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:

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.

Related ARB Air Cleaner Information

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 the Indoor Air Quality and Exposure Assessment Section at 916-445-0753.