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TRENDS IN ATMOSPHERIC SULFUR AND NITROGEN SPECIES IN THE EASTERN UNITED STATES 1989-1995
Citation:
Holland, D M., P P. Principe, AND J E. Sickles II. TRENDS IN ATMOSPHERIC SULFUR AND NITROGEN SPECIES IN THE EASTERN UNITED STATES 1989-1995. ATMOSPHERIC ENVIRONMENT 33:37-49, (1999).
Description:
Emission reductions were mandated in the Clean Air Act Amendments of 1990 with the expectation that they would result in major reductions in the concentrations of atmospherically transported pollutants. This paper investigates the form and magnitude of trends from 1989 to 1995 in atmospheric concentrations of sulfur dioxide, sulfate, and nitrogen at 34 rural sites in the eastern US. Across all sites, there is strong evidence of statisticlly significant declining trends in sulfur dioxide and sulfact concentrations. In general, trends in nitrogen concentrations were not as pronounced as trends in the sulfur compounds. A regional estimate of trend for a cluster of sites in the Ohir River valley showed close correspondence between declining sulfur dioxide concentrations and changes in sulfur dioxide emissions in the region.