2024 Yes Particulate matter in school buildings: Influence of influx control of outdoor PM particles and building renovation in summer https://www.sciencedirect.com/science/article/pii/S0269749123005845?via%3Dihub Jo, Ho Hyeon Asia Exposure Elementary (K-5) Particulate Matter (PM) Temperature Educational buildings Indoor environment particulate matter Renovation School entrance A school case study found that architectural and facility renovations reduced PM influx by 8% with doors open. When combined improperly, PM increased indoors. Findings show both measures are needed and underscore the need for proper operation guidance. 2023