Ground-Level Ozone Production over an Industrial Cluster of China: a Box Model Analysis of a Severe Photochemical Pollution Episode
Xue Yang 1,2
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College of Municipal and Environmental Engineering, Shandong Jianzhu University, Ji’nan 250101, China
Shandong Jinan Ecological Environment Monitoring Center, Ji’nan 250101, China
Shandong Zibo Ecological Environment Monitoring Center, Zi’bo 255040, China
Submission date: 2021-06-18
Final revision date: 2021-09-27
Acceptance date: 2021-10-21
Online publication date: 2022-02-14
Publication date: 2022-03-22
Pol. J. Environ. Stud. 2022;31(2):1885–1899
To better understand the characteristics and processes of ozone formation over the industrial cluster of China, intensive field measurements of atmospheric O3, volatile organic compounds (VOCs), and related parameters were conducted in a typical industrialized city of China, Zibo, from July 1 to July 31, 2018. Monitoring data and comparison with other observations revealed severe O3 pollution in Zibo with high frequency (~55%) of the non-attainment O3 episodes and high average O3 levels (~42 ppbv). An observation-constrained chemical box model (OBM) was deployed to dissect the O3 formation mechanism and ozone-precursor relationship during a severe photochemical smog episode. O3 was produced by NO + HO2 and NO + RO2 reaction and destroyed via the NO2 + RO2 and NO2 + OH reaction. The observed O3 pollution was dominated by intense in-situ O3 chemical formation with regional transport playing a negative contribution. Sensitivity studies suggested that in situ O3 production was in a VOC-limited or mixed-control regime with aromatics (mainly 1,3,5-Trimethylbenzene and toluene) being the dominant parent hydrocarbons of O3. The OBM and positive matrix factorization (PMF) results indicated that the most efficient way to alleviate the O3 pollution in Zibo is to reduce emissions of aromatics from solvent use, industrial processes and vehicles.