Air Pollution: Sulfur Dioxide Emissions from Nonferrous Smelters Have Been Reduced

摘要

EPA and the states have generally been effective in getting smelters to take the steps necessary to comply with the Clean Air Act requirements for reducing sulfur dioxide emissions and violations of national ambient air quality standards. The 1984 levels for both sulfur dioxide emissions and violations of standards for sulfur dioxide have been reduced by at least 75 percent of the levels experienced in the early or mid-1970's, although over 50 percent of the emission reductions was attributable to decreased smelter production.