

This information is based on the most credible scientific evidence currently available.

The purpose of this document is to provide accurate information regarding the use of ozone-generating devices in indoor occupied spaces. For almost a century, health professionals have refuted these claims (Sawyer, et. Often the vendors of ozone generators make statements and distribute material that lead the public to believe that these devices are always safe and effective in controlling indoor air pollution. Ozone generators that are sold as air cleaners intentionally produce the gas ozone. The air cleaner certification program is known as AC-1. AHAM conducts four certification programs for each category - room air cleaners, room air conditioners, dehumidifiers and refrigerator/freezers. If you need information on specific devices or manufacturers, one resource you can consult is the Association of Home Appliance Manufacturers (AHAM), (202) 872-5955. The Agency does not recommend air cleaning devices or manufacturers. Please Note: EPA does not certify air cleaning devices. The display of this number does not imply EPA endorsement or suggest in any way that EPA has found the product to be either safe or effective. This number helps EPA identify the specific facility that produces the product. Several brands of ozone generators have EPA establishment number on their packaging. In keeping with EPA's policy of insuring that the information it provides is based on sound science, only peer reviewed, scientifically supported findings and conclusions were relied upon in developing this document. In developing Ozone Generators that are Sold as Air Cleaners, the EPA reviewed a wide assortment of this literature, including information provided by a leading manufacturer of ozone generating devices. However, much of this material makes claims or draws conclusions without substantiation and sound science.

There is a large body of written material on ozone and the use of ozone indoors.
