Trends in sulfur and nitrogen species at collocated NTN-CASTNET sites

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The spatial and temporal trends in wet and dry deposition were evaluated using data from the National Atmospheric Deposition Program National Trends Network (NTN) and the EPA's Clean Air Status and Trends Network (CASTNET). Data from 19 NTN-CASTNET sites collocated within 10 km were considered from 1990 to 2002. Seasonal mean concentrations of sulfur and nitrogen species were evaluated using the Seasonal Kendall Trend test to determine trend direction, statistical significance. On a station-by-station basis, trend magnitudes were highest for SO2, followed by particulate sulfate and aqueous sulfate. For the sulfur species evaluated, trends in SO2 were generally of higher magnitude than trends in particulate sulfate and aqueous sulfate. This is an abstract of a paper presented at the 98th AWMA Annual Conference and Exhibition (Minneapolis, MN 6/21-24/2005).

Original languageEnglish (US)
JournalProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA
StatePublished - 2005
EventAir and Waste Management Association's - 98th annual Conference and Exhibition - Minneapolis, MN, United States
Duration: Jun 21 2005Jun 24 2005

ASJC Scopus subject areas

  • General Environmental Science
  • General Energy


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