There's two types of UV Air Filters, based on UV-A and UV-C. UV-A systems don't produce much ozone (but sometimes the bulbs are imperfect and produce a trace am

There's two types of UV Air Filters, based on UV-A and UV-C. UV-A systems don't produce much ozone (but sometimes the bulbs are imperfect and produce a trace amount). Ozone is produced by ultraviolet light in the 160–240nm range, meaning UV-C. If you have a UV-C based UV Filter I wouldn't call that ideal but at least you're still receiving less than a ozone generator or even an ioniser both of which would produce higher ozone levels. You may still wish to crack a window occasionally and look at a HEPA filter next major upgrade cycle.