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. 2019 Nov 18;9:16998. doi: 10.1038/s41598-019-53103-7

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Monthly mean O₃ (MAD1) concentration in Shanghai and its surrounding areas in the weak WPSH case (Aug. 2016) (a), and the strong WPSH case (Jul. 2017) (b). (The ozone data which is measured by the Urban Air Quality Center in China has been interpolated to a rectilinear grid using bilinear interpolation). The O₃ concentrations were measured by the Chinese National Environmental Monitoring Center (CNEMC) at 367 monitoring stations and were interpolated to grid data by using iterative improvement objective analysis. The maps were generated using NCL software [The NCAR Command Language (Version 6.3.0) [Software]. (2015). Boulder, Colorado: UCAR/NCAR/CISL/TDD. 10.5065/D6WD3XH5].