An experimental study on effects of increased ventilation flow on students' perception of indoor environment in computer classrooms

Indoor Air
D Norbäck, Klas Nordström

Abstract

The effects of ventilation in computer classrooms were studied with university students (n = 355) in a blinded study, 31% were women and 3.8% had asthma. Two classrooms had a higher air exchange (4.1-5.2 ac/h); two others had a lower air exchange (2.3-2.6 ac/h). After 1 week, ventilation conditions were shifted. The students reported environmental perceptions during the last hour. Room temperature, RH, CO2, PM10 and ultra-fine particles were measured simultaneously. Mean CO2 was 1185 ppm at lower and 922 ppm at higher air exchange. Mean temperature was 23.2 degrees C at lower and 22.1 degrees C at higher air exchange. After mutual adjustment (temperature, RH, CO2, air exchange), measured temperature was associated with a perception of higher temperature (P < 0.001), lower air movement (P < 0.001), and poorer air quality (P < 0.001). Higher air exchange was associated with a perception of lower temperature (P < 0.001), higher air movement (P = 0.001), and better air quality (P < 0.001). In the longitudinal analysis (n = 83), increased air exchange caused a perception of lower temperature (P = 0.002), higher air movement (P < 0.001), better air quality (P = 0.001), and less odor (P = 0.02). In conclusion, computer classrooms have...Continue Reading

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Citations

Nov 13, 2012·International Archives of Occupational and Environmental Health·Roma Runeson-Broberg, Dan Norbäck
May 31, 2011·Archives de pédiatrie : organe officiel de la Sociéte française de pédiatrie·E CartieauxD Cuny
Apr 5, 2018·International Journal of Environmental Research and Public Health·Katja TähtinenHeidi Salonen
Aug 3, 2018·International Journal of Environmental Health Research·Peter KapaloKinga-Eva Péterfi
Apr 7, 2009·Transactions of the Royal Society of Tropical Medicine and Hygiene·G A MatthewsM Birchmore
Mar 19, 2019·The European Respiratory Journal·Juan WangDan Norbäck
Jul 7, 2020·Arhiv za higijenu rada i toksikologiju·Dario BrdarićKarolina Kramarić

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