Thank you for your question. No, this purifier does not emit ozone. For over 100 years it has been our priority and privilege to develop and manufacture high quality small appliances. Please be assured that our products and components meet all government requirements and are FDA and UL approved. They are also tested by independent laboratories to ensure the high quality that is expected of Hamilton Beach brand products. The rigorous tests we employ often exceed the standards set by our government making us a leader in the industry for quality and safety.