William Rose wrote:

When does the ozone generator get used? Hopefully not when there is
anybody in the tub. In commercial use, respirators and maximum
ventilation are required. It protects us from ultra-violet but turns
tires into dust. You do not want to breath it.

- Bill
Cloribus gustibus non disputatum (but, not when it comes to breathing
ozone. Don't do it.)

Ozone water systems are quite common in spas and hot tubs. No health
alarms have been sounded over them that I'm aware of?