The Puritii Air Purification System, like most other electronic appliances, produces a very small amount of ozone that is far below established limits. The Ionizer in the Puritii Air Purification System should not be confused with an ozone generator - the Ionizer produces negatively charged particles (ions), whereas ozone generators produce ozone (O3) in large quanitities that can be irritating to your throat and lungs. The Ionizer is safe to use at all times, whether you are at home or not. See Questions #21 for more information about the Ionizer.
As labeled on the unit and the carton, the 8-hour time weighted average (TWA) ozone emission of the air purifier is 0.001 part per million (or 1 part per billion) when measured in a 30 m3 room. The Underwriters Laboratory Safety Standard 867 and the US Food and Drug Administration (FDA) have established 50 parts per billion as the maximum allowable ozone emissions for medical devices (Puritii is not a medical device). Additionally, the US Environmental Protection Agency (EPA) has set an ozone peak concentration limit at 0.075 parts per million (73 FR 16436). The ozone emission levels of the Puritii Air Purification System and all of its components are well below established limits.