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. 2022 May 14;306:119469. doi: 10.1016/j.envpol.2022.119469

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Fig. 3 — The odds ratio (95% confidence interval) of (A) SpO₂ < 90% at admission, (B) need for oxygen therapy, (C) mechanical ventilation, and (D) death in relation to exposure to air pollution parameters (mean and max 24 h levels of PM₁₀, PM_2.5 and B(a)P) exceeding limits during a week before hospitalization in the studied group of COVID-19 patients hospitalized in Poland.