Freight Facts and Figures 2009

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

Freight transportation is a major source of NO_x emissions, accounting for 27 percent of all NO_x 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 a percent of: All mobile sources	NOx Emissions As a percent of: All sources	PM-10 Emissions Tons	PM-10 Emissions Percent	PM-10 Emissions As a percent of: All mobile sources	PM-10 Emissions As a 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

Note:

Numbers and percents may not add to totals due to rounding.

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 (Washington, DC: 2005), available at www.fhwa.dot.gov/environment/freightaq/ as of April 1, 2009.

 

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