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. 2014 Nov 1;11:45. doi: 10.1186/s12989-014-0045-5

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© Laumbach et al.; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Box plots showing mean, median, 25th percentile, 75th percentile, and range of concentrations of particle number and PM2.5 concentrations measured inside the respirator (PAPR) facepiece.