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. 2019 Apr 29;9:6635. doi: 10.1038/s41598-019-43104-x

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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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(a–e) Long-term variations in PM_2.5 concentration. The horizontal black dashed line identifies the PM_2.5 concentration at 35 μg m⁻³, black lines denote the mean PM_2.5 concentration, and red lines denote the daily mean PM_2.5 concentration >35 μg m⁻³. Gray bars indicate the number of days with a daily mean PM_2.5 concentration >35 μg m⁻³. (f) Annual wind speed comparison between the mean wind speed and the wind speed associated with daily mean PM_2.5 concentrations >35 μg m⁻³.