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. 2014 Dec 9;11(12):12739–12766. doi: 10.3390/ijerph111212739

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© 2014 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 license (http://creativecommons.org/licenses/by/4.0/).

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NEXUS study domain, after making adjustments in diesel impact. Interstates (HD) and participants within 150 m of high-traffic/high-diesel (HTHD) roadways are shown in red; freeways (LD) and participants within 150 m of low-diesel/high-traffic roadways are shown in blue; control-group participants >300 m from interstates or freeways are in green; and participants and roadways that were reclassified from HD to LD are shown in magenta.