****!!!!****!!!!**** "ClO2 decreased from 10 mg/m3 to 0.8 mg/m3, and the degradation time was 81 min. Reduced to 0.3 mg/m3, degradation time is 96 min; Reduced to 0 mg/m3, the degradation time was 2 h.10 mg/m3 disinfection dose for 30 min, and the total number of bacteria and the number of fungi were 94.6% and 92.1%, respectively. Conclusion ClO2 disinfected the pit air spray with a concentration of 1 000 mg/L and 10 ml/m3, and the sterilization effect was the best for 30 min."