2024 No The effect of natural ventilation strategy on indoor air quality in schools https://www.sciencedirect.com/science/article/abs/pii/S0048969717305533?via%3Dihub Stabile, Luca Europe Experimental Elementary (K-5) Ventilation rates Temperature Humidity Particulate Matter (PM) School Exposure Particles Airing strategy Carbon dioxide (CO2) Ultrafine particles Ventilation Airing strategies were tested in naturally ventilated Italian classrooms. Longer window openings reduced CO₂ but increased ultrafine particles from outdoors. Results show manual airing alone is insufficient to control all indoor air pollutants effectively. 2017