| Title: | "Characteristics of ozone pollution and the sensitivity to precursors during early summer in central plain, China" |
| Author(s): | Li Y; Yin S; Yu S; Bai L; Wang X; Lu X; Ma S; |
| Address: | "Research Institute of Environmental Science College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, China. Research Institute of Environmental Science College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, China. Electronic address: shashayin@zzu.edu.cn. Henan Environmental Monitoring Center, Zhengzhou, 450004, China" |
| DOI: | 10.1016/j.jes.2020.06.021 |
| ISSN/ISBN: | 1001-0742 (Print) 1001-0742 (Linking) |
| Abstract: | "In this study, we conducted an observation experiment from May 1 to June 30, 2018 in Zhengzhou, a major city in central China, where ground ozone (O(3)) pollution has become serious in recent years. The concentrations of O(3) and its precursors, as well as H(2)O(2) and meteorological data were obtained from the urban site (Yanchang, YC), suburban (Zhengzhou University, ZZU) and background sites (Ganglishuiku, GLSK). Result showed that the rates of O(3) concentration exceeded Chinese National Air Quality Standard Grade II (93.3 ppbv) were 59.0%, 52.5%, and 55.7% at the above three sites with good consistency, respectively, indicating that O(3) pollution is a regional problem in Zhengzhou. The daily peak O(3) appeared at 15:00-16:00, which was opposite to VOCs, NO(x), and CO and consistent with H(2)O(2). The exhaustive statistical analysis of meteorological factors and chemical effects on O(3) formation at YC was advanced. The high concentration of precursors, high temperature, low relative humidity, and moderately high wind speed together with the wind direction dominated by south and southeast wind contribute to urban O(3) episodes in Zhengzhou. O(3) formation analysis showed that reactive alkenes such as isoprene and cis-2-butene contributed most to O(3) formation. The VOCs/NO(x) ratio and smog production model were used to determine O(3)-VOC-NO(x) sensitivity. The O(3) formation in Zhengzhou during early summer was mainly under VOC-limited and transition regions alternately, which implies that the simultaneous emission reduction of alkenes and NO(x) is effective in reducing O(3) pollution in Zhengzhou" |
| Keywords: | *Air Pollutants/analysis *Air Pollution China Cities Environmental Monitoring Hydrogen Peroxide *Ozone/analysis *Volatile Organic Compounds/analysis H(2)o(2) Meteorological influences O(3)-VOC-NO(x) Ozone formation potential Smog production model; |
| Notes: | "MedlineLi, Yasong Yin, Shasha Yu, Shijie Bai, Ling Wang, Xudong Lu, Xuan Ma, Shuangliang eng Netherlands 2020/11/14 J Environ Sci (China). 2021 Jan; 99:354-368. doi: 10.1016/j.jes.2020.06.021. Epub 2020 Jul 28" |
