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. 2014 Mar 24;13:21. doi: 10.1186/1476-069X-13-21

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Copyright © 2014 Pollard et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), 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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Median indoor CO concentrations by hour of the day. Curves are stratified by site and chimney construction (urban, rural with chimney, and rural without chimney). The y-axis represents median values of indoor CO (ppm) across households. We calculated these household summaries for each hour of the day, as indicated on the x-axis.