The international requirements for exposure limits of ozone
There are clear international standards for the exposure limits of ozone. The International Ozone Association, the United States, Germany, France, Japan all stipulate a limit of 0.1 ppm (for 8-10 hours of exposure), while China sets it at 0.15 ppm. In terms of environmental air quality, the newly revised "Air Quality Directive" by the European Union has tightened the detection limit to 0.05 ppm.
In the control of ozone-depleting substances (ODS) in China, the "National Plan for China's Implementation of the Montreal Protocol on Substances that Deplete the Ozone Layer (2025-2030)" clearly states that the production and usage of HCFCs for controlled purposes will be reduced by 67.5% and 73.2% respectively by 2025, and by 97.5% in both 2030; the production and usage of HFCs for controlled purposes will be reduced by 10% of the baseline value in 2029. In addition, the leakage of ozone from household ozone disinfection cabinets in China should not exceed 0.2mg/m³ (more than 1.5 meters away), and the residual concentration after disinfection should not exceed 0.2mg/m³.
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