Table 4-46: Estimated National Emissions of Nitrogen Oxides (Million short tons)

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  1970 1975 1980 1985 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 (R) 2006 (R) 2007 (R) 2008 (R) 2009 (R) 2010 (R) 2011 (R) 2012 2013
TOTAL 26.88 26.38 27.08 25.76 25.53 25.18 25.26 25.36 25.35 24.96 24.79 24.70 24.35 22.84 22.60 21.55 (R) 23.89 (R) 22.63 (R) 21.36 (R) 20.28 19.11 17.94 16.77 15.69 14.80 14.42 13.55 12.80
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 (R) 10.29 (R) 9.63 (R) 8.96 (R) 8.30 7.95 7.60 6.90 6.20 5.70 5.75 5.36 4.98
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 (R) 4.84 (R) 4.65 (R) 4.45 (R) 4.26 3.88 3.51 3.48 3.42 3.35 3.12 2.92 2.72
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 7.04 6.59 6.33 5.90 5.47 5.04 4.64 4.25 3.85 3.57 3.42
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 0.96 0.97 0.98 0.98 0.99 0.99 1.05 1.11 1.17 1.17 1.17
Waste disposal and recycling 0.44 0.16 0.11 0.09 0.09 0.10 0.10 0.12 0.11 0.10 0.15 0.16 0.16 0.16 0.13 0.13 0.11 0.12 0.13 0.15 0.13 0.11 0.10 0.09 0.09 0.08 0.08 0.08
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 0.23 0.25 0.27 0.27 0.26 0.26 0.29 0.31 0.43 0.43 0.43

KEY: R = revised.

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

NOTE

Details may not add up to totals due to rounding in the source.

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 Dec. 6, 2013.