I've had a HEPA filtering machine in my home for years, but I always questioned those ozone things, until one day when my questions were answered.
My Guard unit was having an NBC drill and one of the guest speakers was Michael Feeney, an air quality expert and NBC consultant to MEMA (Massachusetts EMA).
Feeney explained just how harmful those "ozone generators," or whatever they are called, can be to human health.
And since then I've steered clear of them...