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. 2017 Aug 15;7:8220. doi: 10.1038/s41598-017-08895-x

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© The Author(s) 2017

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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Effects of emission reduction measures on PM_2.5 concentrations during two red alerts (P _contrib, C and C _base are the contribution rate of emission reduction to PM_2.5 concentrations, the simulated PM_2.5 concentration under the emission reduction scenario and simulated PM_2.5 concentration in baseline scenario respectively).