Bureau of Transportation Statistics (BTS)

Table 4-41: Estimated National Emissions of Nitrogen Oxides

(Million short tons)

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  (R) 1970 (R) 1975 (R) 1980 (R) 1985 (R) 1990 (R) 1991 (R) 1992 (R) 1993 (R) 1994 (R) 1995 (R) 1996 (R) 1997 (R) 1998 (R) 1999 (R) 2000 (R) 2001 (R) 2002 (R) 2003 (R) 2004 (R) 2005 (R) 2006 2007
TOTAL 26.88 26.38 27.08 25.76 25.53 25.18 25.26 25.36 25.35 24.96 24.79 24.71 24.35 22.84 22.60 21.55 21.14 20.33 19.52 18.71 17.69 17.03
Highway vehicles 12.62 12.06 11.49 10.93 9.59 9.45 9.31 9.16 9.02 8.88 8.73 8.79 8.62 8.37 8.39 7.77 7.87 7.38 6.90 6.41 5.97 5.56
Off-Highway 2.65 2.97 3.35 3.58 3.78 3.85 3.92 3.98 4.05 4.11 4.18 4.18 4.16 4.08 4.17 4.16 4.51 4.47 4.44 4.40 4.27 4.16
Fuel combustion 10.06 10.49 11.32 10.05 10.89 10.78 10.93 11.11 11.02 10.83 10.51 10.55 10.38 9.20 8.82 8.45 7.49 7.20 6.92 6.63 6.17 6.00
Industrial processesa 0.78 0.54 0.56 0.80 0.80 0.72 0.76 0.74 0.77 0.77 0.80 0.84 0.85 0.78 0.81 0.85 0.95 0.95 0.95 0.95 0.93 0.92
Waste disposal and recycling 0.44 0.16 0.11 0.09 0.10 0.10 0.10 0.12 0.11 0.10 0.16 0.16 0.16 0.16 0.13 0.13 0.11 0.11 0.11 0.11 0.11 0.11
Miscellaneous 0.33 0.17 0.25 0.31 0.37 0.29 0.26 0.24 0.39 0.27 0.41 0.19 0.18 0.25 0.28 0.18 0.21 0.21 0.21 0.21 0.24 0.26

Key: R = revised.

a Industrial processes consists of chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; and solvent utilization, storage, and transport.

SOURCE

U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, available at http://www.epa.gov/ttn/chief/trends/index.html as of December 2008.

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