Table 5-12. Nitrogen Oxides and Particulate Matter Emissions by Freight Transportation Mode: 2002
Trucks are by far the largest contributor to freight emissions nationally, producing two-thirds of NOx and PM-10 from the freight sector. New U.S. Environmental Protection Agency emissions standards for trucks are expected to significantly reduce emissions, however, even with large increases in truck traffic.
| Mode | NOx Emissions Tons |
NOx Emissions Percent |
NOx Emissions As percent of: All mobile sources |
NOx Emissions As percent of: All sources |
PM-10 Emissions Tons |
PM-10 Emissions Percent |
PM-10 Emissions As percent of: All mobile sources |
PM-10 Emissions As percent of: All sources |
|---|---|---|---|---|---|---|---|---|
| Heavy-duty vehicles | 3,782,000 | 66.8 | 33.0 | 17.9 | 120,000 | 64.7 | 23.3 | 0.5 |
| Freight railroads | 857,200 | 15.1 | 7.5 | 4.1 | 21,300 | 11.5 | 4.1 | 0.1 |
| Marine vessels | 1,011,000 | 17.9 | 8.8 | 4.8 | 44,000 | 23.7 | 8.5 | 0.2 |
| Air freight | 8,200 | 0.1 | 0.1 | 0.0 | 300 | 0.2 | 0.1 | 0.0 |
| Total | 5,658,400 | 100.0 | 49.4 | 26.8 | 185,600 | 100.0 | 36.0 | 0.8 |
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.
You will need the Microsoft Excel Viewer to view the Excel files on this page.
