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. 2020 Sep 23;8:575946. doi: 10.3389/fpubh.2020.575946

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Copyright © 2020 Roe, Mondschein, Neale, Barnes, Boukhechba and Lopez.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Heart rate variability (RMSSD) by “green” vs. “gray” condition over observed values of dB and PM_2.5 Note: a lower heart rate variability indicates higher cardiac activation and higher stress.