Ozone is bad for you though. How do you manage that?

Edit: Sorry, you did address that.

> no sparks means ozone in too small concentrations to worry about.

Have you actually measured?

No, I just know the mechanism (UV/spark) is missing and the air has no odor of it. I know the smell of O3 because an old boss had one of those cracking sparking monsters that projected blue on the ceiling when the light was off. It blew its power supply in short order and no one suffered ill effects, but no one missed it either.