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Contribution of Fine Particles of Outdoor Origin to Personal Exposures: Results of a 37-Person Panel Study in North Carolina

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Abstract: The US EPA carried out a study of personal exposures to PM2.5 for 37 persons with hypertension or cardiovascular disease in North Carolina. Personal, indoor (home) and outdoor (home and central site) 24-h samples were collected for 7 consecutive days in each of four seasons in 2000-2001. PM results from the study have been previously reported (Williams et al., 2003a,b). We have applied a method based on sulfur measurements to calculate the portion of indoor PM2.5 concentrations and personal exposure due to outdoor particles. Because sulfur has few sources indoors, it can be used as a marker for PM of outdoor origin. All filters (>2000 from the personal, indoor at home and outdoor near home samples) were analyzed by X-ray fluorescence for sulfur among other elements. The fraction of personal exposure due to outdoor particles measured near the homes ranged from 0.33 to 0.77, with a median of 0.53. R2 values for regressions of the outdoor-generated contribution to personal PM2.5 exposure vs. outdoor measurements at the central site ranged from 0.19 to 0.88, with a median value of 0.73.

Although this work was reviewed by EPA and approved for publication, it may not necessarily reflect official Agency policy.
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Citation:Wallace, L. A., and R. W. Williams. Contribution of Fine Particles of Outdoor Origin to Personal Exposures: Results of a 37-Person Panel Study in North Carolina. Presented at International Society of Exposure Analysis 14th Annual Conference, Philadelphia, PA, October 17-21, 2004.
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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: 10/19/2004
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Related Entries:
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Bullet Item Exposure Relationship of Personal Exposure of High-Risk Subpopulations to Ambient Concentrations of Fine Particles.
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