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. 2018 Mar 27;17:30. doi: 10.1186/s12940-018-0373-2

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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 — Modelled PM_2.5 isoconcentration contours (μg/m³), five years average exposure (2008–2012) without background concentration (map reprinted from Kadaster [28] in the Netherlands under a CC-BY-4.0 license, 2017)