Transportation energy data book: edition 23 - Oak Ridge National ...

12–2
Transportation accounts for the majority of carbon monoxide and nitrogen oxide emissions. Highway
vehicles are responsible for the largest share of transportation emissions.
Table 12.1
Total National Emissions of the Criteria Air Pollutants by Sector, 2001
(millions of short tons/percentage)
Sector CO NOx VOC PM-10 PM-2.5 SO2 NH3 Highway vehicles 74.83 8.25 4.87 0.22 0.16 0.26 0.28
62.0% 36.9% 27.1% 0.9% 2.2% 1.7% 5.6%
Aircraft 0.26 0.08 0.02 0.00 0.00 0.01 0.00
0.2% 0.4% 0.1% 0.0% 0.0% 0.1% 0.0%
Railroads 0.10 1.00 0.04 0.03 0.02 0.06 0.00
0.1% 4.5% 0.2% 0.1% 0.3% 0.4% 0.0%
Vessels 0.13 1.01 0.03 0.04 0.04 0.16 0.00
0.1% 4.5% 0.2% 0.2% 0.5% 1.0% 0.0%
Other off-highway 24.19 2.07 2.53 0.24 0.23 0.22 0.04
20.0% 9.2% 14.1% 1.0% 3.1% 1.4% 0.7%
Transportation total 99.50 12.41 7.50 0.53 0.45 0.70 0.32
82.4% 55.5% 41.7% 2.2% 6.1% 4.4% 6.3%
Stationary source fuel combustion 4.59 8.60 1.18 1.50 1.32 13.63 0.07
3.8% 38.5% 6.6% 6.2% 17.9% 86.3% 1.4%
Industrial processes 2.74 0.86 7.45 0.76 0.52 1.41 0.17
2.3% 3.9% 41.5% 3.1% 7.1% 8.9% 3.4%
Waste disposal and recycling total 3.23 0.17 0.54 0.50 0.48 0.04 0.09
2.7% 0.8% 3.0% 2.1% 6.4% 0.2% 1.8%
Miscellaneous 10.69 0.31 1.29 20.80 4.61 0.01 4.35
8.9% 1.4% 7.2% 86.3% 62.5% 0.1% 87.1%
Total of all sources 120.76 22.35 17.96 24.10 7.38 15.79 5.00
100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%
Source:
U. S. Environmental Protection Agency, National Emission Inventory Air Pollutant Emission Trends website
www.epa.gov/ttn/chief/trends (Additional resources: www.epa.gov/oar/oaqps)
Note:
CO = Carbon monoxide. NO x = Nitrogen oxides. PM-10 = Particulate matter less than 10 microns.
PM-2.5 = Particulate matter less than 2.5 microns. SO 2 = Sulfur dioxide. VOC = Volatile organic compounds.
NH 3 = Ammonia.
TRANSPORTATION ENERGY DATA BOOK: EDITION 23—2003