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EXPOSURE ANALYSIS FROM PERSONAL AND AMBIENT AIR SAMPLING: RESULTS OF THE 1998 BALTIMORE STUDY
Citation:
Williams, R W., J P. Creason, R B. Zweidinger, J C. Suggs, R K. Kwok, AND L S. Sheldon. EXPOSURE ANALYSIS FROM PERSONAL AND AMBIENT AIR SAMPLING: RESULTS OF THE 1998 BALTIMORE STUDY. Presented at Third Colloquium on Particulate Air Pollution and Public Health, Durham, NC, June 6-8, 1999.
Description:
An integrated epidemiological-exposure panel study was conducted during July-August 1998 which focused upon establishing relationships between potential human exposures to particulate matter (PM) and related co-pollutants with detectable health effects. The study design incorporated repeated 24-hour integrated PM2.5 personal exposure measures as well as a variety of both integrated and continuous PM2.5 and PM10, monitoring. A total of 305 PM2.5 personal exposure samples were obtained over the four week study period using a subject pool of twenty-one elderly residents of an eighteen story retirement facility near Baltimore, Maryland. Each sample represented a unique 24-hour breathing-zone measurement of PM2.5 mass concentration. Matched PM2.5 and PM10 micro-environmental measures were obtained on at least an every-other-day schedule in the apartments of those participating in personal monitoring. Likewise, daily residential indoor, residential outdoor, and community platform measures were taken to investigate spatial variation of PM mass concentration. Results indicated that the PM2.5 size fraction was responsible for >86 % of collected indoor PM10 mass. Daily PM2.5 personal exposure concentrations ranged from 2.4 to 47.8 ug/m3 with an overall individual study mean of 12.9 ug/m3. The mean values from 15 days of apartment monitoring was 10.1 ug/m3, with mean residential indoor and outdoor concentrations of 9.5 and 22.1 ug/m3, respectively. Individual correlation (r2) of personal exposures to matched residential indoor PM2.5 measures ranged from 0.31 to 0.96 with a mean of 0.74. The mean correlation of personal exposures to residential outdoor PM25 concentration was 0.78.
This is a proposed abstract and does not necessarily reflect U.S. Environmental Protection Agency policy.