there's a danger to everything unfortunately ... every reward comes with a risk.
leaving an o3 generator on while people / pets are present is careless... but using one to oxidize all the bad smells in an enclosed space - a shock treatment works, despite what the government of Connecticut thinks.
ever notice at fast food restaurants, usually in the kitchen, there's a purple-blue fluorescent bulb (UV) tucked away inside of a covering of some sort? that's an industrial o3 generator, it's burning up all the fat/oil molecules floating around in the air from the fryer / grill. places that don't have em stink like used grease as soon as you walk in the door.