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All About Ozone

By HHI Staff

Ozone is a naturally occurring oxygen compound that exists in the upper atmosphere. High above the planet, ozone is beneficial to our health because it blocks a certain amount of the sun’s ultraviolet light from reaching the earth’s surface. In the lower atmosphere, ozone is not so beneficial. It’s one of the components of smog that can prompt an outdoor pollution alert in a major city, such as Los Angeles. When ozone levels are high outdoors, citizens are urged to stay indoors.        


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Ozone is a highly reactive gas with a pungent odor that can cause coughing, choking, headaches, and severe fatigue. Other symptoms include eye, skin, and mucous-membrane irritation. It can cause a breakdown of red blood cells which can contribute to breathing difficulties. Blurred vision and chromosomal aberrations have also been noted. Art galleries have reported that ozone can lead to deterioration of artwork.      


Ozone can occur in the indoor air as a result of ultraviolet light, sparks from electric motors, electronic air cleaners, or negative-ion generators. It can also be given off by copying machines and laser printers. It’s sometimes added to the air on purpose with ozone-generating machines, something indoor air experts generally agree is not a good idea.



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HHI is committed to accuracy of content and correcting information that is incomplete or inaccurate. With our broad scope of coverage of healthful indoor environments, and desire to rapidly publish info to benefit the community, mistakes are inevitable. HHI has established an error correction policy to welcome corrections or enhancements to our information. Please help us improve the quality of our content by contacting with corrections or suggestions for improvement. Each contact will receive a respectful reply.

The Healthy House Institute (HHI), a for-profit educational LLC, provides the information on as a free service to the public. The intent is to disseminate accurate, verified and science-based information on creating healthy home environments.


While an effort is made to ensure the quality of the content and credibility of sources listed on this site, HHI provides no warranty - expressed or implied - and assumes no legal liability for the accuracy, completeness, or usefulness of any information, product or process disclosed on or in conjunction with the site. The views and opinions of the authors or originators expressed herein do not necessarily state or reflect those of HHI: its principals, executives, Board members, advisors or affiliates.

All About Ozone:  Created on June 15th, 2008.  Last Modified on December 10th, 2009


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Information provided by The Healthy House Institute is designed to support, not to replace the relationship between patient/physician or other qualified healthcare provider.

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