Office of Operations Freight Management and Operations

Freight Facts and Figures 2008

Table 5-12. Freight Nitrogen Oxides (NOx) and Particulate Matter (PM-10) Emissions by Freight Transportation Mode: 2002

Freight transportation is a major source of NOx emissions accounting for 27 percent of all NOx emissions in the United States and one-half of emissions from mobile sources.  Freight transportation also accounts for about one-third of emissions of particulate matter 10 microns in diameter (PM-10) from mobile sources.  Most PM-10, however, comes from agricultural fields, wildfires, and fugitive dust.  Consequently, freight transportation is a minor factor when considering total PM-10 emissions.

Table in Excel format

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, Assessing the Effects of Freight Movement on Air Quality at the National and Regional Level, Final Report, April 2005, available at www.fhwa.dot.gov/environment/freightaq/ as of April 24, 2008.

 

 


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