While useful for killing pathogens including SARS-CoV-2, 222-nanometer UV lights may produce harmful compounds in indoor spaces, and should be used with ventilation, MIT researchers have found.
Significant Production of Ozone from Germicidal UV Lights at 222 nm
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Germicidal UV lights could be producing indoor air pollutants, study finds
Germicidal UV Lights May Produce Indoor Air Pollutants : r/Futurology