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An eight-station visibility-monitoring network has been operated under the EPA Clean Air Status and Trends Network (CASTNet) since 1994. The network extends from Louisiana to Illinois to New York. Particulate matter less than or equal to 2.5 micrometers (PM2.5) aerosols and their chemical constituents are measured at all eight sites. Nephelometer measurements and photographs of scenic vistas have been taken at several sites. An analysis of visual air quality measurements shows a strong relationship between atmospheric light scattering, visual quality, and PM2.5 mass. PM2.5 mass concentrations peaked in the summer months and were highly correlated with fine (PM2.5) atmospheric sulfate. Organic carbon and particulate nitrate (NO3) are also important constituents. Organic carbon is a large constituent in the warmer months and warmer regions of the country, and NO; is relatively more important in colder months and colder climates. Light scattering increased as concentrations of PM2.5 and particulate sulfate (SO2-4) increased. Photographs of scenic vistas showed excellent visual quality and content during periods of low PM2.5 and SO2-4 concentrations and poor visual quality during periods of high concentrations.
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CNumber:
ACE 2000, Salt Lake City, UTAH
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Publication Type:
Proceedings
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Publication Date:
June 2000
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