This is interesting. This might help to protect public area. In any case, it would be a good idea to put some kind of device at the entrance of public areas to expose users to a non-harmful light. We can even use it in the future for some other diseases. I used to disinfect my water from the lake with UV light. It is very effective at 99.9% killing all diseases from water.
>>> “A study conducted by Hiroshima University researchers found that using Ultraviolet C light with a wavelength of 222 nanometers which is safer to use around humans effectively kills SARS-CoV-2 — the first research in the world to prove its efficacy against the virus that causes COVID-19.”