Air recirculation and sick building syndrome: a blinded crossover trial.
- 1 March 1994
- journal article
- clinical trial
- Published by American Public Health Association in American Journal of Public Health
- Vol. 84 (3), 422-428
- https://doi.org/10.2105/ajph.84.3.422
Abstract
OBJECTIVE. This study tested the hypothesis that recirculated air in mechanically ventilated buildings causes symptoms commonly referred to as the sick building syndrome and perceptions of poor indoor air quality. METHODS. A blinded, four-period crossover trial was carried out in two identical buildings, contrasting 70% return air (index phase) with 0% of return air (reference phase). Each period lasted 1 work-week. The study population comprised 75 workers who had reported symptoms related to the work environment or perceptions of poor indoor air quality. Participants reported their ratings of symptoms, their perceptions, and related information in a daily diary. The outcome criteria included aggregative symptom scores for mucosal irritation, skin reaction, allergic reaction, and general symptoms formed of ratings of component symptoms. Perceptions of unpleasant odor, stuffiness, or dustiness were additional outcome criteria. RESULTS. All 75 participants returned their diaries. For no symptoms did the scores differ between the two phases more than could be expected by chance. Mean rating of unpleasant odor was significantly smaller during the index phase, but mean ratings of dustiness and stuffiness did not differ materially between the two phases. CONCLUSIONS. Our results suggest that 70% recirculated air, when accompanied by an adequate intake of outdoor air, can be used without causing adverse effects.Keywords
This publication has 20 references indexed in Scilit:
- Sick building syndromeThe Lancet, 1991
- The effect of air humidification on different symptoms in office workers — An epidemiologic studyEnvironment International, 1991
- Volatile organic compounds, respirable dust, and personal factors related to prevalence and incidence of sick building syndrome in primary schools.Occupational and Environmental Medicine, 1990
- Work-related illness in offices: A proposed model of the “sick building syndrome”Environment International, 1989
- The sick buildings and other buildings with indoor climate problemsEnvironment International, 1989
- The prevalence of symptoms associated with sick buildings and polluted industrial environments as compared to unexposed reference groups without expressed dissatisfactionEnvironment International, 1989
- Sick building syndrome, sensation of dryness and thermal comfort in relation to room temperature in an office building: Need for individual control of temperatureEnvironment International, 1989
- A longitudinal study relating carpeting with sick building syndromeEnvironment International, 1989
- Occupational asthma due to oil mists.Thorax, 1988
- The effects of reduced ventilation on indoor air quality in an office buildingAtmospheric Environment (1967), 1983