Fig. 6.

(Left axis) Concentration of MS2 in the air at each sampling time point during the control and photocatalytic (PCO1 and PCO2) test experiments, averaged over each type of test, where error bars represent standard deviation from each set of recoveries. (Right axis) Efficacy of the PCO1 and PCO2 devices against aerosolized MS2, calculated as log₁₀ reduction in MS2 recoveries from the control vs. photocatalytic test experiments; statistical significance between control and technology experiments at the sample times is denoted by (*). For recoveries, error bars represent standard deviation in log₁₀ recoveries for each respective set of control and BPI experiments at each sample time; for efficacy, the error bars represent pooled standard error from both the control and technology experiments.