| Title: | [Analysis of a Typical Ozone Pollution Process in Guangzhou in Winter] |
| Author(s): | Pei CL; Xie YT; Chen X; Zhang T; Qiu XN; Wang Y; Wang ZH; Li M; |
| Address: | "State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. Center for Excellence in Deep Earth Science, Chinese Academy of Sciences, Guangzhou 510640, China. University of Chinese Academy of Sciences, Beijing 100049, China. Guangzhou Sub-branch of Guangdong Ecological and Environmental Monitoring Center, Guangzhou 510060, China. Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou 510632, China. Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 510632, China. Guangzhou Hexin Instrument Co., Ltd., Guangzhou 510530, China. Guangdong Ecological and Environmental Monitoring Center, Guangzhou 510308, China. Jinan University Institute for Environmental and Climate Research, Guangzhou 510632, China. Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510650, China" |
| DOI: | 10.13227/j.hjkx.202110168 |
| ISSN/ISBN: | 0250-3301 (Print) 0250-3301 (Linking) |
| Abstract: | "This study focused on an ozone pollution event occurring in winter (January) in Guangzhou. Various influencing factors were analyzed, including various atmospheric trace gases, meteorological conditions during the whole pollution process, as well as the characteristics of the main O(3) precursor volatile organic compounds (VOCs). The main sources of VOCs and the O(3) formation regime were analyzed using an array of tools:the ozone potential formation (OFP), positive matrix factorization (PMF) model, and empirical kinetic modeling approach (EKMA) curve. Feasible strategies for O(3) control were suggested. The results showed that O(3) and NO(2) exceeded the corresponding standards in this winter pollution event, when the concentrations of PM(10) and PM(2.5) were also high, differing from the air pollution characteristics in summer and autumn. Low boundary layer height (<75 m) and high atmospheric stability at night exacerbated the accumulation of ozone precursors and fine particles. Meteorological conditions such as the increased daytime temperature (5?SG), stronger solar radiation (10%), and low horizontal wind speed (<1 m.s(-1)) favored photochemical reactions and promoted the formation of ozone and fine particles. VOCs were mainly composed of alkanes, and the proportions of alkanes and alkynes in winter were higher than those in the other seasons. Aromatics (xylenes and toluene) and propylene were the key VOCs species leading to O(3) formation. The main VOCs sources were vehicle exhaust (22.4%), solvent usage (20.5%), and industrial emissions (17.9%); however, the source with highest OFP was identified as solvent usage. O(3) formation in this event was in the VOCs-limited regime, and reducing O(3) precursors in the VOCs/NO(x) ratio of 3:1 was effective and feasible for O(3) control. This study explored the causes of an O(3) pollution event in winter, which will serve as reference for the synergistic control of O(3) and PM(2.5) in heavy pollution seasons" |
| Keywords: | *Air Pollutants/analysis Alkanes/analysis Alkynes/analysis China Environmental Monitoring Nitrogen Dioxide/analysis *Ozone/analysis Particulate Matter/analysis Seasons Solvents/analysis Toluene/analysis *Volatile Organic Compounds/analysis Xylenes Guangzh; |
| Notes: | "MedlinePei, Cheng-Lei Xie, Yu-Tong Chen, Xi Zhang, Tao Qiu, Xiao-Nuan Wang, Yu Wang, Zai-Hua Li, Mei chi China 2022/10/13 Huan Jing Ke Xue. 2022 Oct 8; 43(10):4305-4315. doi: 10.13227/j.hjkx.202110168" |
