Ozone treatment

What it means

Ozone generators produce ozone gas on purpose. Restorers sometimes use high-output units in empty buildings to treat smoke, mold or other odors. The same technology is sold to consumers as “air purifiers.”

EPA is direct about the risk: “Whether in its pure form or mixed with other chemicals, ozone can be harmful to health.” EPA says ozone at levels that do not exceed public health standards has little potential to remove indoor air contaminants. It does not effectively remove viruses, bacteria, mold or other biological pollutants at those levels. The California Air Resources Board strongly advises against using ozone generators at home.

Why it matters to your health and your home

If a company proposes ozone, it should mean everyone, including pets and plants, is out of the home during treatment and until the ozone has cleared. EPA says ozone use is appropriate only when people are not present and conditions are controlled so no one is exposed. Ozone can also damage some materials. It does not replace cleaning, and it does not solve a mold problem, since mold needs moisture removal and physical cleanup. EPA’s duct cleaning guidance also notes controversy over introducing ozone into ductwork. Ask for the treatment plan in writing. See smoke odor removal.