Here's the basics on ozone:
Ozone is O3, the oxygen molecule with an extra molecule. Ozone is unstable and in less than 30 minutes will deteriorate into pure oxygen. But before that, it has the ability to bond with pollutant molecules and "oxydize" or neutralize them.
Ozone can be both a waste product and pollutant, like ozone from older copying machines, or a valuable tool. In high concentrations it can be a disinfectant and eliminate extreme odor. It is used in buildings after fires but no living things are in the area.
In low concentrations ozone is an air purifier and odor eliminator. Nature uses it this way. The odor after a summer storm is ozone and those storms clean the air. As for grow areas, I would not put an ozone gen in a closet with a grow. But I would put it in the room outside. It will do zero harm at the concentrations it is capable of producing. I use one in the room my grow closet is in, and one in the main living area.
If you are buying one check on ebay. Pay attention to how much ozone it generates and get the most per dollar. You can dial it down to whatever you want.