No, you can't expose people to UV light all day, they will get sunburns, skin cancer and lose their site. Then there is the issue of whether UV light can kill

No, you can't expose people to UV light all day, they will get sunburns, skin cancer and lose their site. Then there is the issue of whether UV light can kill airborne viruses soon enough after being exhaled so they are dead by the time someone else breathes them in.