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. 2018 Mar 23;15(4):573. doi: 10.3390/ijerph15040573

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© 2018 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Different facets of population exposure to PM_2.5. (a) Map of population distribution in China on 1 March 2016 (11:00 a.m.). (b) Map of PM_2.5 concentration levels in China on 1 March 2016 (11:00 a.m.). (c) Map of cumulative inhaled PM_2.5 masses in China based on the MPL data on 1 March 2016. (d) Map of cumulative inhaled PM_2.5 in China based on the census data on 1 March 2016. (e–h) show the insets from (a–d) for part of the Northern China.