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PERSONAL, RESIDENTIAL AND CENTRAL SITE PM MASS CONCENTRATIONS ASSOCIATED WITH THE DETROIT EXPOSURE AND AEROSOL RESEARCH STUDY ( DEARS )
Citation:
WILLIAMS, R. W., A. F. VETTE, C. W. CROGHAN, C. D. STEVENS, P. A. JONES, J. THORNBURG, AND C. E. RODES. PERSONAL, RESIDENTIAL AND CENTRAL SITE PM MASS CONCENTRATIONS ASSOCIATED WITH THE DETROIT EXPOSURE AND AEROSOL RESEARCH STUDY ( DEARS ). Presented at 7th International Aerosol Conference (AAAR), Minneapolis, MN, September 10 - 15, 2006.
Impact/Purpose:
Six objectives have been defined for this study.
(1) To determine the associations between concentrations measured at central site monitors and outdoor residential, indoor residential and personal exposures for selected air toxics, PM constituents, and PM from specific sources.
(2) To describe the physical and chemical factors that affect the relationship between central site monitors and outdoor residential and indoor residential concentrations, including those that affect ambient source impacts.
(3) To identify the human activity factors that influence personal exposures to selected PM constituents and air toxics.
(4) To improve and evaluate models used to characterize and estimate residential concentrations of and human exposures to selected air toxics, PM constituents, and PM from specific sources.
(5) To investigate and apply source apportionment models to evaluate the relationships for PM from specific sources and to determine the contribution of specific ambient sources to residential concentrations and personal exposures to PM constituents and air toxics.
(6) To determine the associations between ambient concentrations of criteria gases (O3, NO2, and SO2) and personal exposures for these gases as well as personal exposures to air toxics, PM constituents, and PM from specific sources.
Description:
The DEARS is a three year field monitoring study being performed by the US EPA's National Exposure Research Laboratory in the Detroit, Michigan area. Two years of monitoring have been completed and data from the first year of the study is currently being analyzed. This report summarizes the fine particulate matter (PM2.5) mass concentrations observed from personal, residential indoor, residential outdoor and central site monitoring. Mass concentrations from the various monitoring locations as well as the observed residential outdoor composition of the PM2.5 mass are provided. Residential infiltration of PM of ambient origin (Fpex) as well as personal exposure factors (Fpex) observed during the first two seasons are reported.