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The burden of cleaning up Superfund and other hazardous waste sites is increasingly shifting to taxpayers, particularly since businesses handling hazardous substances are no longer taxed under Superfund and the backlog of sites needing cleanup is growing.
The Clean Air Act, as amended, requires some areas with especially poor air quality to use a "special gasoline blend" designed to reduce emissions of volatile organic compounds (VOC) and nitrogen oxides (NOx) and requiring the use of an oxygenate such as ethanol.
The Environmental Protection Agency (EPA) and several states reviewed by GAO have established financial assistance programs to encourage the assessment, cleanup, and redevelopment of brownfields. The programs run by EPA and the states differ in certain aspects, however.