| Taking the buses in Chancheng district, Foshan City during 2015 as the research objects, the local emission factors of buses were calculated using the modified COPERT Ⅳ model, and the present situation of pollution emission was analyzed. Moreover, the reduction emission of natural gas (CNG) buses compared with diesel buses in Chancheng district during 2015 were analyzed emphatically. The results showed that the bus emissions of CO, VOCs, NOx and PM2.5 were 180.73 t, 176.92 t, 672.87 t and 14.17 t in Chancheng district in 2015 respectively. With natural gas buses instead of diesel buses, NOx and PM2.5 emissions were reduced by 53.39% and 79.11% respectively. To further analyze the actual exhaust pollution characteristics of the natural gas buses in Chancheng area, the remote sensing monitoring data were utilized, which showed that the CO emission was basically steady and the NOx emission fluctuated greatly, and the corresponding pollution control measures were put forward accordingly. |
