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Sci Total Environ

Title:		Photochemical ozone pollution in five Chinese megacities in summer 2018
Author(s):		Liu X; Guo H; Zeng L; Lyu X; Wang Y; Zeren Y; Yang J; Zhang L; Zhao S; Li J; Zhang G;
Address:		"Air Quality Studies, Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China. Air Quality Studies, Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China. Electronic address: ceguohai@polyu.edu.hk. Institute for Environmental and Climate Research, Jinan University, Guangzhou, China. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China"
Journal Title:		Sci Total Environ
Year:		2021
Volume:		20210812
Issue:
Page Number:		149603 -
DOI:		10.1016/j.scitotenv.2021.149603
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"To investigate photochemical ozone (O(3)) pollution in urban areas in China, O(3) and its precursors and meteorological parameters were simultaneously measured in five megacities in China in summer 2018. Moderate wind speeds, strong solar radiation and high temperature were observed in all cities, indicating favorable meteorological conditions for local O(3) formation. However, the unusually frequent precipitation caused by typhoons reaching the eastern coastline resulted in the least severe air pollution in Shanghai. The highest O(3) level was found in Beijing, followed by Lanzhou and Wuhan, while relatively lower O(3) value was recorded in Chengdu and Shanghai. Photochemical box model simulations revealed that net O(3) production rate in Lanzhou was the largest, followed by Beijing, Wuhan and Chengdu, while it was the lowest in Shanghai. Besides, the O(3) formation was mainly controlled by volatile organic compounds (VOCs) in most cities, but co-limited by VOCs and nitrogen oxides in Lanzhou. Moreover, the dominant VOC groups contributing to O(3) formation were oxygenated VOCs (OVOCs) in Beijing and Wuhan, alkenes in Lanzhou, and aromatics and OVOCs in Shanghai and Chengdu. Source apportionment analysis identified six sources of O(3) precursors in these cities, including liquefied petroleum gas usage, diesel exhaust, gasoline exhaust, industrial emissions, solvent usage, and biogenic emissions. Gasoline exhaust dominated the O(3) formation in Beijing, and LPG usage and industrial emissions made comparable contributions in Lanzhou, while LPG usage and solvent usage played a leading role in Wuhan and Chengdu, respectively. The findings are helpful to mitigate O(3) pollution in China"
Keywords:		*Air Pollutants/analysis China Cities Environmental Monitoring *Ozone/analysis *Volatile Organic Compounds/analysis Megacity clusters Ozone formation Pbm-mcm Radical chemistry VOCs;
Notes:		"MedlineLiu, Xufei Guo, Hai Zeng, Lewei Lyu, Xiaopu Wang, Yu Zeren, Yangzong Yang, Jin Zhang, Luyao Zhao, Shizhen Li, Jun Zhang, Gan eng Netherlands 2021/08/21 Sci Total Environ. 2021 Dec 20; 801:149603. doi: 10.1016/j.scitotenv.2021.149603. Epub 2021 Aug 12"