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Environ Res

Title:		A comprehensive study on emission of volatile organic compounds for light duty gasoline passenger vehicles in China: Illustration of impact factors and renewal emissions of major compounds
Author(s):		Li B; Wang J; Wang J; Zhang L; Zhang Q;
Address:		"Department of Environmental Engineering, College of Environment and Resource, Zhejiang University, Hangzhou, 310058, China. State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation, Chinese Academy of Environmental Planning, Beijing, 100012, China; Department of Environmental Science, College of Environment and Resource, Zhejiang University, Hangzhou, 310058, China. Department of Environmental Engineering, College of Environment and Resource, Zhejiang University, Hangzhou, 310058, China. Electronic address: qy_zhang@zju.edu.cn"
Journal Title:		Environ Res
Year:		2021
Volume:		20201111
Issue:
Page Number:		110461 -
DOI:		10.1016/j.envres.2020.110461
ISSN/ISBN:		1096-0953 (Electronic) 0013-9351 (Linking)
Abstract:		"BACKGROUND: Many volatile organic compounds (VOCs) are efficient precursors for both ozone and secondary organic aerosol (SOA) which are problematic to environmental controls in many global cities. Vehicle emission is one of the most important anthropogenic sources for VOCs. In between, light duty gasoline passenger vehicles (LDGPVs) contributed more than half of the on-road vehicles in China, demonstrating unique emission characteristics and also significant contributions in emission inventory. OBJECTIVES: To illustrate the variation of VOCs emissions from LDGPVs under different conditions, evaluate the sensitivity of the potential influencing factors, such as emission standards, displacement, cumulative mileage, and driving mode, on the VOCs emissions profiles, and to update the emission inventory by taking into account of the most influential factor. METHODS: In this study, seventy-four in-used LDGPVs were examined by the chassis dynamometer. A total of 25 VOCs in the emissions was quantified using an online time of flight mass spectrometer (TOF-MS). Fuel-based emission factors (EF) were calculated. RESULTS: The results showed that the maximum SigmaEF (260.4 +/- 241.1 mg/L) was seen for LDGPVs at a high acceleration rate (0.9 m/s(2)). From the technical control emission standard aspect, the total emission factor of VOCs (expressed as summation operatorEF) was declined for China IV LDGPVs relative to China III vehicles, with the decreasing extent determined as 24.8%. Among LDGPVs with engine capacity of <1.5 L, 1.5-2.5 L and >2.5 L, it is for 1.5-2.5 L that the lowest summation operatorEF (101.2 +/- 70.1 mg/L) was determined. Along with the increasing of cumulative mileage, the EF values of VOCs were uplift, and the summation operatorVOCs increased almost linearity, while the increasing trend became steady for summation operatorEF when the cumulative mileage more than 8 x 10(4) km. As for different driving conditions, the sequence of EFs from high to low are presented as acceleration (239.3 +/- 203.5 mg/L) >idle (226.1 +/- 195.6 mg/L) >deceleration (218.5 +/- 193.1 mg/L)>uniform (218.2 +/- 182.5 mg/L)>slide (176.1 +/- 165.2 mg/L). While the cruising speeds increased between 15 and 50 km/h, the linearity between SigmaEF declined; however, an opposite trend was seen when the acceleration rates increased. In the chemical speciation, the reactive aromatics contributed the largest fraction of the VOCs (>40%). The ratio of benzene to toluene (B/T) was loaded in high interval (0.94-1.33) in this paper. Larger fluctuation of coefficient of variation (CV) was found among different cumulative mileage and displacement. By taking into account the deterioration effect related to cumulative mileage, emissions of butene, pentene, benzene and toluene were 42.9 Gg, 49.7 Gg, 109.6 Gg and 51.9 Gg in respect for LDGPVs that composed of China III and China IV. CONCLUSIONS: Our results demonstrated the necessaries in upgrading the emission control technology. Cumulative mileages and displacements are the two most dominated factors that impacted on the EFs and chemical profiles of VOCs. The higher emission of benzene estimated demonstrated the possible elevation of VOCs in comparison with previous studies"
Keywords:		*Air Pollutants/analysis China Cities Environmental Monitoring Gasoline Vehicle Emissions/analysis *Volatile Organic Compounds/analysis Cumulative mileage Driving mode Emission factors Emissions LDGPVs;
Notes:		"MedlineLi, Bowei Wang, Jinnan Wang, Jingling Zhang, Lijuan Zhang, Qingyu eng Research Support, Non-U.S. Gov't Netherlands 2020/11/15 Environ Res. 2021 Feb; 193:110461. doi: 10.1016/j.envres.2020.110461. Epub 2020 Nov 11"