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

Journal article


Sbihi, Hind, Brook, Jeffrey R., Allen, Ryan W., Curan, Jason H., Dell, Sharon, Mandhane, Piush, Scott, James A., Sears, Malcolm R., Subbarao, Padmaja, Takaro, Timothy K., Turvey, Stuart E., Wheeler, Amanda J. and Brauer, Michael. (2013) A new exposure metric for traffic-related air pollution? An analysis of determinants of hopanes in settled indoor house dust. Environmental Health. 12, pp. 1-11. https://doi.org/10.1186/1476-069X-12-48
AuthorsSbihi, Hind, Brook, Jeffrey R., Allen, Ryan W., Curan, Jason H., Dell, Sharon, Mandhane, Piush, Scott, James A., Sears, Malcolm R., Subbarao, Padmaja, Takaro, Timothy K., Turvey, Stuart E., Wheeler, Amanda J. and Brauer, Michael
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.

Keywordsair pollution; dust; exposure assessment; Hopanes; land use regression; traffic
Year2013
JournalEnvironmental Health
Journal citation12, pp. 1-11
PublisherBioMed Central
ISSN1476-069X
Digital Object Identifier (DOI)https://doi.org/10.1186/1476-069X-12-48
Scopus EID2-s2.0-84880299504
Open accessPublished as ‘gold’ (paid) open access
Research or scholarlyResearch
Page range1-11
Publisher's version
License
File Access Level
Open
Output statusPublished
Publication dates
Online19 Jun 2013
Publication process dates
Accepted12 Jun 2013
Deposited29 Mar 2021
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