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Proc Natl Acad Sci U S A

Title:		Aqueous production of secondary organic aerosol from fossil-fuel emissions in winter Beijing haze
Author(s):		Wang J; Ye J; Zhang Q; Zhao J; Wu Y; Li J; Liu D; Li W; Zhang Y; Wu C; Xie C; Qin Y; Lei Y; Huang X; Guo J; Liu P; Fu P; Li Y; Lee HC; Choi H; Zhang J; Liao H; Chen M; Sun Y; Ge X; Martin ST; Jacob DJ;
Address:		"Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138. Department of Environmental Toxicology, University of California, Davis, CA 95616. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China. Institute of Oceanography, Minjiang University, Fuzhou 350108, China. Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou 510632, China. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332. Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau 999078, China. Samsung Advance Institute of Technology, Gyeonggi-do, Suwon-si 16678, Republic of Korea. Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; caxinra@163.com djacob@fas.harvard.edu. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; caxinra@163.com djacob@fas.harvard.edu"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2021
Volume:		118
Issue:		8
Page Number:		-
DOI:		10.1073/pnas.2022179118
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
Abstract:		"Secondary organic aerosol (SOA) produced by atmospheric oxidation of primary emitted precursors is a major contributor to fine particulate matter (PM(2.5)) air pollution worldwide. Observations during winter haze pollution episodes in urban China show that most of this SOA originates from fossil-fuel combustion but the chemical mechanisms involved are unclear. Here we report field observations in a Beijing winter haze event that reveal fast aqueous-phase conversion of fossil-fuel primary organic aerosol (POA) to SOA at high relative humidity. Analyses of aerosol mass spectra and elemental ratios indicate that ring-breaking oxidation of POA aromatic species, leading to functionalization as carbonyls and carboxylic acids, may serve as the dominant mechanism for this SOA formation. A POA origin for SOA could explain why SOA has been decreasing over the 2013-2018 period in response to POA emission controls even as emissions of volatile organic compounds (VOCs) have remained flat"
Keywords:		aqueous-phase oxidation fossil-fuel combustion emissions polycyclic aromatic hydrocarbons secondary organic aerosol;
Notes:		"PubMed-not-MEDLINEWang, Junfeng Ye, Jianhuai Zhang, Qi Zhao, Jian Wu, Yangzhou Li, Jingyi Liu, Dantong Li, Weijun Zhang, Yange Wu, Cheng Xie, Conghui Qin, Yiming Lei, Yali Huang, Xiangpeng Guo, Jianping Liu, Pengfei Fu, Pingqing Li, Yongjie Lee, Hyun Chul Choi, Hyoungwoo Zhang, Jie Liao, Hong Chen, Mindong Sun, Yele Ge, Xinlei Martin, Scot T Jacob, Daniel J eng Research Support, Non-U.S. Gov't 2021/02/18 Proc Natl Acad Sci U S A. 2021 Feb 23; 118(8):e2022179118. doi: 10.1073/pnas.2022179118"