Emission characteristics of polycyclic aromatic hydrocarbons and nitro-polycyclic aromatic hydrocarbons from diesel trucks based on on-road measurements. (January 2017)

• Record Type: Journal Article
• Authors: Cao, Xinyue; Hao, Xuewei; Shen, Xianbao; Jiang, Xi; Wu, Bobo; Yao, Zhiliang
• Is Part Of: Atmospheric environment. Volume 148(2017)
• Page Start: 190
• Page End: 196
• Publication Date: 2017-01
• Subjects: PAHs -- NPAHs -- Diesel vehicle -- Emission factors -- PEMS; Air -- Pollution -- Periodicals; Air -- Pollution -- Meteorological aspects -- Periodicals; 551.51
• DOI: 10.1016/j.atmosenv.2016.10.040
• Languages: English
• ISSNs: 1352-2310

Abstract

Abstract: Polycyclic aromatic hydrocarbon (PAH) and nitro-polycyclic aromatic hydrocarbon (NPAH) emissions from 18 diesel trucks of different sizes and with different emission standards were tested in Beijing using a portable emission measurement system (PEMS). Both the gaseous- and particulate-phase PAHs and NPAHs were quantified by high-performance liquid chromatography (HPLC) in the laboratory. The emission factors (EFs) of the total PAHs from light-duty diesel trucks (LDDTs), medium-duty diesel trucks (MDDTs) and heavy-duty diesel trucks (HDDTs) were 82229.11 ± 41906.06, 52867.43 ± 18946.47 and 93837.35 ± 32193.14 μg/km, respectively, much higher than the respective values of total NPAHs from their counterpart vehicles. The gaseous phase had an important contribution to the total PAHs and NPAHs, with a share rate of approximately 69% and 97% on average, respectively. The driving cycle had important impacts on the emissions of PAHs and NPAHs, especially for LDDTs and HDDTs. Higher emissions of PAHs and NPAHs were detected on non-highway roads compared to that on highways for these two types of vehicles. Compared to the results of different studies, the difference in the EFs of PAHs and NPAHs can reach several orders of magnitudes, which would introduce errors in the development of an emission inventory of PAHs and NPAHs. Highlights: PAHs and NPAHs from 18 diesel trucks were tested in Beijing using a PEMS. No significant reduction was observed for PAHs or NPAHs from diesel trucks with China 3 to 4 emission standards. The gaseous-phase compounds had important contributions to the total PAHs and NPAHs. Large gaps were found in the PAH and NPAH emissions from diesel vehicles when comparing the results of different studies.