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. 2018 Mar 14;15:13. doi: 10.1186/s12989-018-0249-1

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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. 2 — The proportion of PAH with different numbers of benzene rings in F1 (a) and F2 (b). The proportion of PAHs with two to six benzene rings was determined; the proportions of BAP, IND and DBA with five benzene rings, which may be associated with more severe toxicity, are also listed separately at the side