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Know About Ozone Air Purifiers Before You Use Them

Buyers of ozone generators may not be aware that ozone can harm the cells in the lungs and respiratory airways.  Exposure to ozone irritates and inflames the lining of the respiratory system.  It causes symptoms including coughing, chest tightness, and shortness of breath.  In persons with asthma, ozone can worsen asthma symptoms, and one study indicates that ozone may contribute to the development of asthma.  Ozone impairs breathing.  Elevated exposures to ozone can cause permanent lung damage, and repeated exposure can even increase the risk of dying among persons already in poor health.  Persons especially vulnerable include children and those who suffer from asthma or other respiratory diseases, including the elderly.

Not all air-cleaning devices are appropriate for home use some can be harmful to human health.  The ARB recommends that ozone generators, 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.

Due to the health hazards of ozone, California has worked aggressively for decades to reduce outdoor ozone levels, with considerable success.  For more information on the health effects of ozone, visit:

In addition to its impacts on health, ozone can also damage materials such as rubber, fabrics, plastics and other indoor furnishings:

Popular and expensive ionizing air cleaners a staple of late-night infomercials could expose users to lung-damaging levels of ozone, and they do a poor job of actually cleaning the air, according to a study in the May issue of Consumer Reports.


Potentially Hazardous Ozone Generators Sold as Air Purifiers

Updated November 6, 2007

Some devices that are advertised as "air purifiers", air cleaners, or ozone generators purposely emit large amounts of ozone, the main component of smog! Not only are such ozone generators ineffective at cleaning indoor air, but breathing ozone poses serious health risks. The Air Resources Board recommends that these ozone generators not be used.

The following is a partial list of portable air cleaners sold as "air purifiers" or ozone generators that can intentionally emit ozone.  This list includes air cleaners sold primarily for residential use, plus some for commercial, in-vehicle, and personal use. Inclusion on this list is based on information available at the time of review. These devices have not been tested by the Air Resources Board using the test protocol required by the recently approved regulation, and until the testing required by the regulation is completed, we do not know if the ozone emitted will exceed the recently adopted 0.050 ppm standard. Exclusion from this list is not to be construed as endorsement by the California Air Resources Board. In-duct systems and other non-portable ozone generators are not listed here, but may generate potentially harmful levels of ozone.

This list (updated November 6, 2007) will be updated periodically as information becomes available. Popular models are:

Breeze AT

Fresh Air


Fresh Air To Go

EcoQuest (Most models)

Living Air Classic



(click the link below for a more complete list)




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