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• W2017400694 abstract "Children’s exposures to ambient and non-ambient fine particulate matter (PM2.5) were determined using the sulphate and elemental carbon components of the PM2.5 mixture as tracers of the ambient contribution during a 6-week winter period in Prince George, British Columbia, Canada. Personal exposures to PM2.5 were measured in children at 5 elementary schools located throughout the city and ambient samples were collected on school rooftops. Average ambient levels and personal exposures during this time period were 13.8 μg m−3 and 16.4 μg m−3 respectively. From the data pooled across individuals, use of the two different tracers indicated identical estimates of median exposure to ambient PM2.5 (7.5 μg m−3) and similar estimates of non-ambient generated exposure (6.4 and 5.0 μg m−3) and infiltration (0.49 and 0.52) for the sulphate and elemental carbon approach, respectively. The median fraction of the ambient concentration resulting in exposure or exposure factors were 0.54 and 0.55 respectively, however lower values of 0.46 and 0.42 were determined from regression analysis. A strong association was found between exposure to ambient PM2.5 and measured ambient concentrations at both the closest school monitor (median r = 0.92) and a central site (median r = 0.88) demonstrating that the central site monitor was suitable for assessing longitudinal ambient generated exposure throughout the city. These results support the use of elemental carbon as a tracer of ambient generated exposure and the use of ambient data as estimates of longitudinal changes in children’s exposure in this setting. The importance of both ambient and non-ambient sources of PM2.5 is emphasized by their almost equal contribution to total personal exposures. Comparison with other studies suggests a limited influence of climate and the cold season in Prince George on exposure levels and found similar mean non-ambient generated exposures despite large variability across and within subjects in any given location." @default.
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• W2017400694 date "2010-11-01" @default.
• W2017400694 modified "2023-09-26" @default.
• W2017400694 title "Estimation and characterization of children’s ambient generated exposure to PM2.5 using sulphate and elemental carbon as tracers" @default.
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• W2017400694 doi "https://doi.org/10.1016/j.atmosenv.2010.08.004" @default.
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