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J Environ Sci (China)

Title:		"Characteristics of one-year observation of VOCs, NOx, and O(3) at an urban site in Wuhan, China"
Author(s):		Yang Y; Liu X; Zheng J; Tan Q; Feng M; Qu Y; An J; Cheng N;
Address:		"School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. Electronic address: liuxingang@bnu.edu.cn. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. Electronic address: zheng.jun@nuist.edu.cn. Chengdu Academy of Environmental Sciences, Chengdu 610072, China. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. Beijing Municipal Environmental Monitoring Center, 100048 Beijing, ,China"
Journal Title:		J Environ Sci (China)
Year:		2019
Volume:		20181217
Issue:
Page Number:		297 - 310
DOI:		10.1016/j.jes.2018.12.002
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"A continuous online observation of ozone and its precursors (NOx, VOCs) was carried out in central urban Wuhan from September 2016 to August 2017. The concentration levels of ozone, NOx, VOCs and their variations in urban Wuhan were analyzed, as well as effects of VOCs on ozone photochemical generation and the main controlling factors for ozone production. During the observation period, the average concentrations of ozone and NOx in Wuhan was 22.63 and 30.14?ª+ppbv, respectively, and the average concentration of VOCs was 32.61?ª+ppbv (42.3% alkanes, 13.0% alkenes, 10.0% aromatics, 7.3% acetylene, 9.9% OVOCs, and 10.5% halohydrocarbons). Ozone concentration was higher in spring and summer as compared with autumn and winter, wheras VOCs and NOx concentratios were lower in spring and summer but higher in autumn and winter. Aromatics and alkenes, two of VOCs species, showed the highest contributions to ozone formation potential in Wuhan (35.7% alkenes, 35.4 aromatics, 17.5% alkanes, 8.6% OVOCs, 1.6% halogenated hydrocarbons, and 1.4% acetylene). Among all VOCs species, those with the highest contribution were ethylene, m-xylene, toluene, propylene and o-xylene. The contribution of these five compounds to the total ozone formation potential concentration was 43.90%. Ozone-controlling factors in Wuhan changed within one day; during the early morning hours (6:00-9:00), VOCs/NOx was low, and ozone generation followed a VOCs-limited regime. However, during the peak time of ozone concentration (12:00-16:00), the ratio of VOCs/NOx was relatively high, suggesting that ozone generation followed a NOx-limited regime"
Keywords:		Air Pollutants/*analysis China Cities Environmental Monitoring Hydrocarbons/*analysis Nitrogen Oxides/*analysis Ozone/*analysis/chemistry Seasons Volatile Organic Compounds/*analysis Ozone NOx VOCs variation Ozone formation mechanism VOCs chemical charact;
Notes:		"MedlineYang, Yichang Liu, Xingang Zheng, Jun Tan, Qinwen Feng, Miao Qu, Yu An, Junling Cheng, Nianliang eng Netherlands 2019/02/21 J Environ Sci (China). 2019 May; 79:297-310. doi: 10.1016/j.jes.2018.12.002. Epub 2018 Dec 17"