2024 No Indoor air quality in schools of a highly polluted south Mediterranean area https://onlinelibrary.wiley.com/doi/10.1111/ina.12802 Ruggieri, Silvia Europe Observational Elementary (K-5) Temperature Carbon Dioxide (CO2) Particulate Matter (PM) Nitrogen Dioxide (NO2) Dust Air pollution Der p 1 Endotoxins Heavy metals Indoor comfort parameters fine particulate matter (PM2.5) IAQ was assessed in 64 schools across 5 Central European countries. Formaldehyde, radon, and PM2.5 posed health risks, and 80% of schools exceeded CO₂ guidelines. Results highlight widespread IAQ concerns during the heating season. 2018