Factors Affecting the Association between Ambient Concentrations and Personal Exposures to Particles and Gases

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Factors Affecting the Association between Ambient Concentrations and Personal Exposures to Particles and Gases

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dc.contributor.author Sarnat, Stefanie Ebelt
dc.contributor.author Coull, Brent Andrew
dc.contributor.author Schwartz, Joel David
dc.contributor.author Gold, Diane R.
dc.contributor.author Suh MacIntosh, Helen H.
dc.date.accessioned 2011-04-22T19:16:16Z
dc.date.issued 2005
dc.identifier.citation Sarnat, Stefanie Ebelt, Brent A. Coull, Joel Schwartz, Diane R. Gold, and Helen H. Suh. 2006. Factors Affecting the Association between Ambient Concentrations and Personal Exposures to Particles and Gases. Environmental Health Perspectives 114(5): 649-654. en_US
dc.identifier.issn 0091-6765 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:4874473
dc.description.abstract Results from air pollution exposure assessment studies suggest that ambient fine particles [particulate matter with aerodynamic diameter ≤ 2.5 μg (PM2.5)], but not ambient gases, are strong proxies of corresponding personal exposures. For particles, the strength of the personal–ambient association can differ by particle component and level of home ventilation. For gases, however, such as ozone (O3), nitrogen dioxide (NO2), and sulfur dioxide (SO2), the impact of home ventilation on personal–ambient associations is untested. We measured 24-hr personal exposures and corresponding ambient concentrations to PM2.5, sulfate (SO42−), elemental carbon, O3, NO2, and SO2 for 10 nonsmoking older adults in Steubenville, Ohio. We found strong associations between ambient particle concentrations and corresponding personal exposures. In contrast, although significant, most associations between ambient gases and their corresponding exposures had low slopes and R2 values; the personal–ambient NO2 association in the fall season was moderate. For both particles and gases, personal–ambient associations were highest for individuals spending most of their time in high- compared with low-ventilated environments. Cross-pollutant models indicated that ambient particle concentrations were much better surrogates for exposure to particles than to gases. With the exception of ambient NO2 in the fall, which showed moderate associations with personal exposures, ambient gases were poor proxies for both gas and particle exposures. In combination, our results suggest that a) ventilation may be an important modifier of the magnitude of effect in time-series health studies, and b) results from time-series health studies based on 24-hr ambient concentrations are more readily interpretable for particles than for gases. en_US
dc.language.iso en_US en_US
dc.publisher National Institute of Environmental Health Sciences en_US
dc.relation.isversionof doi:10.1289/ehp.8422 en_US
dc.relation.hasversion http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1459914/pdf/ en_US
dash.license LAA
dc.subject air pollution en_US
dc.subject ambient concentration en_US
dc.subject confounding en_US
dc.subject epidemiology en_US
dc.subject nitrogen dioxide en_US
dc.subject ozone en_US
dc.subject particle components en_US
dc.subject personal exposure en_US
dc.subject PM2.5 en_US
dc.subject sulfur dioxide en_US
dc.title Factors Affecting the Association between Ambient Concentrations and Personal Exposures to Particles and Gases en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Environmental Health Perspectives en_US
dash.depositing.author Schwartz, Joel David
dc.date.available 2011-04-22T19:16:16Z
dash.affiliation.other HMS^Medicine-Brigham and Women's Hospital en_US
dash.affiliation.other SPH^Exposure Epidemiology and Risk Program en_US
dash.affiliation.other HMS^Medicine-Brigham and Women's Hospital en_US
dash.affiliation.other SPH^Exposure Epidemiology and Risk Program en_US

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