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. 2020 Apr 7;8:107. doi: 10.3389/fpubh.2020.00107

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Copyright © 2020 Brouwer and Rees.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Plot of the AM (yellow bars) and GM (blue bars) of personal coal dust concentrations of 21 HEGs with > 15 data points. Data (N = 684) were collected from 6 coal mines in 2015.