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. 2014 Mar 19;9(3):e91917. doi: 10.1371/journal.pone.0091917

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© 2014 Zou et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Annual exposure concentrations of census tracts have been utilized to calculate county level mean exposure concentration values, which was used as a ‘relative exposure level’ metric to evaluate benzene pollution exposure inequities. Division 1 is New England; Division 2 is Mid-Atlantic; Division 3 is East North Central; Division 4 is West North Central; Division 5 is South Atlantic; Division 6 is East South Central; Division 7 is West South Central; Division 8 is Mountain; Division 9 is Pacific.