4.7 Article

Primary organic gas emissions from gasoline vehicles in China: Factors, composition and trends

期刊

ENVIRONMENTAL POLLUTION
卷 290, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.117984

关键词

Total organic gases (TOGs); Volatile organic compounds (VOCs); Intermediate volatility organic compounds; (IVOCs); Emission standards (ESs); Light-duty gasoline vehicles (LDGVs)

资金

  1. National Natural Science Foundation of China [41822505, 42061130213]
  2. State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation [VECS2021S01]
  3. Royal Society of UK through Newton Advanced Fellowship [NAF\R1\201166]
  4. Beijing Nova Program [Z181100006218077]
  5. Tsinghua University Initiative Scientific Research Program
  6. Foshan-Tsinghua Innovation Special Fund [FTISF-2019THFS0402]

向作者/读者索取更多资源

Continuous tightening emission standards have led to a reduction in organic gas emissions from gasoline vehicles, with VOC emissions being the most effectively controlled subgroup. Along with more stringent emission standards, the mass fraction of VOCs in TOGs decreased while IVOCs increased. Moreover, the study highlights the importance of controlling OVOC emissions and addressing IVOC emissions from LDGVs for future improvement.
Continuous tightening emission standards (ESs) facilitate the reduction of organic gas emissions from gasoline vehicles. Correspondingly, it is essential to update the emissions and chemical speciation of total organic gases (TOGs), including volatile organic compounds (VOCs), intermediate volatility organic compounds (IVOCs), CH4, and unidentified non-methane hydrocarbons (NMHCs) for assessing the formation of ozone and secondary organic aerosol (SOA). In this study, TOG and speciation emissions from 12 in-use light-duty gasoline vehicle (LDGV) exhausts, covering the ESs from China II to China V, were investigated on a chassis dynamometer under the Worldwide Harmonized Light-duty Test Cycle (WLTC) in China. The results showed that the most effectively controlled subgroup in TOG emissions from LDGVs was VOCs, followed by the unidentified NMHCs and IVOCs. The mass fraction of VOCs in TOGs also reduced from 61 +/- 9% to 46 +/- 18% while the IVOCs gently increased from 2 +/- 0.4% to 8 +/- 4% along with the more stringent ESs. For the VOC subsets, the removal efficiency of oxygenated VOCs (OVOCs) was lower than those of other VOC subsets in the ESs from China IV to V, suggesting the importance of OVOC emission controls for relatively new LDGVs. The IVOC emissions were mainly subject to the ESs, then driving cycles and fuel use. The formation potentials of ozone and SOA from LDGVs decreased separately 96% and 90% along with the restricted ESs from China II-III to China IV. The major contributor of SOA formation transformed from aromatics in the VOC subsets for China II-III vehicles to IVOCs for China IV/V vehicles, highlighting that IVOC emissions from LDGVs are also needed more attentions to control in future.

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