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SPARKNET Bibliographybrowse the full database | search
| Author and Title |
Wilson, W. E.; Suh, H. H. (no date) Fine particles and coarse particles: Concentration relationships relevant to epidemiologic studies. |
| Article in |
U.S. Environmental Protection Agency, Research Triangle Park, NC, USA. |
| Available online at |
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| End use |
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| Energy technology |
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| Issue |
Smoke/Particulates/PM10 or Smaller/Dust |
| Level |
Research |
| Description |
Fine particles and coarse particles are defined in terms of the modal structure of particle size distributions typically observed in the atmosphere. Differences between the various modes are discussed. The fractions of fine and coarse particles collected in specific size ranges, such as total suspended particulate matter (TSP), PM10, PM2.5, and PM10-2.5, are shown. Correlations of 24-h concentrations of PM2.5, PM10, and PM10-2.5 at the same site show that, in Philadelphia and St. Louis, PM2.5 is highly correlated with PM10 but poorly correlated with PM10-2.5. Among sites distributed across these urban areas, the site-to-site correlations of 24-h PM concentrations are high for PM2.5 but not for PM10-2.5. This indicates that a PM measurement at a central monitor can serve as a better indicator of the community-wide concentration of fine particles than of coarse particles. The fraction of ambient outdoor particles found suspended indoors is greater for fine particles than for coarse particles because of the difference in indoor lifetimes. Consideration of these relationships leads to the hypothesis that the statistical associations found between daily PM indicators and health outcomes may be the result of variations in the fine particle component of the atmospheric aerosol, not of variations in the coarse component. As a result, epidemiologic studies using PM10 or TSP may provide more useful information on the acute health effects of fine particles than coarse particles. Fine and coarse particles are separate classes of pollutants and should be measured separately in research and epidemiologic studies. PM10-2.5 and PM10-2.5 are indicators or surrogates, but not measurements, of fine and coarse particles. |
This bibliography item comes from the "Broad-search Annotated Bibliography on Acute Respiratory Infections (ARI) and Indoor Air Pollution (With Emphasis on Children Under Five in Developing Countries)", December 1998, Prepared by Daniel M. Kammen, Gemini Wahhaj, and Maame Yaa Yiadom, under EHP Activity No. 263-CC (with support of USAID). Used with permission.
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