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Ozone Safety

Ozone is a strong oxidizer that is generally not harmful to mammals at low concentrations, but lethal to microorganisms such as bacteria. However, ozone, like any other strong oxidizing agent, can be harmful if not handled properly. Our OSHA and ozone page has specific numbers on safe ozone levels.

Potential Health Effects as listed on the Ozone Material Safety Data Sheet (MSDS):


Inhalation: Ozone causes dryness of the mouth, coughing, and irritation of the nose, throat, and chest. It may cause
labored breathing, headaches, and fatigue. However, the characteristic sharp, pungent odor is readily detectable at low concentrations (0.005 to 0.02 PPM).

Corrective Measure: Move to fresh air, loosen tight clothing around the torso.
Call medical attention if necessary.
If breathing is difficult, a trained person/EMT should administer oxygen at 15 LPM via non-re-breather.

Skin: Absorption through intact skin is not expected.

Corrective Measure: Wash skin thoroughly with soap and water.

Eye Contact: Ozone can be an irritant to the eyes causing minor
inflammation.

Corrective Measure: Flush eyes with large amounts of water for at least 15
minutes while forcibly holding eyelids apart to ensure flushing of the entire
eye surface. If irritation, pain, or other symptoms persist seek professional
medical attention.

Ingestion: It is not a route of exposure.

Aggravation of Pre-existing Conditions: Ozone may
increase sensitivity to bronchia constrictors including allergens, especially individuals with asthma.



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Chronic Condition: Long term health effects are not expected
from exposures to ozone. A partial tolerance appears to develop with repeated exposures.

For safety protection, personal awareness of an odor of ozone should not be relied upon. Instrumentation and equipment should be provided to measure ambient ozone levels and perform the following safety functions:

  1. Initiate an alarm signal at an ambient ozone level of 0.1 PPM. Equipment can stay operational, if desired.
  2. Initiate a second alarm signal at ambient ozone levels of 0.3 PPM. This signal would also immediately shut down the ozone generation equipment. The majority of humans can smell ozone long before it is dangerous. The odor detection threshold is 0.005-0.02 PPM



Always have an ozone monitor present when generating ozone.


Ozone Affecting Health - Observed EffectsConcentration (ppm)
Threshold of odor, normal person0.005-0.02
Maximum 8 hr. average exposure limit0.1
Minor eye, nose, and throat irriation, headache, shortness of breath>0.1
Breathing disorders, reduced oxygen consumption, lung irritation, severe fatigue, chest pain, dry cough0.5-1.0
Headache, respiratory irritation, and possible coma. Possibility of sever pneumonia at higher levels of exposure1-10
Immediately dangerous to life and health10
Lethal to small animals within two hours15-20

Last Updated: July 8, 2014

The above information is from http://www.OzoneSolutions.com and is copyrighted by Ozone Solutions Inc.
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