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. 2016 Nov 3;15:102. doi: 10.1186/s12940-016-0184-2

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© The Author(s). 2016

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. 2 — Mean asthma exacerbations per person per year within quintiles of each traffic metric. Traffic density units are traffic counts per square meter per day, and VKT units are vehicle kilometers traveled per day