| Title: | Secondary Organic Aerosol Formation of Fleet Vehicle Emissions in China: Potential Seasonality of Spatial Distributions |
| Author(s): | Liao K; Chen Q; Liu Y; Li YJ; Lambe AT; Zhu T; Huang RJ; Zheng Y; Cheng X; Miao R; Huang G; Khuzestani RB; Jia T; |
| Address: | "State Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau 999078, China. Aerodyne Research, Inc., Billerica, Massachusetts 01821, United States. State Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, and Key Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Vehicle emissions are an important source of urban particular matter. To investigate the secondary organic aerosol (SOA) formation potential of real-world vehicle emissions, we exposed on-road air in Beijing to hydroxyl radicals generated in an oxidation flow reactor (OFR) under high-NO(x) conditions on-board a mobile laboratory and characterized SOA and their precursors with a suite of state-of-the-art instrumentation. The OFR produced 10-170 mug m(-3) of SOA with a maximum SOA formation potential of 39-50 mug m(-3) ppmv(-1) CO that occurred following an integrated OH exposure of (1.3-2.0) x 10(11) molecules cm(-3) s. The results indicate relatively shorter photochemical ages for maximum SOA production than previous OFR results obtained under low-NO(x) conditions. Such timescales represent the balance of functionalization and fragmentation, possibly resulting in different spatial distributions of SOA in different seasons as the oxidant level changes. The detected precursors may explain as much as 13% of the observed SOA with the remaining plausibly contributed by the oxidation of undetected intermediate-volatility organic compounds. Extrapolation of the results suggests an annual SOA production rate of 0.78 Tg yr(-1) from mobile gasoline sources in China, highlighting the importance of effective regulation of gaseous vehicular precursors to improve air quality in the future" |
| Keywords: | Aerosols/analysis *Air Pollutants/analysis Beijing China *Vehicle Emissions/analysis Soa high NOx mobile laboratory oxidation flow reactor spatial distributions vehicle emissions; |
| Notes: | "MedlineLiao, Keren Chen, Qi Liu, Ying Li, Yong Jie Lambe, Andrew T Zhu, Tong Huang, Ru-Jin Zheng, Yan Cheng, Xi Miao, Ruqian Huang, Guancong Khuzestani, Reza Bashiri Jia, Tianjiao eng Research Support, Non-U.S. Gov't 2021/05/20 Environ Sci Technol. 2021 Jun 1; 55(11):7276-7286. doi: 10.1021/acs.est.0c08591. Epub 2021 May 19" |
