“…Hence, its maximum exposure should be limited to 0.5 ppm, and it must be used with other disinfection procedures and health and safety protocols ( Alimohammadi and Naderi, 2020 ; Grignani et al, 2021; Mazur-Panasiuk et al, 2021 ; Merks et al, 2021 ; Moreno et al, 2021 ; Yano et al, 2020 ). Ozone dosage of 1 ppm has been reported to disinfect indoor air from SARS-CoV-2 by 90% within an hour, in conditions of 25°C and 60% - 80% relative humidity ( Yano et al, 2020 ; Oyeyemi et al, 2020 ). Fumigation with 0.5 ppm and 160 µg m −3 of O 3 has also been reported to disinfect surfaces and indoor air, respectively, from SARS-CoV-2 ( Cao et al, 2021 ; Percivalle et al, 2021 ).…”