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. 2022 Feb 4;6(1):e195. doi: 10.1097/EE9.0000000000000195

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Copyright © 2022 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of The Environmental Epidemiology. All rights reserved.

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Figure 1. — Adjusted exposure-response curves for county-level measures of PM_2.5 and cumulative COVID-19 mortality (solid lines) and 95% CIs (shaded areas) using natural cubic spline models with 3 df, for three different time periods. Models were adjusted, using natural cubic spline functions, for county-level measures of smoking, population density, older population, hospital beds, median household income, poverty, summer temperature, mean body mass index, and percentage of population that is White, Hispanic, Asian, White, and Black. For the June 2021 analysis, the model included the county-level proportion of fully vaccinated persons. Note the different scales for the y axes in the different plots. A, Cumulative deaths until end of June 2020; B, Cumulative deaths until end of December 2020; and C, Cumulative deaths until end of June 2021.