“ULTRAVIOLET LIGHT HAS A LONG HISTORY AS A DISINFECTANT AND THE SARS-COV-2 VIRUS, which causes Covid-19, is readily rendered harmless by UV light. The question is how best to harness UV light to fight the spread of the virus and protect human health as people work, study, and shop indoors.”
https://www.inverse.com/science/ultraviolet-light-can-make-indoor-spaces-safer-during-the-pandemic