Figure 5.

Effects of ventilation and GUV₂₂₂ fluence rate on modeled GUV efficacy and indoor air quality (see also Figures S9–S12). Panel A: effective air changes per hour (eACH) for indoor pathogens, based on the previously reported inactivation rate of SARS-CoV-2 at 222 nm⁴⁵ (Section S4.2). Panels B–D: steady-state concentrations of (B) O₃, (C) OH, and (D) organic oxidation products, respectively, as predicted by the photochemical box model. Panel D calculations assume unit yields and do not account for VOC production from surfaces (see Figure S11) or recycling by NO_x–HO_x interactions (Figure S12), so they likely represent lower limits. Lighter colors represent larger values; note that the logarithmic color scaling is different for each panel. Additional model results are given in Figures S9 and S10.