2022 Yes https://onlinelibrary.wiley.com/doi/10.1111/ina.13068 Sahin, Cagri Europe Observational Elementary (K-5) Carbon Dioxide (CO2) Particulate Matter (PM) Humidity Noise Dust transport Excess risk Indoor air quality Indoor environmental quality particulate matter primary schools. The median CO2 concentration was measured to be >1000 ppm in all seasons/schools. Temperature and RH fell out of the comfort zone in October-December, during which pollutant concentrations were considerably increased, specifically in November, that heating and dust transport periods coincide. The overall mean indoor PM10 and PM2.5 levels were 58 and 31.8 ?g/m3 , respectively. Risk assessment indicate that both short (incidence of asthma symptoms in asthmatic children) and long-term (prevalence of bronchitis) effects are considerable with 10.9 (2.4-19.6)% and 19.5 (2.2-38.8)%, respectively.