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Acknowledgments US Department of Transportation - BTS

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Table 4-46: Estimated National Emissions <strong>of</strong> Nitrogen Oxides (Million short tons)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 2011TOTAL 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 21.14 20.39 19.65 18.91 17.83 16.74 15.66 13.75 12.91 12.01Highway 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 7.41 6.95 6.49 6.11 5.72 5.33 4.81 4.28 3.76Off-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 4.63 4.76 4.89 4.56 4.24 3.92 3.40 2.87 2.35Fuel 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 6.14 5.78 5.41 5.05 4.13 4.30 4.39Industrial processes a 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 1.00 1.01 1.02Waste 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 0.12 0.11 0.12 0.12 0.13Miscellaneous 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 0.27 0.26 0.29 0.32 0.35KEY: R = revised.aIndustrial processes consists <strong>of</strong> chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrialprocesses; and solvent utilization, storage, and transport.NOTEDetails may not add up to totals due to rounding in the source.SOURCEU.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, available athttp://www.epa.gov/ttn/chief/trends/index.html as <strong>of</strong> Nov. 15, 2011.

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