Abstract
The MOBILE emission factor model (the newest version MOBILE6) has been widely used in China to estimate its mobile source emissions. Because MOBILE was developed in the United States, most of its default input parameters represent the average traffic characteristics and environmental conditions of the United States. Hence, it is necessary to adjust the values of the input parameters of MOBILE to accommodate local conditions and improve the accuracy of the emission estimation in China. An application is presented of the small sampling approach to adjusting the default mileage accumulation rates (MARs) for Beijing. A small-sized survey was conducted in Beijing to collect the mileage information. The adjustment factors for the MARs were then generated by using the small sampling approach for a variety of vehicle types. Finally, the MOBILE emission factors were generated by using the adjusted MARs. Results show that the emission factors generated by adjusted local mileage accumulation rates are significantly different from those generated by the default rates.
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