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. 2017 Jan 21;14(1):100. doi: 10.3390/ijerph14010100

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© 2017 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Box plots of BTEX, alkane, terpene, formaldehyde, and TTVOC concentrations indoors and outdoors by community type: no-local emission source or clear (C), road (R), and industrial (I). Plots show 5th, 25th, 50th, 75th and 95th percentile concentrations. Diamond (♦) denotes mean. Asterisk (x) denotes outliers.