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. 2022 Nov 12;227:109804. doi: 10.1016/j.buildenv.2022.109804

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Fig. 2 — Normalized MS2 recoveries at each sampling time point throughout the control and bipolar ionization (BPI) tests with the device active. Each time point represents recovery of MS2 from duplicate bioaerosol samples as determined by plaque assay, and the error bars represent pooled standard deviation from triplicate sample plating of duplicate bioaerosol samples for each sampling time point. Data from each sampling time point are normalized to the initial sample recovery at time = 0 min for each individual test.