i never breath the ozone fumes. i either put the glass out on the ledge, outside the window, or i put a fan next to the glass pointing out the window. a small amount won't hurt you, but toomuch will burn your lungs. i have accidently breathed in toomuch ozone gas and it wasn't a good thing. felt congested and heavy-chested. i got over it, it didn't cause any permanent damage or anything. but my personal opinion is that its best not to breath it.
the ozone air machines output the ozone in small amounts so that fine. but the machines used for ozonating water put out much higher concnetrations, too high to be breathing if you ask me.