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. 2022 Jan 28;19(3):1522. doi: 10.3390/ijerph19031522

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Diagram of policy impacts with intervention points along the progression of PM_2.5 from sources to health impacts. The intervention points (green arrows) are numbered by letters according to the order of the identified research priorities (1–4), with point A corresponding to priorities 1 and 2, point B to 3, and point C to 4. Black solid arrows indicate the PM_2.5 progression from sources to health impacts. Black dash arrows indicate policies that impact or are being impacted upon.