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Ozone Pollution and Its Response to Nitrogen Dioxide Change from a Dense Ground-Based Network in the Yangtze River Delta: Implications for Ozone Abatement in Urban Agglomeration

He, Zhonghua and He, Yue and Fan, Gaofeng and Li, Zhengquan and Liang, Zhuoran and Fang, He and Zeng, Zhao-Cheng (2022) Ozone Pollution and Its Response to Nitrogen Dioxide Change from a Dense Ground-Based Network in the Yangtze River Delta: Implications for Ozone Abatement in Urban Agglomeration. Atmosphere, 13 (9). Art. No. 1450. ISSN 2073-4433. doi:10.3390/atmos13091450.

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Understanding the response of tropospheric ozone (O₃) to nitrogen dioxide (NO₂) change is important for local O₃ control. The relationship between O₃ and NO₂ at county scale in China has been extensively studied using models, but there is a lack of results from direct measurements. In this study, we used measurements of O₃, NO₂ and meteorological conditions from a dense network in the Yangtze River Delta (YRD), and satellite observed formaldehyde (HCHO) and NO₂ column densities for the analysis of O₃ variabilities and its relationship to NO₂. As a result, severe O₃ pollution occurred mainly in Shanghai city, southern Jiangsu and northern Zhejiang provinces in YRD during April–September. In addition, meteorological conditions could explain 54% the diurnal O₃ variation over YRD. During April–September 2015–2021, O₃ showed a significant positive relationship (r = 0.61 ± 0.10) with NO₂ after removing the impact from meteorological conditions. However, the relationship could be reversed with NO₂ concentration change. Our result suggested that the controllable O₃ related to NO₂ change is up to 100 μg·m⁻³ in megacities over Shanghai and northern Zhejiang province. The O₃ is much more sensitive to the NO₂ reduction in megacities than surrounding areas. Our results evaluate the different impacts of NO₂ changes on O₃ formation, which provides explanation for the simultaneously alleviated O₃ pollution and reduced NO₂ in 2020 in Shanghai and northern Zhejiang, as well as the increased O₃ in most counties before 2019 with reduced NO₂ during October–March. The driving mechanism as revealed from this study for O₃ and NO₂ will be valuable for the O₃ abatement through NO₂ reduction at sub-county scale over YRD in China.

Item Type:Article
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URLURL TypeDescription
Li, Zhengquan0000-0001-9663-6406
Zeng, Zhao-Cheng0000-0002-0008-6508
Additional Information:This research was funded by the National Natural Science Foundation of Zhejiang Province (Nos. LQ21d050001), Hangzhou Agriculture and Social development research project (Nos. 20201203B155), Science and Technology of Zhejiang Meteorological Bureau (Nos. 2021ZD09 and 2021YB07). The authors sincerely thank the Zhejiang Ecological and Environmental Monitoring Center (, accessed on 2 September 2022) for providing the dense measurements of ozone and precursors, and the National Meteorological Science Data Center (, accessed on 2 September 2022) for providing meteorological data.
Funding AgencyGrant Number
Science and Technology Department of Zhejiang ProvinceLQ21d050001
Hangzhou Science and Technology Bureau20211203B155
Zhejiang Meteorological Bureau2021ZD09 and 2021YB07
Issue or Number:9
Record Number:CaltechAUTHORS:20220930-482429300.4
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117190
Deposited By: Melissa Ray
Deposited On:04 Oct 2022 14:16
Last Modified:04 Oct 2022 14:16

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