2024 Yes Indoor bacterial load and its correlation to physical indoor air quality parameters in public primary schools https://doi.org/10.1186/s40248-018-0167-y Andualem, Zewudu Africa Observational Exposure Students Elementary (K-5) Particulate Matter (PM) Temperature Humidity Bacteria Other Bacterial load Classrooms Correlation Indoor air Settle plate method Cross-sectional study in 51 classrooms at 8 Ethiopian primary schools used settle plate sampling to assess bacterial load and correlate it with PM2.5, PM10, temperature, and humidity. Findings call for better IAQ control to protect student health. 2019