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Open AccessArticle
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
by
Yong Yu
Yong Yu 1,
Marco Gola
Marco Gola 1,*
,
Gaetano Settimo
Gaetano Settimo 2
and
Stefano Capolongo
Stefano Capolongo 1
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
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.
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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