Hazardous Ozone-Generating "Air Purifiers"
This page last reviewed March 9, 2015
Not all air-cleaning devices are appropriate for home use — some can be harmful to human health. The ARB recommends that ozone generators, which are air cleaners that intentionally produce ozone, not be used in the home. Ozone is a gas that can cause health problems, including respiratory tract irritation and breathing difficulty (Ozone and Health). This web page provides information on ozone generators as well as useful information for selecting a safe, effective air cleaner.
Air Cleaners to Avoid
Further information on ozone generators is provided at the following links:
- List of Potentially Hazardous Ozone Generators Sold as Air Purifiers
- Fact Sheet: Beware of Ozone-Generating Indoor "Air Purifiers"
California Certified Air Cleaners
The ARB has adopted a regulation to limit the ozone emissions from indoor air cleaning devices. Many manufacturers have submitted test results and obtained ARB certification of their air cleaning devices as required under our regulation. The list of California air cleaners certified to date is available at the link below. Certification is based on their low (usually near-zero) ozone emissions and electrical safety. Check both the list below and the information in the sections entitled "Air Cleaners To Avoid" and "How to Select a Safe and Effective Air Cleaner" to make the best selection for your needs.
How to Select a Safe and Effective Air Cleaner
Links to information that can help you select a safe and effective air cleaner are provided below.
- Air Cleaning Devices for the Home, Frequently Asked Questions
- Consumer Reports - Air purifiers web page
- Clean Air Delivery Rates (CADR) of many air cleaners - Association of Home Appliance Manufacturers (AHAM)
- U.S. Environmental Protection Agency Ozone Generator website
Related ARB Air Cleaner Information
- Report: Evaluation of Ozone Emissions from Portable Indoor Air Cleaners: Electrostatic Precipitators and Ionizers, February 2008
- Final Research Report: "Survey of the Use of Ozone-Generating Air Cleaners by the California Public", December 2006
- Report: Evaluation of Ozone Emissions From Portable Indoor "Air Cleaners" That Intentionally Generate Ozone, May 2006
- Presentation: Actions to Address Indoor Ozone Generators: Health Update to the Board, May 5, 2006
- Press Release: Some Devices Marketed as Air Cleaners Dangerous to Public Health, May 31, 2006
- Presentation: Ozone Generators Sold as Air Purifiers: Health Update to the Board, January 20, 2005
- Press Release: ARB Warns, Danger from Popular "Air Purifying" Machines, January 20, 2005
For additional information on air cleaners and particles, please visit our particles and air cleaners webpage. If you need assistance accessing any of the links above, please contact Stephanie Parent at 916-445-0753.