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. 2018 Apr 20;7:18003. doi: 10.1038/lsa.2018.3

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Copyright © 2018 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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One-month data for PM_1.0 measured by the size spectrometer. The size distribution (a) and the mass concentration (b) of the particulate matter from 11 December 11 2015 to 12 January 2016. The symbols and the solid curve indicate the experimental PM_1.0 data and the official PM_2.5 data reported by Beijing Municipal Environmental Monitoring Center. The error bars indicate the standard deviation.