2023 Yes https://www.sciencedirect.com/science/article/pii/S0269749123005845?via%3Dihub Jo, Ho Hyeon Asia Exposure Study Elementary (K-5) Particulate Matter (PM) Temperature Educational buildings Indoor environment Particulate matters Renovation School entrance Following the renovation, the result was evaluated. During the daytime, the air curtain led to a reduction in the influx rate of PM of approximately 8% when the door was open. During the nighttime, it was confirmed that the fine dust influx rate was reduced through reinforcement of the door. However, regarding using these two measures in combination, it was confirmed that the concentration of PM increased in the corridor when the air curtain was operated while the door was closed. It was confirmed that both ARCH-R and FAC-R are necessary for controlling the influx of fine dust from the outdoor air. Appropriate operating guidelines should be provided for school operators.