Health

Long wave ultraviolet aka black light is safe but ineffective against viruses

Short wave ultraviolet light is effective but can damage your eyes.

Having everyone using short ultraviolet is not smart. You either use filtering through having it expose objects in a closed container or by passing air past it where you can't see the light directly as people have mentioned. Using direct ultraviolet light should be left to trained people wearing protective eye gear to filter out the rays and know not to make it directly shine on them.