Gaseous chlorine dioxide (ClO₂) is one of the most promising air disinfectants. In this study, an ultra-low concentration of ClO₂ gas (< 1.2 mg/m³) was generated in an office at various levels of humidity and illuminance to investigate the decay law. The disinfection efficiency and metal corrosiveness of ultra-low concentrations of ClO₂ gas were also studied using an experimental chamber. At 48% and 75% humidity, the decay rate constants of ClO₂ gas were 0.0034 min⁻¹ and 0.0036 min⁻¹, respectively. The rate of decline of the ClO₂ concentration increased as the humidity of the environment increased. The decay rate constant of ClO₂ gas at an illuminance of 76 lux and 3429 lux was 0.0034 min⁻¹ and 0.00427 min⁻¹, respectively; hence, the decay rate increased with increased illumination. At a humidity of 72% and illuminance of 2112 lux, the decay rate constant reached 0.00880 min⁻¹. The effects of humidity and illuminance on the attenuation of the ClO₂ concentration were strongly synergistic. When the gas concentration was maintained below 0.9 mg/m³, the disinfection rate of ClO₂ on bacteria (P. aeruginosa, V. mimicus and S. aureus) exceeded 99.9%; thus, ClO₂ gas exhibited a high disinfection efficiency. In addition, there was no corrosion to various metals by ClO₂ under the same conditions. Consequently, gaseous ClO₂ at ultra-low concentrations has a high sterilisation efficiency and is non-corrosive to metals.

气态二氧化氯（ClO ₂）是最有前途的空气消毒剂之一。在这项研究中，在不同湿度和照度的办公室中，产生了超低浓度的ClO ₂气体（<1.2 mg / m ³），以研究衰减规律。还使用实验箱研究了超低浓度ClO ₂气体的消毒效率和金属腐蚀性。在湿度为48％和75％时，ClO ₂气体的衰减速率常数分别为0.0034 min ^-1和0.0036 min ^-1。ClO ₂浓度的下降率随着环境湿度的增加而增加。ClO的衰减率常数_2种气体在76 lux和3429 lux的照度下分别为0.0034 min ^-1和0.00427 min ^-1；因此，衰减率随照明度的增加而增加。在72％的湿度和2112 lux的照度下，衰减率常数达到0.00880 min ^-1。湿度和照度对ClO ₂浓度衰减的影响具有强烈的协同作用。当气体浓度保持在0.9 mg / m ^3以下时，ClO ₂对细菌（铜绿假单胞菌，拟南芥假单胞菌和金黄色葡萄球菌）的消毒率超过99.9％；因此，ClO ₂气体具有较高的消毒效率。另外，在相同条件下，ClO ₂不会腐蚀各种金属。因此，超低浓度的气态ClO ₂具有高的杀菌效率并且对金属没有腐蚀性。