Heavy-duty diesel vehicles dominate vehicle emissions in a tunnel study in northern China

The Science of the Total Environment
Congbo SongHongjun Mao

Abstract

The relative importance of contributions of gasoline vehicles (GVs) and diesel vehicles (DVs), heavy-duty diesel vehicles (HDDVs) and non-HDDVs to on-road vehicle emissions remains unclear. Vehicle emission factors (EFs), including fine particulate matter (PM2.5), NO-NO2-NOx, and carbon monoxide (CO), were measured (August 4-18, 2017) in an urban tunnel in Tianjin, northern China. The average EFs (mg km-1 veh-1) of the fleet were as follows: 9.21 (95% confidence interval: 1.60, 23.07) for PM2.5, 62.08 (21.21, 138.25) for NO, 20.42 (0.79, 45.48) for NO2, 83.72 (26.29, 162.87) for NOx, and 284.54 (18.22, 564.67) for CO. The fleet-average EFs exhibited diurnal variations, due to diurnal variations in the proportion of HDDVs in the fleet, though the hourly proportion of HDDVs never exceeded 10% during the study period. The reconstructed average EFs for on-road vehicle emissions of PM2.5, NO, NO2, and NOx, and CO were approximately 2.2, 1.7, 1.5, 2.0, and 1.6 times as much as those in the tunnel, respectively, due to the higher HDDV fractions in the whole city than those in the tunnel. The EFs of PM2.5, NO, NO2, and NOx, and CO from each HDDV were approximately 75, 81, 24, 65, and 33 times of those from each non-HDDV, respectively. ...Continue Reading

Citations

Jan 16, 2020·Environmental Science and Pollution Research International·Oludaisi Adekomaya
Nov 28, 2018·Environmental Science and Pollution Research International·Pan WuJianqiang Zhang
Jun 5, 2020·Nature Communications·Fanyuan DengHuan Liu
Jun 20, 2020·The Science of the Total Environment·Yuhan HuangHwai Chyuan Ong
Jul 20, 2018·Environmental Science & Technology·Jonathan M WangGreg J Evans
Nov 9, 2021·The Science of the Total Environment·Ru-Jin HuangRenjian Zhang

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