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

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    Author
    Sbihi, H; Brook, JR; Allen, RW; Curran, JH; Dell, S; Mandhane, P; Scott, JA; Sears, MR; Subbarao, P; Takaro, TK; ...
    Date
    2013-06-19
    Source Title
    Environmental Health: A Global Access Science Source
    Publisher
    BMC
    University of Melbourne Author/s
    Wheeler, Amanda
    Affiliation
    Melbourne School of Population and Global Health
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Sbihi, H., Brook, J. R., Allen, R. W., Curran, J. H., Dell, S., Mandhane, P., Scott, J. A., Sears, M. R., Subbarao, P., Takaro, T. K., Turvey, S. E., Wheeler, A. J. & Brauer, M. (2013). A new exposure metric for traffic-related air pollution? An analysis of determinants of hopanes in settled indoor house dust. ENVIRONMENTAL HEALTH, 12 (1), https://doi.org/10.1186/1476-069X-12-48.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/256508
    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.

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