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. 2017 Nov 10;7:15329. doi: 10.1038/s41598-017-15295-8

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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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Description of skin aging signs in high indoor PM_2.5 exposure group and low indoor PM_2.5 exposure group in the directly measured samples. The study directly measured the indoor PM2.5 of 30 households, and divided them into high PM_2.5 exposure group (N = 15, annual mean exposure >90 µg/m³) and low PM_2.5 exposure group (N = 15, annual mean exposure ≤90 µg/m³). The wrinkles, laxity and size of pigment spots are normally distributed, and therefore arithmetic means (AM) is given; while number of pigment spots is log-normally distributed, and therefore geometric means (GM) is given. 95% CI is presented. Further skin aging manifestations are presented as occurrence respectively.