University of Oulu

Kuurola, P., Raunima, T., Ketko, J., Toyinbo, O., Vinha, J., & Haverinen-Shaughnessy, U. (2023). Reduced night ventilation did not impair indoor air quality for occupants in a sample of Finnish school and daycare buildings. In Energy and Buildings (Vol. 297, p. 113470). Elsevier BV.

Reduced night ventilation did not impair indoor air quality for occupants in a sample of Finnish school and daycare buildings

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Author: Kuurola, Pentti1; Raunima, Tuomas2; Ketko, Joonas2;
Organizations: 1University of Oulu, Faculty of Technology, P.O.Box 8000, FI-90014 University of Oulu, Finland
2Tampere University, Faculty of Built Environment, FI-33014 Tampere University, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Elsevier, 2023
Publish Date: 2023-10-18


Ventilation in buildings plays a significant role from the points of view of indoor air quality, health and comfort. In addition, ventilation is one major consumer of heating energy in buildings. In this study, we investigated the effects of shutting down mechanical ventilation at nights on measured and occupant reported indoor air quality as well as health symptoms. Extensive field measurements and standard MM questionnaire surveys among school personnel and children were carried out three months before and three months after changing the ventilation operation mode (from 24 h ventilation to shutting down when unoccupied) in twelve school and daycare buildings. There were small differences in the estimated mean indoor temperature, relative humidity, and particle concentrations results before and after the operation mode change (intervention), which could also be related to seasonal factors. However, the intervention did not associate with any of the studied occupant outcomes, including reported thermal comfort, stuffy ‘bad’ air, or health symptoms among children or personnel. Therefore, according to the survey responses, shutting down ventilation at night had no noticeable effects on the perceived indoor air quality and health during occupancy.

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Series: Energy and buildings
ISSN: 0378-7788
ISSN-E: 1872-6178
ISSN-L: 0378-7788
Volume: 297
Article number: 113470
DOI: 10.1016/j.enbuild.2023.113470
Type of Publication: A1 Journal article – refereed
Field of Science: 212 Civil and construction engineering
Funding: This study was conducted as part of the Future Spaces research project, which aims to improve IAQ in service and commercial buildings. The project was funded by Business Finland, the University of Tampere, VTT Technical Research Centre of Finland, as well as the companies involved. The project is part of the activities of Business Finland's indoor air quality growth engine IAQe (Indoor Air Quality ecosystem). The work conducted by the University of Oulu team was partially funded by the Academy of Finland (decision number 342403).
Academy of Finland Grant Number: 342403
Detailed Information: 342403 (Academy of Finland Funding decision)
Dataset Reference: The real data used in this study was obtained through the Future Spaces project. For information on the resources used in this work, please contact the corresponding author.
Copyright information: © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (