Validating sterilization units for factors such as gas concentration, temperature, and relative humidity are very important factors in sterilization rooms. Contaminants or toxic products in the air can be in contact with sterile material and contaminate or corrode them. In addition, ethylene oxide (C2H4O) and hydrogen peroxide (H2O2) should be monitored continuously because, in high concentrations, they can cause fatal lesions in less than 60 minutes.