United States Government Publishing Office publisher pbl distributor dst United States Government Accountability Office author aut Government Organization text government publication eng GAOREPORTS Legislative Agency Publications gao legislative 2010-08-12 U.S. Government Printing Office 2005-06-17 monographic deposited born digital 51 p. GA 1.13:GAO-05-421 https://www.govinfo.gov/app/details/GAOREPORTS-GAO-05-421 P0b002ee18037e2ba f:d05421 DGPO 2010-08-12 2011-03-23 GAOREPORTS-GAO-05-421 machine generated eng fdlp REPORT GAOREPORTS-GAO-05-421 GAO-05-421 Air pollution control Environmental monitoring Fuel prices Fuels Gasoline Motor vehicle pollution control Standards and standardization Environmental protection Other Written Product A26939 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. In less severely polluted areas, the Act allows states, with EPA approval, to require the use of other special blends as part of their effort to meet air quality standards. GAO agreed to answer the following: (1) To what extent are special gasoline blends used in the United States and how, if at all, is this use expected to change in the future? (2) What effect has the use of these blends had on reducing vehicle emissions and improving overall air quality? (3) What is the effect of these blends on the gasoline supply? (4) How do these blends affect gasoline prices? https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-05-421/html/GAOREPORTS-GAO-05-421.htm https://www.govinfo.gov/content/pkg/GAOREPORTS-GAO-05-421/pdf/GAOREPORTS-GAO-05-421.pdf GAO-05-421 https://www.govinfo.gov/app/details/GAOREPORTS-GAO-05-421 Other Written Product GAO-05-421; Gasoline Markets: Special Gasoline Blends Reduce Emissions and Improve Air Quality, but Complicate Supply and Contribute to Higher Prices; Air pollution control Environmental monitoring Fuel prices Fuels Gasoline Motor vehicle pollution control Standards and standardization Environmental protection