2024 No Indoor exposure levels of bacteria and fungi in residences, schools, and offices in China: A systematic review https://onlinelibrary.wiley.com/doi/10.1111/ina.12734 Guo, Kangqi Asia Review Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Bacteria Fungi Air quality Bacteria China Fungi Indoor Systematic review Reviewing 55 Chinese studies, indoor bacterial levels ranged 72.5-7500 CFU/m³ and fungi 12-9730 CFU/m³, with classrooms showing highest averages. Microbial concentrations varied by climate, highlighting need for unified health-based exposure assessment. 2020