Acapella Plasma Tweeter: Dangerous ozone or not?

lots of references to the ozone it produces but nothing factually scientific about safety. I think has converter but does anyone know if the ozone it produces is health hazzard.
appreciate info or links.
One of the many nice things about the Acapella speakers is that they have succeeded in taking care of the ozone problem by converting it in the combustion chamber. Note that I have owned a pair for a number of years and can tell you from personal experience that there is no problem.