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. 2019 Apr 24;18:38. doi: 10.1186/s12940-019-0473-7

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© The Author(s). 2019

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. 2 — The combined effects of two pollutants on mortality, given the level of the remained pollutant fixed as the reference level. Red lines represent the exposure-response relationship between one pollutant and mortality when other two pollutants were fixed as the reference level (i.e. 25th percentile)