text: It definitely produces ozone. We have it in a bathroom where the cat box is, and that is the only reason we got it: to deal with those odors, which it does easily. It produces far more that needed for that job. Which would be OK, I figure the excess will get pulled out by the central vent system that is in a nearby hallway, and be spread through the rest of the house and possibly give some benefits. But sometimes when going in that room, the ozone smell is a bit excessive. But, it does produce ozone, just like it says. And it is adjustable, but I would prefer it could be turned down a bit more.