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Trends in Rural Sulfur Concentrations

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Abstract:This paper presents an analysis of regional trends in atmospheric concentrations in sulfur dioxide (502) and particulate sulfate (50~- ) at rural monitoring sites in the Clean Air Act Status and Trends Monitoring Network (CAsTNet) from 1990 to 1999. A two-stage approach is used to estimate regional trends and standard errors in the Midwest and Mid-Atlantic regions of the U .5. In the first stage, a linear regression model is used to estimate site-specific trends in data adjusted for the effects of season and meteorology. In the second stage, kriging methodology based on maximum likelihood estimation is used to estimate regional trends and standard errors. The method is extended to include a Bayesian analysis to account for the uncertainty in estimating the spatial covariance parameters. Both spatial prediction techniques produced similar results in terms of regional trends and standard errors.
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Citation:Holland, D. M., P. Caragea, and R. L. Smith. Trends in Rural Sulfur Concentrations. Presented at International Conference on Environmental Statistics and Health, Santiago de Compostela, Spain, July 16-18, 2003EPA/600/A-03/206.
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Contact: Chris Siebert - (702) 798-2234 or siebert.christopher@epa.gov
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Division: Environmental Sciences Division
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Branch: Landscape Characterization Branch (RTP)
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Product Type: Sympos/Conf
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Presented: 07/16/2003
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Related Entries:
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Bullet Item Atmospheric Ecosystem Stressor Pattern and Trend Analysis
spacer Relationship Reason:   A Project of the Product
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Bullet Item Environmental Statistics Initiative
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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