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. 2017 Jul 19;3(7):e1700300. doi: 10.1126/sciadv.1700300

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 6 — Each bubble represents an individual city. The areas of the bubbles are proportional to urban population in the city. The shades of the bubbles represent the increase in urban population since 1980. (A) Relationship between the migration-induced change in PM_2.5 exposure concentrations with GDP_cap. (B) Relationship between the migration-induced change in PM_2.5 exposure concentrations with HDD.