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. 2022 Jul 18;19(14):8732. doi: 10.3390/ijerph19148732

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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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RD plot for PM₁₀. Note: The figure plots the binned averages of county-level PM₁₀ concentrations against the running variable. The solid line represents a quartic polynomial fit of PM₁₀ on each side of the threshold.