Advances in Our Understanding of the Major Sources Contributing to Ambient Particulate Matter in California
This page finalized January 14, 2008
Chair’s Air Pollution Seminar
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Tuesday, January 22, 2008
1:30 - 3:30 p.m.
Sierra Hearing Room, Second Floor
1001 I Street, Sacramento
This
event is being Webcast, click here to view
Webcast viewers: Please send your
questions during broadcast to: sierrarm@calepa.ca.gov
Presentation is available at this link
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Advances in Our
Understanding of the Major Sources Contributing to Ambient Particulate
Matter in California
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Kimberly A. Prather, Ph.D.
Professor of Chemistry
Department of Chemistry & Biochemistry
University of California, San Diego
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Distinguishing between the different sources contributing to atmospheric particulate matter represents a key hurdle
for regulators working to establish the most effective reduction strategies for reducing air pollution levels in
California.
Over the past decade, our group at the University of California, San Diego has been developing a unique source
apportionment approach which relies on using single particle mass spectral "fingerprints" to identify
and apportion particles in ambient studies. Source signature libraries have been created by sampling the emissions
from spark ignition vehicles (gas), heavy duty vehicles (diesel), wood smoke, cooking, various industrial emissions,
dust, ships, and sea salt. These libraries are now being used for on-the-fly apportionment of single particles
in a number of atmospheric studies in California and other regions of the world. Results from two field studies
conducted in San Diego and Riverside California will be discussed in this presentation to demonstrate the potential
for this approach to help unravel the relative contributions of different major sources to atmospheric particulate
matter. The presentation will conclude with highlights of our current research direction which involves using a
mobile platform to study the seasonal and spatial variability of PM sources. |
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Kimberly A. Prather, Ph.D., is a professor of chemistry at the University of California,
San Diego. Dr. Prather's research involves the development of analytical techniques for on-line characterization
of aerosol particles. In the past ten years, Dr. Prather's research group has developed a unique technique, aerosol
time-of-flight mass spectrometry (ATOFMS), which provides continuous information on single particle size and chemical
composition. This instrument has been used extensively for source apportionment studies, as well as understanding
the role of aerosol particles in global climate change, pollution, and health effects. Dr. Prather's most recent
accomplishments include quantitation of the single particle data as well as extending the lower size limit of detection
into the ultrafine size range (<100 nm).
Dr. Prather received her Ph.D. in 1990 from the University of California, Davis. Dr. Prather performed a postdoctoral
fellowship at U.C. Berkeley from 1990-1992. In 1992, she became an assistant professor at U.C. Riverside where
she resided until 2001 when she moved to U.C. San Diego as a Professor of Chemistry. |
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For more information on this
Seminar please contact:
William Vance at (916) 323-1507 or send email to: wvance@arb.ca.gov
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For a complete listing of
the ARB Chairman's Series and the related documentation for each one of the series please check this page
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Note: for a print friendly
version of this page please click on the "Print Friendly" option at the very top of this page.
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Main Seminar Series Page
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Research
Activities
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