Table 4-40:  Estimated National Emissions of Carbon Monoxide (Million short tons) ,,,,,,,,,,,,,,,,,,,,,
,1970,1975,1980,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999, 2000,2001,2002
TOTAL all sources,204.04,188.40,185.41,176.84,173.67,172.97,174.42,160.52,154.19,147.13,140.90,135.90,133.56,126.78,128.86,117.91,115.38,(R) 114.54,(R) 114.47,(R) 106.30,112.05
"Transportation, total",166.29,157.34,147.70,138.13,136.22,134.30,127.66,121.00,114.34,109.11,103.89,98.67,93.44,88.22,82.99,80.22,77.64,(R) 73.64,72.49,(R) 67.99,66.60
On-road vehicles,163.23,153.56,143.83,134.19,132.26,130.33,123.64,116.95,110.26,104.98,99.71,94.43,89.16,83.88,78.61,75.85,73.24,(R) 68.71,68.06,(R) 63.48,62.16
Off-road,3.06,3.78,3.88,3.94,3.97,3.97,4.02,4.05,4.08,4.13,4.18,4.24,4.28,4.34,4.39,4.37,4.40,(R) 4.93,4.43,4.51,4.44
Aircraft,0.17,0.18,0.21,0.22,0.22,0.22,0.23,0.23,0.24,0.24,0.24,0.24,0.25,0.25,0.25,0.28,0.30,(R) 0.36,0.27,0.26,0.26
Railroads,0.11,0.11,0.12,0.10,0.09,0.09,0.09,0.09,0.09,0.10,0.10,0.10,0.10,0.10,0.10,0.10,0.09,(R) 0.10,0.10,0.10,0.09
Marine vessels,0.13,0.13,0.13,0.14,0.14,0.14,0.14,0.14,0.13,0.13,0.14,0.14,0.14,0.14,0.14,0.13,0.13,0.12,0.13,0.13,0.13
Other off-roada,2.65,3.36,3.42,3.49,3.52,3.52,3.57,3.59,3.62,3.66,3.71,3.76,3.80,3.85,3.89,3.87,3.88,(R) 4.36,3.93,4.02,3.97
"Nontransportation, total",37.75,31.06,37.71,38.72,37.45,38.67,46.76,39.52,39.85,38.02,37.01,37.23,40.12,38.56,45.87,37.69,37.74,(R) 40.90,(R) 41.97,(R) 38.31,45.45
Fuel combustion,4.63,4.48,7.30,8.49,7.55,6.96,7.37,7.44,5.51,5.86,6.16,5.59,5.52,5.93,4.34,4.33,4.33,(R) 5.54,(R) 4.78,(R) 4.83,4.43
Industrial processesb,9.84,7.54,6.95,5.28,5.15,5.00,5.23,5.27,4.77,4.62,4.55,4.65,4.61,4.61,3.64,3.80,3.81,(R) 2.55,(R) 2.63,(R) 2.79,2.66
Waste disposal and recycling,7.06,3.23,2.30,1.94,1.92,1.85,1.81,1.75,1.08,1.12,1.14,1.25,1.23,1.19,2.90,2.95,3.12,(R) 3.02,(R) 1.85,(R) 1.85,1.85
Miscellaneousc,16.22,15.81,21.15,23.02,22.83,24.86,32.35,25.07,28.48,26.42,25.17,25.75,28.76,26.84,34.99,26.61,(R) 26.47,(R) 29.79,(R) 32.71,(R) 28.84,36.51
KEY:  R = revised.,,,,,,,,,,,,,,,,,,,,,
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"a  Other off-road comprises nonroad gasoline- and diesel-powered recreational, airport service and railway maintenance vehicles, and recreational marine vessels.",,,,,,,,,,,,,,,,,,
"b  Industrial processes comprises chemical and allied product manufacturing, metals processing, petroleum and related industries, and other industrial processes; and solvent utilization, storage, and transport.",,,,,,,,,,,,,,,,,,
"c  Miscellaneous comprises nonroad gasoline- and diesel-powered construction, industrial, lawn and garden, farm, light-commercial, logging vehicles and other nonroad sources; agriculture and forestry, health services, cooling towers, fugitive dust; and other combustion sources that could not be accurately allocated to specific source categories. ",,,,,,,,,,,,,,,,,,
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NOTES,,,,,,,,,,,,,,,,,,
"The methodologies used to estimate emissions constantly evolve and undergo major changes.  These improved methods are often used to revise estimates for previous years and, therefore, some estimates in this table may not match estimates produced in previous reports. ",,,,,,,,,,,,,,,,,,
Numbers may not add to totals due to rounding.,,,,,,,,,,,,,,,,,,
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SOURCE,,,,,,,,,,,,,,,,,,
"1970-2002: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries,  Internet website http://www.epa.gov/ttn/chief/trends/ as of Dec. 21, 2004.  ",,,,,,,,,,,,,,,,,,
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