Table 30. U.S. Carbon Monoxide Emissions, 1990-1998
 (Million Metric Tons)

Source 1990 1991 1992 1993 1994 1995 1996 P1997 1998
Transportation  
  Highway Vehicles 52.48 56.31 54.30 54.61 56.09 49.08 48.32 45.59 NA
  Aircraft 0.82 0.81 0.82 0.82 0.83 0.85 0.86 0.92 NA
  Railroads 0.11 0.11 0.11 0.11 0.10 0.10 0.10 0.10 NA
  Vessels 0.08 0.08 0.08 0.07 0.07 0.07 0.07 0.08 NA
  Other Off-Highway 12.94 12.95 13.19 13.36 13.55 13.73 13.85 14.10 NA
Total 66.43 70.25 68.50 68.97 70.65 63.85 63.20 60.79 NA
Stationary Source Fuel Combustion  
  Electric Utilities 0.33 0.32 0.32 0.33 0.34 0.34 0.36 0.37 NA
  Industrial 0.80 0.83 0.87 0.95 0.94 0.96 0.97 1.01 NA
  Commercial-Institutional 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 NA
  Residential 3.67 3.97 4.20 3.59 3.51 3.88 3.87 2.76 NA
Total 4.86 5.18 5.45 4.94 4.87 5.25 5.28 4.22 NA


 Total Energy-Related Emissions 		71.29 75.44 73.96 73.91 75.53 69.10 68.48 65.01 NA


Industrial Processes 		4.33 4.19 4.12 4.22 4.19 4.18 4.19 4.36 NA
Solid Waste Disposal  
  Incineration 0.34 0.36 0.37 0.45 0.42 0.39 0.40 0.42 NA
  Open Burning 0.64 0.66 0.66 0.68 0.68 0.68 0.69 0.70 NA
    Total 0.98 1.01 1.03 1.13 1.11 1.07 1.09 1.12 NA
Miscellaneous  
  Forest Fires 5.38 3.11 1.52 1.44 3.73 1.33 3.50 3.50 NA
  Other Burning 4.79 4.83 4.88 4.92 4.99 5.06 5.08 5.18 NA
    Total 10.17 7.94 6.40 6.36 8.72 6.39 8.58 8.68 NA


Total All Sources 		86.77 88.58 85.51 85.62 89.54 80.74 82.34 79.18 NA
Carbon Content of Carbon Monoxide 37.21 37.99 36.67 36.71 38.40 34.62 35.31 33.95 NA
Carbon Content of Energy-Related
Carbon Monoxide 		30.57 32.35 31.71 31.69 32.39 29.63 29.36 27.88 NA

P = preliminary data. NA = not available.
Note: Data in this table are revised from the data contained in the previous EIA report, Emissions of Greenhouse Gases in the United States 1997, DOE/EIA-0573(97) (Washington, DC, October 1998).
Source: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Pollutant Emission Trends Update, 1900-1997, EPA-454-R-98-007 (Research Triangle Park, NC, December 1998), Table A-1, pp. A-2-A-6, web site www.epa.gov/ttn/chief/trends97/emtmd.html.

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