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Clean air legislation has produced a significant reduction in nationwide sulfur dioxide (SO2) emissions over the last 25 years with an especially significant drop from 1994 to 1995. During the same 25-year period, emissions of oxides of nitrogen (NOx) have stayed fairly constant. Rural measurements of ambient concentrations and concentrations in precipitation of various sulfur and nitrogen species provide information on trends in concentrations and depositions of these species. Data collected over the period 1989 through 1998 show a significant reduction in SO2 concentrations and total (wet plus dry) sulfur depositions averaged over 34 monitoring sites in the eastern U.S. The trends in concentrations and depositions of sulfur were similar to trends in SO2 emissions over the same period. No trends were found for nitrogen species.
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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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