Safe concentration:
The ozone concentration of people allowed to expose should be less than 0.2mg/m3. Industrial Hygienic standard of ozone: International Ozone Association: 0.1ppm, exposure for 10 hrs; America: 0.1ppm, exposure for 8 hrs; Germany, France, Japan: 0.1ppm; China: 0.15ppm.
Ozone leak of Household Ozone disinfection cabinet should be less than 0.2mg/m3 (for distance of 1.5m more), residue concentration after one disinfection period should be less than 0.2mg/m3. Annimal tests shows, dividing point of ozone toxicity is 0.3ppm, while people can smell ozone in the air when concentration reaches 0.02-0.04ppm, according to the test of ozone toxicity to lung, the superior limit of ozone concentration is 1.5-2.0ppm. Ministry of Health stipulate the maximum allowable concentration is 0.2mg/m3.