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.",,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,,,