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Article

Can the Building Make a Difference to User’s Health in Indoor Environments? The Influence of PM2.5 Vertical Distribution on the IAQ of a Student House over Two Periods in Milan in 2024

1
Design & Health Lab, Department Architecture, Built Environment and Construction Engineering, Politecnico di Milano, Via G. Ponzio 31‚ 20133 Milan, Italy
2
Department of Environment and Health, Italian National Institute of Health (Istituto Superiore di Sanità), 00161 Rome, Italy
*
Author to whom correspondence should be addressed.
Atmosphere 2025, 16(8), 936; https://doi.org/10.3390/atmos16080936 (registering DOI)
Submission received: 20 June 2025 / Revised: 28 July 2025 / Accepted: 1 August 2025 / Published: 4 August 2025
(This article belongs to the Special Issue Air Quality in Metropolitan Areas and Megacities (Second Edition))

Abstract

This study investigates indoor and outdoor air quality monitoring in a student dormitory located in northern Milan (Italy) using low-cost sensors. This research compares two monitoring periods in June and October 2024 to examine common PM2.5 vertical patterns and differences at the building level, as well as their influence on the indoor spaces at the corresponding positions. In each period, around 30 sensors were installed at various heights and orientations across indoor and outdoor spots for 2 weeks to capture spatial variations around the building. Meanwhile, qualitative surveys on occupation presence, satisfaction, and well-being were distributed in selected rooms. The analysis of PM2.5 data reveals that the building’s lower floors tended to have slightly higher outdoor PM2.5 concentrations, while the upper floors generally had lower PM2.5 indoor/outdoor (I/O) ratios, with the top-floor rooms often below 1. High outdoor humidity reduced PM infiltration, but when outdoor PM fell below 20 µg/m3 in these two periods, indoor sources became dominant, especially on the lower floors. Air pressure I/O differences had minimal impact on PM2.5 I/O ratios, though slightly positive indoor pressure might help prevent indoor PM infiltration. Lower ventilation in Period-2 possibly contributed to more reported symptoms, especially in rooms with higher PM from shared kitchens. While outdoor air quality affects IAQ, occupant behavior—especially window opening and ventilation management—remains crucial in minimizing indoor pollutants. Users can also manage exposure by ventilating at night based on comfort and avoiding periods of high outdoor PM.
Keywords: indoor air quality; particulate matter; student house; residential building; low-cost sensors; monitoring activity indoor air quality; particulate matter; student house; residential building; low-cost sensors; monitoring activity

Share and Cite

MDPI and ACS Style

Yu, Y.; Gola, M.; Settimo, G.; Capolongo, S. Can the Building Make a Difference to User’s Health in Indoor Environments? The Influence of PM2.5 Vertical Distribution on the IAQ of a Student House over Two Periods in Milan in 2024. Atmosphere 2025, 16, 936. https://doi.org/10.3390/atmos16080936

AMA Style

Yu Y, Gola M, Settimo G, Capolongo S. Can the Building Make a Difference to User’s Health in Indoor Environments? The Influence of PM2.5 Vertical Distribution on the IAQ of a Student House over Two Periods in Milan in 2024. Atmosphere. 2025; 16(8):936. https://doi.org/10.3390/atmos16080936

Chicago/Turabian Style

Yu, Yong, Marco Gola, Gaetano Settimo, and Stefano Capolongo. 2025. "Can the Building Make a Difference to User’s Health in Indoor Environments? The Influence of PM2.5 Vertical Distribution on the IAQ of a Student House over Two Periods in Milan in 2024" Atmosphere 16, no. 8: 936. https://doi.org/10.3390/atmos16080936

APA Style

Yu, Y., Gola, M., Settimo, G., & Capolongo, S. (2025). Can the Building Make a Difference to User’s Health in Indoor Environments? The Influence of PM2.5 Vertical Distribution on the IAQ of a Student House over Two Periods in Milan in 2024. Atmosphere, 16(8), 936. https://doi.org/10.3390/atmos16080936

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