« Previous AbstractUltraviolet-B enhances the resistance of multiple plant species to lepidopteran insect herbivory through the jasmonic acid pathway    Next AbstractSimultaneous Improvement of Mechanical and Fire-Safety Properties of Polymer Composites with Phosphonate-Loaded MOF Additives »

Environ Pollut

Title:		"Primary organic gas emissions from gasoline vehicles in China: Factors, composition and trends"
Author(s):		Qi L; Zhao J; Li Q; Su S; Lai Y; Deng F; Man H; Wang X; Shen X; Lin Y; Ding Y; Liu H;
Address:		"State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; State Key Joint Laboratory of ESPC, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, School of Environment, Tsinghua University, Beijing, 100084, China; State Key Laboratory of Plateau Ecology and Agriculture, College of Eco-environmental Engineering, Qinghai University, Xining, 810016, China. State Key Joint Laboratory of ESPC, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, School of Environment, Tsinghua University, Beijing, 100084, China. Xiamen Environment Protection Vehicle Emission Control Technology Center, Xiamen, 361023, China; National Laboratory of Automotive Performance & Emission Test, Beijing Institute of Technology, Beijing, 100081, China. Xiamen Environment Protection Vehicle Emission Control Technology Center, Xiamen, 361023, China. Beijing Municipal Environmental Monitoring Center, Beijing, 100048, China. State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Vehicle Emission Control Center (VECC), Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Electronic address: dingyan@vecc-mep.org.cn. State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; State Key Joint Laboratory of ESPC, State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, School of Environment, Tsinghua University, Beijing, 100084, China. Electronic address: liu_env@tsinghua.edu.cn"
Journal Title:		Environ Pollut
Year:		2021
Volume:		20210816
Issue:
Page Number:		117984 -
DOI:		10.1016/j.envpol.2021.117984
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"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), CH(4), 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"
Keywords:		Aerosols/analysis *Air Pollutants/analysis China Gasoline/analysis Motor Vehicles *Ozone/analysis Vehicle Emissions/analysis *Volatile Organic Compounds/analysis Emission standards (ESs) Intermediate volatility organic compounds (IVOCs) Light-duty gasolin;
Notes:		"MedlineQi, Lijuan Zhao, Junchao Li, Qiwei Su, Sheng Lai, Yitu Deng, Fanyuan Man, Hanyang Wang, Xiaotong Shen, Xiu'e Lin, Yongming Ding, Yan Liu, Huan eng England 2021/08/30 Environ Pollut. 2021 Dec 1; 290:117984. doi: 10.1016/j.envpol.2021.117984. Epub 2021 Aug 16"