Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Source Apportionment of PM2.5 at An Urban Improve Site in Seattle, Wa

spacer
spacer
Abstract: The multivariate receptor models Positive Matrix Factorization (PMF) and Unmix were used along with EPA's Chemical Mass Balance model to deduce the sources of PM2.5 at a centrally located urban site in Seattle, Washington. A total of 289 filter samples were obtained with an IMPROVE Sampler from 1996 through 1999 and were analyzed for 31 particulate elements including temperature resolved fractions of the particulate organic and elemental carbon. All three receptor models predicted that the major sources of PM2.5 were vegetative burning (including wood stoves), mobile sources, and secondary particle formation, with lesser contributions from re-suspended soil and sea spray. The PMF and Unmix models were able to resolve a fuel oil combustion source as well as distinguish between diesel emissions and other mobile sources. In addition, the average source contribution estimates via PMF and Unmix agreed well with an existing emissions inventory. Using the temperature resolved organic and elemental carbon fractions provided in the IMPROVE protocol, rather than the total organic and elemental carbon, allowed the Unmix model to separate diesel from other mobile sources. The PMF model was able to do this without the additional carbon species, relying on selected trace elements to distinguish the various combustion sources.

This paper has been reviewed in accordance with the US Environmental Protection Agency's peer and administrative review policies and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. The US EPA partially funded the research described here under a contract with Puget Sound Clean Air Agency. Part of this study was funded by the UW/EPA Northwest Research Center for Particulate Air Pollution and Health (R827355)
spacer
Citation:Maykut, N., J. Lewtas, E. Kim, and T. Larson. Source Apportionment of PM2.5 at An Urban Improve Site in Seattle, Wa. ENVIRONMENTAL SCIENCE & TECHNOLOGY 37(22):5135-5142, (2003).
spacer
spacer
Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
spacer
Division: Human Exposure & Atmospheric Sciences Division
spacer
Branch: Immediate Office
spacer
Product Type: Journal
spacer
Published: 11/15/2003
spacer
Downloads:
spacer
Bullet Item Source Apportionment of PM2.5 at An Urban Improve Site in Seattle, Wa
spacer
spacer
Related Entries:
spacer
Bullet Item Biomarkers of PM Exposure to Combustion Source Emissions & Organic (Toxic) Components
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov