TRANSPORTATION ENERGY DATA BOOK: EDITION 20 - Center for ...

Table 4.3
Emissions of Carbon Monoxide from Highway Vehicles, 1970-98”
(million short tons)
Percent of
Source category 1970 1975 1980 1985 1990 1992 1993 1994 1995 1996 1997 1998 total, 1998
Gasoline powered
Light vehicles &motorcycles 64.03 59.28 53.56 49.45 37.41 39.37 39.16 37.51 33.70 28.73 27.04 27.04 53.7%
Light trucksb 16.57 15.77 16.14 18.96 13.82 14.57 15.20 17.35 14.83 19.27 18.36 18.73 37.2%
Heavy vehicles 6.71 7.14 7.19 7.72 5.36 4.57 4.48 5.53 4.12 3.77 3.35 3.07 6.1%
Total 87.31 82.19 76.89 76.13 56.58 58.51 58.84 60.38 52.65 51.77 48.75 48.83 96.9%
Diesel powered
Light vehicles c 0.03 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.1%
Light trucksb c c 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.0%
Heavy vehicles 0.72 0.92 1.14 1.24 1.23 1.32 1.33 1.41 1.41 1.45 1.47 1.51
Total 0.72 0.95 1.16 1.26 1.27 1.35 1.37 1.45 1.45 1.49 1.51 1.55 3.1%
Total
Highway vehicle total 88.03 83.13 78.05 77.39 57.85 59.86 60.20 61.83 54.11 53.26 50.26 50.39 100.0%
Percent diesel 0.8% 1.1% 1.5% 1.6% 2.2% 2.3% 2.3% 2.3% 2.7% 2.8% 3.0% 3.1%
Source:
U. S. Environmental Protection Agency, National Air Pollutant Emission Trends, 1900-1998,2000, p. A-3 and annual.
(Additional resources: www.epa.gov/oar/oaqps)
“The sums of subcategories may not equal total due to rounding.
bLess than 8,500 pounds.
‘Data are not available.
P
b