Ozone is harmful to us but only at high concentrations or when breathing for a long time. Although ozone in high concentrations is toxic, ozone treatment is safe as long as it is performed with the necessary precautions.
As with other detergents or chemicals, if not complied with the instructions of use, ozone can be hazardous to your health. It is therefore important that ozone treatment should be performed by properly equipped and trained personnel. More details about safe ozone treatment
Ozone has a very strong odor and can be felt by us at the level of concentration that are not able to harm us. After it is produced in the ozonator and distributed in the room ozone decomposes back into pure oxygen. Ozone, therefore, despite its strength, is not durable – performs its job and disappears.
The maximum, acceptable for people, ozone concentration in the air operating for 8 hours a day and 40 hours per week is 0.2 mg/m3 or 0.1 ppm relative terms. Recommended target level is 0.12 mg/m3 or 0.06 ppm.