Motor Vehicles' Exhaust Emission Factors for Urban Transportation Planning

In the paper, the methods for emission factors are analyzed.MOBILE parameters correction and computing methods are put forward to adapt China urban transportation planning. According to the actual conditions,MOBILE parameter correction can be utilized to compute emission factors that are adapted to urban transportation planning.The computed emission factors of Nanjing at present can be used for EIA of Nanjing and nearby cities.When average speed is between 30 to 75 km/h, the emission factors of CO, NO x and HC are less.So the pollution is less.