HR: 16:45h
AN: A54A-04    [Abstracts]
TI: Properties and Composition of Size Fractionated Indoor, Outdoor, and Personal Particulate Matter in Retirement Homes of the Los Angeles Basin
AU: * Arhami, M
AF: University of Southern California, Department of Civil and Environmental Engineering, 3620 South Vermont Avenue, Los Angeles, CA 90089, United States
AU: Polidori, A
EM: polidori@usc.edu
AF: University of Southern California, Department of Civil and Environmental Engineering, 3620 South Vermont Avenue, Los Angeles, CA 90089, United States
AU: Delfino, R J
EM: rdelfino@uci.edu
AF: University of California, Irvine, Department of Epidemiology Department of Medicine., 224 Irvine Hall, Irvine, CA 92697-7550, United States
AU: Schauer, J J
EM: jjschauer@wisc.edu
AF: University of Wisconsin Madison, Civil and Environmental Engineering Department, 660 N. Park St., Madison, WI 53706, United States
AU: Sioutas, C
EM: sioutas@usc.edu
AF: University of Southern California, Department of Civil and Environmental Engineering, 3620 South Vermont Avenue, Los Angeles, CA 90089, United States
AB: Size fractionated indoor, outdoor and personal particulate matter (PM) samples were collected at four retirement communities of the Los Angeles basin between June 2005 and February 2007 by using personal cascade impactor samplers (PCISs). Two different 6-weeks sampling campaigns were conducted at each site and 24-hr coarse, accumulation, and quasi-ultrafine (UF) mode particles were sampled 6 times per week. A total of 60 nonsmoking subjects age 65 and older affected by coronary artery disease (CAD) were monitored during the sampling period. Daily PM fractions were collected co-currently at indoor and outdoor stationary sites. Hourly indoor and outdoor PM2.5, OC, EC, particle number (PN), ozone (O3), carbon monoxide (CO) and nitrogen oxides (NO and NO2) concentrations were also measured at these sites. Primarily results showed that personal levels were better correlated to indoor levels than the outdoor levels, as elderly subjects spent most of their time indoors. Indoor/outdoor correlations were higher for accumulation mode particles than for UF and coarse particles, suggesting that this size fraction penetrates indoors with great efficiency. Chemical speciation analysis are being implemented on weekly composites of size-resolved indoor and outdoor samples. The UF composites are being analyzed for organic species, metals and water soluble organic carbon (WSOC). Reactive oxygen species (ROS) analyses of water extracts from UF samples are also being implemented to investigate the relationships between the ROS and the chemical composition of UF particles, and analyze its indoor and outdoor spatial and seasonal variations. Accumulation mode samples are being analyzed for metals and WSOC, while coarse mode particles are only being analyzed for metals. Factor analysis will be applied on the chemical speciated indoor and outdoor data to identify potential sources of PM in the study area, and to assess the extent of human exposure to indoor and outdoor PM.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting