Vehicle emissions are one of the main sources of ambient air PM2. 5pollution. More than 80% of the vehicular PM2. 5emissions are from heavyduty diesel vehicles(HDDVs). In order to study the emission characteristics of PM2. 5and its carbonaceous components from HDDVs,portable emission measurement system(PEMS) was used to test the PM2. 5emissions from seven HDDVs meeting different emission standards on the real road,and its OC and EC components were also analyzed. The results show that the PM2. 5emission fact...
1引言(Introduction)近年来,我国主要大中城市因PM2.5所引起的雾霾问题日益突出,机动车排放是大气PM2.5污染主要来源之一(Ji et al.,2014;Wang et al.,2014a,2014b;周磊等,2011;Kim Onah et al.,2006).随着对汽油车排放控制效果的显现,我国柴油车排放污染问题日益突出,有研究表