Table 31. U.S. Nitrogen Oxide Emissions, 1990-1998
(Million Metric Tons)

Source 1990 1991 1992 1993 1994 1995 1996 P1997 1998
Transportation  
  Highway Vehicles 6.39 6.69 6.75 6.81 6.96 6.64 6.57 6.38 NA
  Aircraft 0.14 0.14 0.14 0.14 0.15 0.15 0.15 0.16 NA
  Railroads 0.84 0.84 0.86 0.86 0.86 0.90 0.84 0.86 NA
  Vessels 0.21 0.22 0.21 0.20 0.20 0.21 0.21 0.21 NA
  Other Off-Highway 2.65 2.67 2.70 2.74 2.78 2.84 2.87 2.90 NA
    Total 10.23 10.56 10.66 10.75 10.95 10.73 10.64 10.52 NA
Stationary Source Fuel Combustion  
  Electric Utilities 6.04 5.91 5.90 6.03 5.96 5.79 5.50 5.60 NA
  Industrial 2.75 2.70 2.79 2.86 2.85 2.85 2.88 2.97 NA
  Commercial-Institutional 0.31 0.30 0.32 0.33 0.34 0.34 0.34 0.35 NA
  Residential 0.75 0.83 0.88 0.83 0.82 0.81 0.80 0.78 NA
    Total 9.85 9.75 9.89 10.05 9.96 9.79 9.52 9.70 NA
      Total Energy-Related Emissions 20.08 20.31 20.55 20.80 20.91 20.53 20.15 20.22 NA


Industrial Processes 		0.73 0.65 0.69 0.67 0.69 0.70 0.71 0.74 NA
Solid Waste Disposal  
  Incineration 0.04 0.05 0.05 0.07 0.06 0.05 0.05 0.05 NA
  Open Burning 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 NA
    Total 0.08 0.08 0.09 0.11 0.10 0.09 0.09 0.09 NA
Miscellaneous  
  Forest Fires * * * * * * * * NA
  Other Burning 0.34 0.26 0.23 0.20 0.35 0.21 0.31 0.31 NA
     Total 0.34 0.26 0.23 0.20 0.35 0.21 0.31 0.31 NA
Total All Sources 21.23 21.31 21.55 21.78 22.05 21.53 21.26 21.36 NA

*Less than 5,000 metric tons of nitrous oxide.
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-2, pp. A-7-A-11, web site www.epa.gov/ttn/chief/trends97/emtmd.html.

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