Figure FE1. Electric Utilities' Share of Total U.S. Emissions of Eight Air Pollutants, 1993

    SO2 = sulfur dioxide, NOx = nitrogen oxides, CO2 = carbon dioxide, N2O = nitrous oxide, PM10 = particulate matter with diameter less than 10 microns, VOCs = volatile organic compounds, CO = carbon monoxide, CH4 = methane.
   * 1992 data.
   Notes: Approximately 37 percent of all methane emitted into the environment comes from landfills. Nitrous oxide emissions are only from coal-fired plants. PM10 data are for primary particulates only.
   Sources: CO2, N2O, CH4: Energy Information Administration, Emissions of Greenhouse Gases in the United States, 1987-1992 (Washington, DC, November 1994), pp. 9, 12, 25, 33, 45, 48. SO2, NOx, PM10, VOCs, CO: Environmental Protection Agency, National Air Quality and Emissions Trends, 1990- 1993, EPA-454/R-94-027 (Research Triangle Park, NC, October 1994), pp. 2-8, 2-9, and 2-10.