Ozone is a naturally occurring gas created from oxygen atoms. The oxygen we breathe is made up of 2 oxygen atoms. These oxygen molecules are broken into atoms by the corona discharge during lightning storms or by UV light from the Sun. Single oxygen atoms cannot exist alone without regrouping back into di-atomic oxygen molecules. During this recombination stage some atoms will regroup into loosely-bonded tri-atomic oxygen. This new molecule is called Ozone. Due to the loose bond in this oxygen molecule - ozone is a very strong oxidant and an ideal chemical-free purification and disinfecting agent.
Ozone is very unstable and must be generated at the site of its intended use. Portable ozone generators create ozone at the point of use. Ozone has a half-life of from 10 to 20 minutes, depending on atmospheric conditions. It reverts back to O2 in a short time.
Ozone is frequently misdiagnosed and equated to low-altitude pollution. Nothing could be farther from the truth. In fact, Ozone breaks down air pollutants.
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Effects of ozone on human health
Even very low concentrations of ozone can be harmful to the upper respiratory tract and the lungs. The severity of injury depends on both by the concentration of ozone and the duration of exposure. Severe and permanent lung injury or death could result from even a very short-term exposure to relatively low concentrations.
Exposure to ozone during exercise or work increases susceptibility to this effect. Increased bronchial responsiveness has been observed following 7-hour exposures to 0.08, 0.1 or 0.12 ppm (with moderate exercise), or a 1-hour exposure to 0.35 ppm. This response occurs almost immediately following exposure to ozone and persists for at least 18 hours.
Other symptoms observed following acute exposures to 0.25-0.75 ppm include cough, shortness of breath, tightness of the chest, a feeling of an inability to breathe (dyspnea), dry throat, wheezing, headache and nausea.
An acute occupational exposure to approximately 11 ppm for 15 minutes caused severe respiratory irritation and almost caused unconsciousness. A 30-minute exposure to 50 ppm is considered potentially lethal.
Ozone concentrations greater than 2 ppm can be irritating to the eyes within minutes. No definite effects on vision were noted in volunteers exposed for 3 or 6 hours to 0.2-0.5 ppm, although some increase in side vision (peripheral) and a slight reduction in visual sharpness (acuity) was noted during dark adaptation tests.
https://www.ccohs.ca/oshanswers/chemicals/chem_profiles/ozone/health_ozo.html
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https://www.sbcapcd.org/sbc/ozonehealth.htm
https://falconblanco.com/health/ozone/oz.htm
You can make Ozon (O3) detector to test your device.