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THE RELATIONSHIP BETWEEN BOTH REAL-TIME AND TIME-INTEGRATED COARSE AND FINE PARTICULATE MATTER AT AN URBAN SITE IN LOS ANGELES
Citation:
Geller, M. D., P. M. Fine, C. Sioutas, AND P A. Solomon. THE RELATIONSHIP BETWEEN BOTH REAL-TIME AND TIME-INTEGRATED COARSE AND FINE PARTICULATE MATTER AT AN URBAN SITE IN LOS ANGELES. Presented at Particulate Matter: Atmospheric Sciences, Exposure and the Fourth Colloquium on PM and Human Health, Pittsburgh, PA, March 31-April 4, 2003.
Impact/Purpose:
Develop and evaluate methods for the sampling and analysis of PM in ambient air, with emphasis on FRM/FEM for PMc, measurement of carbonaceous aerosols, measurement of biogenic aerosols, comparisons measurements from the STN and IMPROVE monitoring networks, and continuous methods for PM mass and its chemical components.
Description:
Population exposure to ambient particulate matter (PM) has received considerable attention due to the association between ambient particulate concentrations and mortality. Current toxicological studies and controlled human and animal exposures suggest that all size fractions of PM may be responsible for observed health effects. Recently, technologies for continuously measuring coarse and fine PM mass concentrations have been developed and/or improved. In this study, coarse (PM10-PM2.5) and fine (PM2.5) PM mass concentrations near a typical urban site are measured with both continuous sampling devices and a time-integrated sampling device. The collocated continuous monitors include: a Beta Attenuation Monitor (BAM) to measure PM2.5, an ESP differential Tapered Element Oscillating Microbalance (TEOM) to measure PM2.5, a Scanning Mobility Particle Sizer (SMPS) and Aerodynamic Particle Sizer (APS) to measure both coarse and fine PM, and a Continuous Coarse Monitor (CCM) to measure coarse PM. This device consists of a 2.5 um cutpoint virtual impactor placed upstream of a Tapered Element Oscillating Microbalance (TEOM). Time-integrated samples are taken every sixth day with a Micro-Orifice Uniform Deposit Impactor (MOUDI).
The main objective of this study is to document bot1 short-term and diurnal variation in ambient fine and coarse particulate mass concentrations with respect to each other while considering the effects of sources, weather, wind speed and wind direction. Of particular interest will be how well each size fraction tracks the other, for this will yield insight on the contributions of particular sources to each mode during various conditions.
This is an abstract of a proposed presentation and does not necessarily reflect the United States Environmental Protection Agency (EPA) policy. The actual presentation has not been peer reviewed by EPA. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.