We find that gasoline-vehicles are primary contributor to benzene and MTBE, diesel-vehicles are primary contributor to CO2, formaldehyde, acetaldehyde and acrolein.

• 结果显示苯与MTBE主要来自汽油车的排放，甲醛、乙醛与丙烯醛则以重型柴油车数值最高；CO2因柴油车燃油效率较低，以柴油车数值最高。