| In this paper, we take Xian as example for explaining that emission pollutant of light duty gasoline vehicles affect environment of Xian city. Emission pollutants do great harm to city environment and health of human. The number of light duty gasoline vehicles account for half of number of motor vehicles. Quantity of emission pollutants of light duty gasoline vehicles affect environment of Xian city directly, so it is great important to study the contribution of emission pollutant of light duty gasoline vehicles to the city environment pollutant for the control of emission, the establishment of policy and law and the improvement of traffic environment.In three pollutants (NOx, SO2 and TSP) supervising by Xian environment agency, SO2 from motor emission affects the quality of city environment, but the influence is very little. PM10 which is a kind of particulates with the diameter less than or equal to 10 micron has a little association with motor emission. It is very difficult to supervise HC and CO in the air. NOx become the only adequate factor for evaluating the influence between motor emission and city environment. TSP pollution which is the prime pollutant in Xian rages fast and furious in Xian, to a certain extent, TSP pollution conceals motor emission pollution. In the paper, we collect datum from Xian environment agency and show qualitative relation between motor emission and city environment with figure and form.In the paper, we choose MOBILE5 mode with Visual basic to calculate emission quantity of light duty gasoline vehicles in Xian in 2004 and explain the emission level of light duty gasoline vehicles and the reason through compare with emission standard of light duty gasoline vehicles. We can get the NOx pervasion mode using OSPM mode and we calculate the contribution of light duty gasoline vehicles to the city environment with OSPM mode, so we accomplish the evaluation of influence which light duty gasoline vehicles affect city environment. |
