Pretty counterintuitive that in order to make UV less dangerous for humans, you can make it more ionizing. Anyway, I'd expect problems with degradation/yellowing of plastics, bleaching of everything in range, and massive issues with indoor ozone and some other forms of air pollution
Because people are morons who will snort straight asbestos because some quack said it is healthy for them.
Ozone is super unstable and will oxidize most organic compounds. It's great in the upper atmosphere where it absorbs deadly UV rays, but it is super dangerous to be inhaling regularly.