Photograph of  .The Hazards of Ozone O3 & Ozone Gas Generators

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This article explains the hazards associated with use of ozone gas indoors as a "mold remedy" or as an "air purifier" or as a "mold killing agent".

While there are established uses of ozone in industrial applications and in certain sterilization applications, environmental testing experts and authorities such as the US EPA do not recommend use of ozone for mold treatment.

Use of ozone indoors can be hazardous and can cause oxidation or other adverse reactions with other materials and chemicals indoors.

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Ozone Gas Hazards: an Overview of the Hazards of Indoor Ozone Gas

Ozone is widely promoted by ozone generating equipment companies and cleaning services for use in indoor building environments to deodorize, disinfect, "kill" mold, and for "general health".

And while the evidence is that ozone as a mold "treatment" is questionable and while sometimes ozone "mold killing or deodorizing by ozone" causes more problems than it "solves", there are indeed many other appropriate and effective uses of ozone. Indeed dissolved ozone is used in some laundry systems as a disinfectant, typically at levels of 1.5 to 3.0 ppm. [10].

That said, This article describes the dangers of using ozone gas indoors or in vehicles or other enclosed spaces as a deodorant or as a mold treatment.

Other articles in this series give details about ozone gas exposure limits & standards, ozone air purifier warnings, use of ozone as a mold or mold odor treatment, how to test for ozone, ozone toxicity, and authoritative references on the use of ozone in various deodorizing, sterilization and purification applications.

Article Contents

Ozone Exposure Risk Levels for Humans & Other Animals

At What Level Can People Smell Ozone?

At least some people can smell levels of ozone down to 0.05 ppm. This odor-detection level is already half-way to the recommended limit. If you are generating ozone indoors, even at "low" levels a problem may be present. People become desensitized to odors in a short time, perhaps 20 minutes. So if you do not smell it, the ozone level could still be hazardous.

Problems Associated with Ozone Gas Exposure: Complaints & Symptoms

Problems associated with ozone gas exposure include


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