Worried about Ozone Levels? You needn’t be, as this (GPS) Plasma Ionization Purification System is the only ionization system to be classified as Ozone Free: UL 2998 Ozone Fee Certification. And is UL 867 compliant. This plasma ionization system is but 1/7th of the allowable ASHRAE limit; less than what you are breathing at home, less than what is found naturally in the atmosphere! Exceeds IAQ & EPA standards. The patented technology (28 patents) is used in Major Airports, Hospitals, Schools, Veterinarian Clinics, Agriculture, and many American homes—e.g., Sky Harbor Intl. Airport, Boston Children’s Hospital, Mayo Clinic, Houston Memorial Hospital at Baylor, Clemson University, Harvard University, to name but a few institutions utilizing the Plasma Ionization Purification Process.