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Recent Applications of Source Apportionment Methods and Related Needs

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Abstract: Traditional receptor modeling studies have utilized factor analysis (like principal component analysis, PCA) and/or Chemical Mass Balance (CMB) to assess source influences. The limitations with these approaches is that PCA is qualitative and CMB requires the input of source profiles; both the interpretation of factors and which profiles to use in CMB can be fairly subjective. Ambient-based, multivariate receptor models, such as the EPA Unmix receptor model and Positive Matrix Factorization (PMF), have an advantage over profile-based models in that they not only estimate source contributions like CMB but also generate source profiles for source identification.

In this presentation, a comparison of CMB and Unmix source contribution estimates will be presented using continuous measurements of volatile organic compounds (VOC) from an auto-GC. The VOC source estimates were then used to assess relationships to ultrafine particle number concentration data collected by a scanning mobility particle sizer and aerodynamic particle sizer at the same location.

Recent EPA PM Panel Studies have used ambient-based receptor models like Unmix and PMF to evaluate indoor and outdoor influences based on ambient, indoor, and personal exposure measurements. While this area shows promise in identifying potential exposure factors, research needs also exist, particularly with regards to measurement methods development.

The information in this document has been funded wholly or in part by the United States Environmental Protection Agency. It has been subjected to agency review and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
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Citation:Mukerjee, S. Recent Applications of Source Apportionment Methods and Related Needs. Presented at Environment Seminar Series, St. Louis, MO, October 4, 1992.
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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 Modeling Research Branch
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Product Type: Abstrct/Oral
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Presented: 10/04/2002
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Related Entries:
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Bullet Item Measurement and Modeling of Air Pollutants in El Paso, Texas
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