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. 2017 Jun 3;90(7):713–724. doi: 10.1007/s00420-017-1234-y

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© The Author(s) 2017

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.

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Fig. 1 — Distribution of benzene (a) and 1,3-butadiene (b) concentrations in samples from workers at Refinery 1 and 2 divided into five concentration ranges. The first bar represents the percentage of samples below the limit of detection (LOD) for benzene, of 5 µg/m³ and 1,3-butadiene, of 1 µg/m³