Table 5-13. Current and Future Nitrogen Oxides Emissions by Freight Transportation Mode
 |
Tons 2002 |
Tons 2010 |
Tons 2020 |
Percent Change, 2002-2010 |
Percent Change, 2002-2020 |
|---|---|---|---|---|---|
| Heavy-duty trucks | 3,782,000 | 2,186,900 | 662,600 | -42 | -82 |
| Freight rail | 857,200 | 563,200 | 486,400 | -34 | -43 |
| Commercial marine | 1,011,000 | 987,200 | 938,600 | -2 | -7 |
| Air freight | 8,200 | 10,000 | 12,400 | 22 | 51 |
| Freight total | 5,658,400 | 3,747,299 | 2,099,999 | -34 | -63 |
Source: U.S. Department of Transportation, Federal Highway Administration, Impacts of Freight Movement on Air Quality, prepared by ICF Consulting, January 26, 2005, based on U.S. Environmental Protection Agency, National Emissions Inventory.
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