Study on ventilation issues in urban nursery facilities: Long-term field survey in Yokohama, Japan

In many urban nursery facilities in Japan, daily ventilation behavior is restricted, and poor indoor air quality has been an issue of concern. However, the lack specific common standards for environments, including facilities, left unresolved Japan. The purpose this study to clarify issues at areas indicate future measures. To end, was analyzed using data from intermittent measurements taken between 2014 2022 21 Yokohama City. As a result, were classified into three categories based on teachers’ behavior: “window-ventilation type,” “mechanical-ventilation “combined-ventilation type.” There significant difference (p-value <0.001) mean CO 2 concentration window-ventilation type mechanical-ventilation type, combined-ventilation confirming due behavior. It clear that had significantly lower compliance rates with minimum rate required by Japanese Building Standard Law (20 m 3 /h), which buildings must have minimum.