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. 2015 Sep 29;12(10):12171–12195. doi: 10.3390/ijerph121012171

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© 2015 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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Risk of population exposure to PM2.5 in 2013 in Xi’an, China by month: (a) January; (b) February; (c) March; (d) April; (e) May; (f) June; (g) July; (h) August; (i) September; (j) October; (k) November; (l) December.

Risk of population exposure to PM2.5 in 2013 in Xi’an, China by month: (a) January; (b) February; (c) March; (d) April; (e) May; (f) June; (g) July; (h) August; (i) September; (j) October; (k) November; (l) December.