There is a wide divergence of opinion regarding ozone. According to many, the gov't sites you recommend are NOT the reliable sources that you apparently consider them to be. Of course, neither are the site of those selling ozonators!!!
There is definitely a risk from being chronically exposed to too much ozone. It has irritated my lungs temporarily if I have spent many hours in a room with an ozone generator set too high. The solution is to TURN IT DOWN! Unless one is VERY WEALTHY, operating HEPA/carbon filter/s 24/7 is not a sustainable expense. Ozone works for minor to medium duty odors, and the others are affordable if for emergency use only. Those with severe asthma or something like COPD would need to be much more cautious than most in order to use ozone, and may decide the extra expense for the other filters is worth it in their case.
However, in the case the setting was commercial. There are high power ozone cleaners that can briefly supple a dose of ozone to clear the air whilst the space is not occupied. They are used regularly in fire and flood remediation. Some of these are also able to supply a safe lower background supply as well.
A tolerable background dose of ozone as well as HEPA/carbon filters is a very effective combination. The ozone generator is MUCH cheaper to operate, so it is on 24/7. When there is an especially bad event, I add one or two HEPA/carbon filters for the duration of the event. This procedure has helped me survive a neighbor who burns toxic trash, leaving the smoke to accumulate in my yard and seep into my home. This has changed horribly stinky and absolutely intolerable to absolutely fine, no smell, no symptoms. Previously, I would have had a migraine within 20-30 minutes of when the smoke started showing up, even if i were sheltering in a closed house!
So, if one uncritically accepts the gov't party line, use HEPA/carbon filters only and incur an extra 3-6 hundred a year or more in expense. If you can not or do not want to do that, the option I mentioned works and is safe for most, if not all.
BTW, are you just passing on second hand info, or have you actually used ozone b4????
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