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A study of indoor carbon dioxide levels and sick leave among office workers
Environmental Health: A Global Access Science Source (2002)
  • Theodore A Myatt, Harvard University
  • John W Staudenmayer, University of Massachusetts - Amherst
  • Kate Adams, Harvard University
  • Michael Walters
  • Stephen N Rudnick, Harvard University
  • Donald K Milton, Harvard University

Background A previous observational study detected a strong positive relationship between sick leave absences and carbon dioxide (CO2) concentrations in office buildings in the Boston area. The authors speculated that the observed association was due to a causal effect associated with low dilution ventilation, perhaps increased airborne transmission of respiratory infections. This study was undertaken to explore this association. Methods We conducted an intervention study of indoor CO2 levels and sick leave among hourly office workers employed by a large corporation. Outdoor air supply rates were adjusted periodically to increase the range of CO2 concentrations. We recorded indoor CO2 concentrations every 10 minutes and calculated a CO2 concentration differential as a measure of outdoor air supply per person by subtracting the 1–3 a.m. average CO2 concentration from the same-day 9 a.m. – 5 a.m. average concentration. The metric of CO2 differential was used as a surrogate for the concentration of exhaled breath and for potential exposure to human source airborne respiratory pathogens. Results The weekly mean, workday, CO2 concentration differential ranged from 37 to 250 ppm with a peak CO2 concentration above background of 312 ppm as compared with the American Society of Heating, Refrigeration and Air-conditioning Engineers (ASHRAE) recommended maximum differential of 700 ppm. We determined the frequency of sick leave among 294 hourly workers scheduled to work approximately 49,804.2 days in the study areas using company records. We found no association between sick leave and CO2 differential Conclusions The CO2 differential was in the range of very low values, as compared with the ASHRAE recommended maximum differential of 700 ppm. Although no effect was found, this study was unable to test whether higher CO2 differentials may be associated with increased sick leave.

Publication Date
October 22, 2002
Publisher Statement
This article was harvested from BioMed Central. © 2002 Myatt et al; licensee BioMed Central Ltd. This article is published in Open Access: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL. This article is available from: doi:10.1186/1476-069X-1-3
Citation Information
Theodore A Myatt, John W Staudenmayer, Kate Adams, Michael Walters, et al.. "A study of indoor carbon dioxide levels and sick leave among office workers" Environmental Health: A Global Access Science Source Vol. 1 Iss. 3 (2002)
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