In this 2009 study performed in Japan, extremely low concentration chlorine dioxide gas was released into the school classroom. During a period of 38 consecutive school days the rate of schoolchildren absent from the school was markedly lower (1.5%) in a classroom where the ClO2 device was placed.
![lowersAbsenteeism-ChlorineDioxide_featured_TruthForHealth](https://www.truthforhealth.org/wp-content/uploads/2022/05/lowersAbsenteeism-ChlorineDioxide_featured_TruthForHealth.png)