Title: | "Causes of ozone pollution in summer in Wuhan, Central China" |
Author(s): | Zeng P; Lyu XP; Guo H; Cheng HR; Jiang F; Pan WZ; Wang ZW; Liang SW; Hu YQ; |
Address: | "School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China. Electronic address: ceguohai@polyu.edu.hk. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, China. Electronic address: chenghr@whu.edu.cn. International Institute for Earth System Science, Nanjing University, Nanjing 210023, China. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, China. Wuhan Environment Monitoring Center, Wuhan 430022, China" |
DOI: | 10.1016/j.envpol.2018.05.042 |
ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
Abstract: | "In August 2016, continuous measurements of volatile organic compounds (VOCs) and trace gases were conducted at an urban site in Wuhan. Four high-ozone (O(3)) days and twenty-seven non-high-O(3) days were identified according to the China's National Standard Level II ( approximately 100?ª+ppbv). The occurrence of high-O(3) days was accompanied by tropical cyclones. Much higher concentrations of VOCs and carbon monoxide (CO) were observed on the high-O(3) days (p?ª+ª+0.01). Model simulations revealed that vehicle exhausts were the dominant sources of VOCs, contributing 45.4?ª++/-?ª+5.2% and 37.3?ª++/-?ª+2.9% during high-O(3) and non-high-O(3) days, respectively. Both vehicle exhausts and stationary combustion made significantly larger contributions to O(3) production on high-O(3) days (p?ª+ª+0.01). Analysis using a chemical transport model found that local photochemical formation accounted for 74.7?ª++/-?ª+5.8% of the daytime O(3), around twice the regional transport (32.2?ª++/-?ª+5.4%), while the nighttime O(3) was mainly attributable to regional transport (59.1?ª++/-?ª+9.9%). The local O(3) formation was generally limited by VOCs in urban Wuhan. To effectively control O(3) pollution, the reduction ratio of VOCs to NO(x) concentrations should not be lower than 0.73, and the most efficient O(3) abatement could be achieved by reducing VOCs from vehicle exhausts. This study contributes to the worldwide database of O(3)-VOC-NO(x) sensitivity research. Its findings will be helpful in formulating and implementing emission control strategies for dealing with O(3) pollution in Wuhan" |
Keywords: | "Air Pollutants/*analysis Carbon Monoxide/analysis China *Environmental Monitoring Environmental Pollution/analysis Models, Chemical Ozone/*analysis Photochemical Processes Seasons Vehicle Emissions/analysis Volatile Organic Compounds/analysis Control meas;" |
Notes: | "MedlineZeng, P Lyu, X P Guo, H Cheng, H R Jiang, F Pan, W Z Wang, Z W Liang, S W Hu, Y Q eng England 2018/06/19 Environ Pollut. 2018 Oct; 241:852-861. doi: 10.1016/j.envpol.2018.05.042. Epub 2018 Jun 15" |