Table 4-41: Estimated National Emissions of Nitrogen Oxides
Table 4-41: Estimated National Emissions of Nitrogen Oxides
(Million short tons)
(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.