Diurnal and spatial variation in fine and coarse particle concentrations in metropolitan Philadelphia
Conference
·
OSTI ID:197463
- Harvard Univ., Boston, MA (United States). School of Public Health
- Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Lab.
Particle mass (PM{sub 2.5} and PM{sub 10}) concentrations were measured in metropolitan Philadelphia during the summer of 1992, as part of a larger effort to characterize acid aerosol concentrations within urban environments. Sampling was performed simultaneously at seven sites located with metropolitan Philadelphia and at a rural site approximately 18 miles from the city center. In this paper, the authors examine and compare the temporal and spatial variation in fine (d{sub a} < 2.5 {micro}m) and coarse (2.5 < d{sub a} < 10 {micro}m) particle mass concentrations. The analysis of temporal variation examines the daily and hourly variation in fine and coarse mass concentrations and their relationship to measured PM{sub 10} levels. Daily temporal profiles for fine and coarse particle concentrations also were compared for the eight sites, with factors affecting their daily variation discussed. Similarly, factors affecting spatial variation in fine and coarse particle mass concentrations also were identified, with the specific effects of population density, traffic, location, and wind direction addressed. Results from these analyses will help epidemiologists understand how well, or poorly, measurements of fine, coarse, and PM{sub 10} aerosols collected from a single urban monitoring site are able to characterize daily particle concentrations within an urban area.
- OSTI ID:
- 197463
- Report Number(s):
- CONF-9405167--
- Country of Publication:
- United States
- Language:
- English
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