Are high ozone density levels harmful to humans?

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Are high ozone density levels harmful to humans?

It is internationally advised that the concentration of ozone should be less than 0.05 ppm (50ppb) at workplace. The United States FDA regulates ozone spillover density to be below 0.05 PPM, which is not harmful to humans. Cashido’s 10 Second Machine is tested by SGS to show the ozone spillover density is below 0.01ppm after 10 minutes of use. The machine includes a 10 minutes auto-cut-off protection. No ozone deaths were reported since ozone was first used in water processing in 1905.