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.
Why You Should Invest in a HEPA UV Air Purifier
Keep allergens, viruses, and other air pollutants out of your home. - Hoffman Energy
UV Germicidal Lights Sheldon's Air Conditioning & Heating
UV Light AC Expert
Indoor Air Quality⎮ UV Lights
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Do UV Lights Improve Indoor Air Quality?
Germicidal UV: a tradeoff between disinfection and indoor smog
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The Various Uses for UV Light - LightSources
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Germicidal UV could contribute to indoor air pollution - HVAC&R News
Germicidal UV lamps: A trade-off between disinfection and air quality - American Chemical Society
Germicidal UV Lights May Produce Indoor Air Pollutants : r/Futurology