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Residential indoor and outdoor coarse particles and associated endotoxin exposures


Wheeler, AJ and Dobbin, NA and Lyrette, N and Wallace, L and Foto, M and Mallick, R and Kearney, J and Van Ryswyk, K and Gilbert, NL and Harrison, I and Rispler, K and Heroux, M-E, Residential indoor and outdoor coarse particles and associated endotoxin exposures, Atmospheric Environment, 45 pp. 7064-7071. ISSN 1352-2310 (2011) [Refereed Article]

Copyright Statement

Copyright 2011 Published by Elsevier Ltd

DOI: doi:10.1016/j.atmosenv.2011.09.048


There is a growing body of evidence demonstrating that coarse particles (PM10-2.5) have detrimental impacts upon health, especially for respiratory effects. There are limited data available for indoor residential exposures. Some data exist regarding the composition of this PM size fraction with emphasis on crustal elements and biological components. This study includes data from 146 homes sampled in Regina, Saskatchewan (SK) where 5-day integrated concurrent monitoring of indoor and outdoor coarse particles was conducted during the winter and summer of 2007. The coarse particle filters were subsequently analysed for endotoxin content to determine the contribution of this compound. Winter indoor geometric mean concentrations of coarse particles exceeded outdoor concentrations (3.73 ug m-3 vs 2.49 ug m-3; paired t-test p < 0.0001); however the reverse was found in summer (4.34 ug m-3 vs 8.82 ug m-3; paired t-test p < 0.0001). Linear regression indicated that winter predictors of indoor coarse particles were outdoor coarse particles, ventilation and presence of at least two or more occupants. During the summer, increased use of central air conditioning was associated with reduced coarse particles, while smoking and the presence of two or more occupants resulted in increased coarse particles. Endotoxin concentrations (EU ug-1) were lower indoors than outdoors in both seasons. Spatial variability of ambient coarse particles was assessed to determine the suitability of using a single monitoring station within a city to estimate exposure. The coefficients of variation between homes sampled simultaneously and the central monitoring station were calculated (median COV in summer = 15% and winter = 24%) and showed significant variability by week, especially during the summer months, suggesting a single site may be insufficient for characterizing exposure. Future studies should consider daily measurements per home to understand shorter term exposures and day to day variability of these pollutants.

Item Details

Item Type:Refereed Article
Keywords:Coarse particles; Endotoxin; Indoor air quality; Spatial variability
Research Division:Commerce, Management, Tourism and Services
Research Group:Human resources and industrial relations
Research Field:Occupational and workplace health and safety
Objective Division:Health
Objective Group:Public health (excl. specific population health)
Objective Field:Public health (excl. specific population health) not elsewhere classified
UTAS Author:Wheeler, AJ (Dr Amanda Wheeler)
ID Code:101118
Year Published:2011
Web of Science® Times Cited:21
Deposited By:Menzies Institute for Medical Research
Deposited On:2015-06-10
Last Modified:2022-09-02

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