经过对北京市2007年公交车队的详细技术构成与实际运营情况的调研,发现北京市公交车队的主力车型为国三和国四车辆,应用修正的COPERTIV模型计算出北京市各技术水平的汽油、柴油和压缩天然气(CNG)公交车的排放因子.2007年北京市国三CNG公交车PM2.5和NOx单车排放因子分别比国三柴油车削减了97%和30%,而公交车队中排放控制最为严格的EEV天然气公交车的PM2.5和NOx单车排放因子分别比国四柴油公交车削减了93%和69%.但由于CNG公交车的CH4排放水平较高,导致CNG公交车的总碳氢化合物(THC)单车排放因子显著高于相近控制水平的柴油公交车.在单车排放水平的基础上建立了北京市公交车排放清单,2007年北京市公交车排放的CO、NMHC、THC、NOx和PM2.5分别为9051t、955t、1222t、8553t和161t.与没有CNG公交车的对照情景进行比较,在使用了CNG公交车后,2007年北京市公交车CO、NMHC、NOx和PM2.5排放总量分别削减了293t、62t、775t和33t,削减比例分别为3.1%、6.1%、8.3%和17.2%.2007年北京市通过在公交车队中使用CNG车辆共减少了柴油消耗量约5.0×104t,相当于北京市各行业柴油总消耗量的2.6%.2007年北京市公交车尾气排放的温室气体的CO2当量为8.3×105t,比不使用CNG车辆的情景略微增加了2.4%. After the investigation of the detailed technical composition and actual operation of the bus fleet in Beijing in 2007, it is found that the main bus fleet in Beijing is Guosan and Guo 4 vehicles. The revised COPERTIV model is used to calculate the technical level Gasoline, diesel and compressed natural gas (CNG) buses in 2007. The emission factors of PM2.5 and NOx for Guosan CNG buses in Beijing were reduced by 97% and 30% respectively compared with Guosan diesel vehicles in 2007, while the bus fleet In the EEV natural gas bus with the strictest emission control, PM2.5 and NOx bicycle emission factors were reduced by 93% and 69% respectively compared with that of the No. 4 diesel bus.But due to the high level of CH4 emission of CNG buses, CNG buses Of total hydrocarbon (THC) cycling emission factor was significantly higher than the similar control level of diesel buses.Based on the level of cycling emissions, the Beijing bus emission inventory was established, and the CO, NMHC emissions of buses in Beijing in 2007, THC, NOx and PM2.5 were 9051t, 955t, 1222t, 8553t and 161t, respectively.Compared with the control scenario without CNG bus, after using CNG bus in 2007, Beijing bus CO, NMHC, NOx and PM2.5 The emissions were reduced by 293t, 62t, 775t and 33t respectively, with reductions of 3.1%, 6.1%, 8.3% and 17.2% respectively. In 2007, Beijing reduced total diesel consumption by using CNG vehicles in the bus fleet 5.0 × 104t, which is equivalent to 2.6% of the total diesel consumption of various industries in Beijing. The CO2 equivalent of greenhouse gas emitted from bus exhaust in Beijing in 2007 was 8.3 × 105t, slightly increased by 2.4% compared with that of the vehicle without CNG.