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Ozone-generating air cleaners are marketed to homeowners as well as business establishments ostensibly to remove odors and other contaminants from indoor air. A typical air cleaner consists of an ozone generator, fan, housing, and controls. Units may also employ filters to remove particulate contaminants and radio frequency generators that are designed to ionize particles in the air. Recently, manufacturers have marketed air cleaners with a feedback control system designed to prevent ozone concentrations from reaching levels above about 0.05 ppmv. In formal testing, the Indoor Environment Management Branch (APPCD, NRMRL) will provide answers to the following three fundamental questions: (1) What are the emission rates of ozone from the selected devices at various configurations of air cleaner set-point and fan speed?; (2) For selected devices equipped with a feedback control system, at what concentration does the sensor shut off the ozone generator?; and (3) What ozone concentration gradients are observed in a room where these devices are used? The formal testing (Phase II) will be conducted under an accepted quality assurance plan and test protocol. For more information about ozone generators, visit the website at http://www.epa.gov/appcdwww/crb/iemb/ozone.htm. To access directly from this website, click on downloads on the navigation bar.

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