2024 Yes Effectiveness of a Protocol to Reduce Children's Exposure to Particulate Matter and NO2 in Schools during Alert Days https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9517784/ Zauli-Sajani Europe Modeling Elementary (K-5) Ventilation rates Particulate Matter (PM) Carbon Dioxide (CO2) School Indoor air quality Prevention Particulate matter (PM) severe air pollution episodes This study tested a ventilation protocol with air purifier use on PM10 alert days in a Northern Italy primary school, reducing indoor/outdoor pollutant ratios and children’s exposure without increasing CO2, supporting effective air quality management during pollution episodes and pandemics. 2022