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. 2020 Dec 31;105:103576. doi: 10.1016/j.jdent.2020.103576

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Fig. 5 — Correlations between ventilation alone (ACH_vent) or ventilation plus portable air cleaner (ACH_total) and times needed to 95 % or 100 % removals of the 0.3 μm aerosol particles. Higher ACH_vent is highly correlated with shorter times needed to reach 95 % or 100 % aerosol removal (A, B), but such correlations are weak for ACH_total (C,D).