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Sick building syndrome in relation to air exchange rate, CO2, room temperature and relative air humidity in university computer classrooms: an experimental study

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Sick building syndrome in relation to air exchange rate, CO2, room temperature and relative air humidity in university computer classrooms: an experimental study

Content Provider	Springer Nature Link
Author	rbäck, Dan rdström, Klas
Copyright Year	2008
Abstract	To study the effects of ventilation and temperature changes in computer classrooms on symptoms in students.Technical university students participated in a blinded study. Two classrooms had higher air exchange (4.1–5.2 ac/h); two others had lower (2.3–2.6 ac/h) air exchange. After 1 week, ventilation conditions were interchanged between the rooms. The students reported symptoms during the last hour, on a seven-step rating scale. Room temperature, relative air humidity (RH) carbon dioxide (CO2), PM10 and ultra-fine particles (UFP) were measured simultaneously (1 h). Illumination, air velocity, operative temperature, supply air temperature, formaldehyde, NO2 and O3 were measured. Multiple logistic regression was applied in cross-sectional analysis of the first answer (N = 355). Those participating twice (N = 121) were analysed longitudinally.Totally 31% were females, 2.9% smokers and 3.8% had asthma. Mean CO2 was 993 ppm (674–1,450 ppm), temperature 22.7°C (20–25°C) and RH 24% (19–35%). Lower and higher air exchange rates corresponded to a personal outdoor airflow of 7 l/sp and 10–13 L/sP, respectively. Mean PM10 was 20 μg/m3 at lower and 15 μg/m3 at higher ventilation flow. Ocular, nasal and throat symptoms, breathlessness, headache and tiredness were significantly more common at higher CO2 and temperature. After mutual adjustment, ocular (OR = 1.52 per 1°C), nasal (OR = 1.62 per 1°C) and throat symptoms (OR = 1.53 per 1°C), headache (OR = 1.51 per 1°C) and tiredness (OR = 1.54 per 1°C) were significantly associated with temperature; headache was associated only with CO2 (OR = 1.19 per 100 ppm CO2). Longitudinal analysis demonstrated that increased room temperature was related to tiredness (P < 0.05).Computer classrooms may have CO2 above 1,000 ppm and temperatures above 22°C. Increased temperature and CO2 may affect mucosal membrane symptoms, headaches and tiredness. Room temperature was most important. CO2 associations may partly be temperature effects.
Starting Page	21
Ending Page	30
Page Count	10
File Format	PDF
ISSN	03400131
Journal	International Archives of Occupational and Environmental Health
Volume Number	82
Issue Number	1
e-ISSN	14321246
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Indoor air quality Ventilation Room temperature Sick building syndrome (SBS) University students Rehabilitation Environmental Health Occupational Medicine/Industrial Medicine
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health

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Sick building syndrome in relation to air exchange rate, CO2, room temperature and relative air humidity in university computer classrooms: an experimental study