I thought ozone was only bad at high atmosphere ? :dunno
Actually the opposite. In the stratosphere (high altitude) ozone is beneficial because it absorbs UV radiation.
In the troposphere, ozone is problematic. It is a strong oxidizer, and it is linked to a variety of respiratory diseases and can promote cancer. It also contributes to smog by reacting with gaseous organic compounds and nitrogen oxides.
People buy ozonators to reduce odors. Odor compounds typically contain carbon-carbon double bonds, which are readily broken by ozone. At the site of breakage, ther is an incorporation of oxygen, whose polarity and weight often cause the reaction products to fall out of the gas phase, so they don't smell. This does reduce odors, but it does this by chemical reaction, the same reaction that will kill cannabinoids at the surface of the plant. The gaseous reaction products from the odor end up in your carpet. Ozone does have some industrial applications, but people using it in the home or for pot growing are doing it wrong IMO.