close to those in the actual emission status in China.