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. 2018 Jul 18;40:14. doi: 10.1186/s41021-018-0102-7

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Concentrations of interleukin (IL)-8 (a) and IL-6 (b) in the supernatants of THP1 cells stimulated by collected particulate matter (PM) dissolved in solution (1 μg/mL) with and without bubbling through ozone. Bars represent means ± SD. *P < 0.01 and **P < 0.05