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A new exposure metric for traffic-related air pollution? An analysis of determinants of hopanes in settled indoor house dust

Citation

Sbihi, H and Brook, JR and Allen, RW and Curran, JH and Dell, S and Mandhane, P and Scott, JA and Sears, MR and Subbarao, P and Takaro, TK and Turvey, SE and Wheeler, AJ and Brauer, M, A new exposure metric for traffic-related air pollution? An analysis of determinants of hopanes in settled indoor house dust, Environmental Health: A Global Access Science Source, 12 Article 48. ISSN 1476-069X (2013) [Refereed Article]


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Licensed under Creative Commons Attribution 2.0 Generic (CC BY 2.0) http://creativecommons.org/licenses/by/2.0/

DOI: doi:10.1186/1476-069X-12-48

Abstract

BACKGROUND: Exposure to traffic-related air pollution (TRAP) can adversely impact health but epidemiologic studies are limited in their abilities to assess long-term exposures and incorporate variability in indoor pollutant infiltration.

METHODS: In order to examine settled house dust levels of hopanes, engine lubricating oil byproducts found in vehicle exhaust, as a novel TRAP exposure measure, dust samples were collected from 171 homes in five Canadian cities and analyzed by gas chromatography-mass spectrometry. To evaluate source contributions, the relative abundance of the highest concentration hopane monomer in house dust was compared to that in outdoor air. Geographic variables related to TRAP emissions and outdoor NO2 concentrations from city-specific TRAP land use regression (LUR) models were calculated at each georeferenced residence location and assessed as predictors of variability in dust hopanes.

RESULTS: Hopanes relative abundance in house dust and ambient air were significantly correlated (Pearson's r=0.48, p<0.05), suggesting that dust hopanes likely result from traffic emissions. The proportion of variance in dust hopanes concentrations explained by LUR NO2 was less than 10% in Vancouver, Winnipeg and Toronto while the correlations in Edmonton and Windsor explained 20 to 40% of the variance. Modeling with household factors such as air conditioning and shoe removal along with geographic predictors related to TRAP generally increased the proportion of explained variability (10-80%) in measured indoor hopanes dust levels.

CONCLUSIONS: Hopanes can consistently be detected in house dust and may be a useful tracer of TRAP exposure if determinants of their spatiotemporal variability are well-characterized, and when home-specific factors are considered.

Item Details

Item Type:Refereed Article
Keywords:Air pollution, Dust, Exposure assessment, Hopanes, Land use regression, Traffic
Research Division:Medical and Health Sciences
Research Group:Public Health and Health Services
Research Field:Environmental and Occupational Health and Safety
Objective Division:Health
Objective Group:Public Health (excl. Specific Population Health)
Objective Field:Environmental Health
Author:Wheeler, AJ (Dr Amanda Wheeler)
ID Code:101134
Year Published:2013
Web of Science® Times Cited:3
Deposited By:Menzies Institute for Medical Research
Deposited On:2015-06-10
Last Modified:2017-11-03
Downloads:135 View Download Statistics

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