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- W4387244322 abstract "Far–UVC (222 nm UV–C light) is a promising tool to mitigate aerosol transmission of pathogens indoors. However, recent studies have raised concerns related to ozone (O 3 ) production and secondary chemistry. In this study, we measured indoor O 3 and ultra-fine particle (UFP, 17.5–289 nm) concentrations with and without 222 nm far–UVC (average fluence rate 1.7–1.8 μW/cm 2 ) in a hotel quarantine facility in Baltimore (MD, USA). We obtained nearby outdoor O 3 concentrations from the Environmental Protection Agency (EPA) website. In a sealed empty guest room, the average O 3 concentrations were 3 ppb (UV off, 0.1–0.5 ACH), 16 ppb (UV on, 0.1 ACH) and 9 ppb (UV on, 0.5 ACH). In a standard guest room, the average O3 concentrations were 12 ppb (UV off, 1.4 ACH) and 14 ppb (UV on, 1.4 ACH), and correlated with outdoor concentrations (ρ = 0.65–0.74, p = 2*10 –12 –2*10 –29 . A linear regression model, adjusted for outdoor O 3 , estimated that use of far–UVC lamps increased the O 3 concentration by 5.7 ppb (95% confidence interval (CI) 4.9–6.5 ppb) in the standard hotel room. Indoor O 3 concentrations increased with far–UVC usage, however, the concentrations remained 6–12 ppb lower, on average, than outdoors and well below EPA ambient limits. We did not find a clear relationship between indoor UFP concentrations and UV usage. Although our study was limited by absence of direct outdoor measurements of local O 3 and UFPs, our findings do not support a major impact of far–UVC on UFP concentrations in the real–world environment that we studied." @default.
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- W4387244322 date "2023-10-02" @default.
- W4387244322 modified "2023-10-03" @default.
- W4387244322 title "Ozone and ultra-fine particle concentrations in a hotel quarantine facility during 222 nm far-UVC air disinfection" @default.
- W4387244322 doi "https://doi.org/10.1101/2023.09.29.23296366" @default.
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