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Exposure Assessment from the NERL Research Triangle Park Particulate Matter Panel Study

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Abstract: The U.S. Environmental Protection Agency performed a particulate matter (PM) exposure assessment based on data from the National Exposure Research Laboratory (NERL) Research Triangle Park (RTP) Particulate Matter (PM) Panel Study. This study was a one-year investigation of PM and related co-pollutants involving two distinct subpopulations living within the RTP area of North Carolina. Primary goals were to characterize the relationships between ambient and residential PM measures to those obtained from personal exposure monitoring and estimate ambient source contributions to personal and indoor mass concentrations. A total of 35 participants were involved in personal PM2.5 exposure monitoring. Participating were 27 nonsmoking hypertensive African-Americans living in a low-moderate SES neighborhood (SE Raleigh, NC) and a multi-racial cohort of eight individuals having implanted cardiac defibrillators (Chapel Hill, NC). The volunteers were monitored for seven consecutive days during four consecutive seasonal periods (summer 2000, fall 2000, winter 2001, spring 2001). Results indicated that daily personal PM2.5 mass concentrations were typically higher than their associated residential or ambient measurements (e.g., hypertensive cohort mean personal = 27.6, indoor = 21.7 , outdoor = 18.9, ambient = 18.9 ug/m3). Individual PM2.5 personal exposure concentrations were observed to range from 4 to 218 ug/m3 during the entire study period. Mean observed correlations between personal PM2.5 exposures and other ambient-based measurements varied significantly by season (r = 0.3 to 0.8). Factors influencing these variations are being investigated. Ambient PM2.5 mass concentrations were determined to be highly representative of those obtained from outside each residence regardless of season or distance (r > 0.8). PM2.5 personal cloud estimates for both cohorts averaged ~ 10 ug/m3 across the study. Mixed effects modeling indicates that ambient sources accounted for approximately 50% of the personal PM2.5 mass concentrations. Ranges of these estimates will be presented along with other summary findings.

This work has been funded wholly by the United States Environmental Protection Agency under contract #68-D-99-012 to the Research Triangle Institute and assistance agreement #CR-828186-01-0 to Shaw University. It has been subjected to Agency review and approved for publication.
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Citation:Williams, R. W., A. W. Rea, J. C. Suggs, K. W. Leovic, A. F. Vette, L. S. Sheldon, C. Rodes, J. Thornburg, A. Ejire, and W. Sanders Jr. Exposure Assessment from the NERL Research Triangle Park Particulate Matter Panel Study. Presented at NCCU Environmental Seminar, Durham, NC, October 1, 2002.
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Exposure Measurements & Analysis Branch
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Product Type: Abstrct/Oral
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Presented: 10/01/2002
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Related Entries:
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Bullet Item Outdoor Vs. Human Exposure: NERL PM Exposure Panel Studies
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Last Updated on Monday, October 22, 2007
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