Pulp Bleaching, ClO2 Technology & Related Challenges ~Nouryon, TAPPI PEERS
**** (2020) " ClO2 is produced on site in concentrations of... 8 to 12 thousand parts per million (ppm)" "Fortunately, ClO2 gas is self-alerting presenting a faint odor of bleach or chlorine at 0.1 ppm levels or less, thus necessitating area evacuation or use of respiratory protection. Based on ERPG data, such low-level exposure to ClO2 gas is not life-threatening. In fact, more recent studies indicate that ClO2 gas at low levels, well below the TWA17 of 0.1 ppm, could be useful as an antimicrobial in the presence of humans to mitigate and/ or prevent viral infection and possibly other related respiratory tract infections... ClO2 gas could be used in places such as hospitals, clinics, offices, hotels, schools and airport buildings without interrupting normal activities."