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2016 No https://doi.org/10.1111/ina.12222 Canha, Nuno Europe Observational Exposure Study Students Staff Elementary (K-5) Temperature Humidity Carbon Dioxide (CO2) Particulate Matter (PM) Volatile Organic Compounds (VOCs) Other Air stuffiness index Carbon dioxide (CO2) Volatile organic compounds (VOCs) Aldehydes Particulate matter (PM) Study of 51 classrooms in 17 French schools measured ventilation rates, VOCs, PM2.5, CO2, temperature, and humidity over one week; 91% had insufficient ventilation. Results support improving mechanical ventilation and IAQ to protect children’s health.