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Title: Causes of a continuous summertime O-3 pollution event in Jinan, a central city in the North China Plain
Authors: Lyu, XP 
Wang, N
Guo, H 
Xue, LK
Jiang, F
Zeren, YZ 
Cheng, HR
Cai, Z
Han, LH
Zhou, Y
Issue Date: 2019
Source: Atmospheric chemistry and physics, 2019, v. 19, no. 5, p. 3025-3042
Abstract: In the summer of 2017, measurements of ozone (O-3) and its precursors were carried out at an urban site in Jinan, a central city in the North China Plain (NCP). A continuous O-3 pollution event was captured during 4-11 August, with the maximum hourly O-3 mixing ratio reaching 154.1 ppbv. Model simulation indicated that local photochemical formation and regional transport contributed 14.0 +/- 2.3 and 18.7 +/- 4.0 ppbv h(-1), respectively, to the increase in O-3 during 09:00-15:00 LT (local time) in this event. For local O-3 formation, the calculated OH reactivities of volatile organic compounds (VOCs) and carbon monoxide (CO) were comparable between O-3 episodes and non-episodes (p > 0.05), so was the OH reactivity of nitrogen oxides (NOx). However, the ratio of OH reactivity of VOCs and CO to that of NOx increased from 2.0 +/- 0.4 s(-1) s(1) during non-episodes to 3.7 +/- 0.7 s(-1) s(1) during O-3 episodes, which resulted in the change in the O-3 formation mechanism from the VOC-limited regime before the O-3 pollution event to the transitional regime during the event. Correspondingly, the simulated local O-3 production rate during the event (maximum: 21.3 ppbv h(-1)) was markedly higher than that before the event (p < 0.05) (maximum: 16.9 ppbv h(-1)). Given that gasoline and diesel exhaust made large contributions to the abundance of O-3 precursors and the O-3 production rate, constraint on vehicular emissions is the most effective strategy to control O-3 pollution in Jinan. The NCP has been confirmed as a source region of tropospheric O-3, where the shift in regimes controlling O-3 formation like the case presented in this study can be expected across the entire region, due to the substantial reductions of NOx emissions in recent years.
Publisher: Copernicus GmbH
Journal: Atmospheric chemistry and physics 
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-19-3025-2019
Rights: © Author(s) 2019. This work is distributed underthe Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
The following publication Lyu, X., Wang, N., Guo, H., Xue, L., Jiang, F., Zeren, Y., Cheng, H., Cai, Z., Han, L., and Zhou, Y.: Causes of a continuous summertime O3 pollution event in Jinan, a central city in the North China Plain, Atmos. Chem. Phys., 19, 3025-3042 is available at https://dx.doi.org/10.5194/acp-19-3025-2019
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