Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 22, Pages 13492-13500Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b04129
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Funding
- National Natural Science Foundation of China [51322804, 51378285]
- National Science & Technology Pillar Program of China [2013BAC13B03]
- National High Technology Research and Development Program (863) of China [2013AA065303]
- Program for New Century Excellent Talents in University [NCET-13-0332]
- National Key Basic Research and Development Program of China [2013CB228505]
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Black carbon (BC) emissions from heavy-duty diesel vehicles (HDDVs) are rarely continuously measured using portable emission measurement systems (PEMSs). In this study, we utilize a PEMS to obtain real-world BC emission profiles for 25 HDDVs in China. The average fuel-based BC emissions of HDDVs certified according to Euro II, III, IV, and V standards are 2224 +/- 251, 612 +/- 740, 453 +/- 584, and 152 +/- 3 mg kg(-1), respectively. Notably, HDDVs adopting mechanical pump engines had significantly higher BC emissions than those equipped with electronic injection engines. Applying the useful features of PEMSs, we can relate instantaneous BC emissions to driving conditions using an operating mode binning methodology, and the average emission rates for Euro II to Euro IV diesel trucks can be constructed. From a macroscopic perspective, we observe that average speed is a significant factor affecting BC emissions and is well correlated with distance-based emissions (R-2 = 0.71). Therefore, the average fuel-based and distance-based BC emissions on congested roads are 40 and 125% higher than those on freeways. These results should be taken into consideration in future emission inventory studies.
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