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Freight Facts and Figures 2012

Table 5-12. Estimated National Average Vehicle Emissions Rates of Heavy-Duty and Light-Duty Vehicles: 1999-2011 (Historical)

Table in Excel format

Grams per mile

Blank cell. 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Gasoline
Cars
Exhaust HC 1.01 0.88 0.79 0.71 0.66 0.57 0.49 0.45 0.40 0.36 0.33 0.29 0.26
Nonexhaust HC 0.67 0.61 0.56 0.51 0.46 0.42 0.38 0.34 0.31 0.28 0.25 0.22 0.19
Total HC 1.67 1.49 1.35 1.22 1.12 0.99 0.87 0.79 0.71 0.64 0.57 0.51 0.45
Exhaust CO 17.22 15.21 13.51 12.15 11.11 9.63 8.44 7.64 6.93 6.30 5.63 5.17 4.75
Exhaust NOx 2.11 1.98 1.87 1.73 1.61 1.41 1.24 1.15 1.05 0.95 0.85 0.77 0.69
Light trucks
Exhaust HC 1.38 1.31 1.25 1.20 1.17 1.06 0.98 0.92 0.87 0.84 0.79 0.74 0.69
Nonexhaust HC 0.67 0.63 0.60 0.56 0.52 0.48 0.44 0.41 0.39 0.37 0.35 0.33 0.31
Total HC 2.05 1.94 1.85 1.75 1.69 1.54 1.43 1.33 1.25 1.20 1.14 1.08 1.00
Exhaust CO 25.22 23.44 22.03 20.59 19.52 17.48 16.08 14.85 13.94 13.34 12.48 11.77 11.06
Exhaust NOx 2.95 2.85 2.76 2.60 2.51 2.25 2.04 1.93 1.83 1.75 1.66 1.59 1.50
Heavy trucks
Exhaust HC 2.87 2.75 2.66 2.56 2.46 2.13 1.87 1.71 1.57 1.44 1.38 1.30 1.19
Nonexhaust HC 1.25 1.22 1.18 1.12 1.06 0.99 0.94 0.89 0.85 0.80 0.81 0.76 0.70
Total HC 4.12 3.96 3.84 3.68 3.52 3.12 2.81 2.60 2.42 2.24 2.19 2.06 1.89
Exhaust CO 64.49 62.89 61.96 60.43 58.96 52.44 47.27 43.73 40.81 38.02 37.26 35.27 32.95
Exhaust NOx 6.16 5.84 5.73 5.61 5.52 5.00 4.50 4.28 4.07 3.85 3.67 3.56 3.45
Diesel
Cars
Exhaust HC 0.26 0.26 0.24 0.22 0.19 0.17 0.16 0.13 0.11 0.09 0.08 0.08 0.07
Exhaust CO 1.13 1.14 1.03 0.90 0.78 0.67 0.57 0.52 0.49 0.46 0.45 0.54 0.63
Exhaust NOx 1.35 1.36 1.30 1.23 1.48 1.73 1.96 1.78 1.62 1.49 1.38 1.23 1.09
Light trucks
Exhaust HC 0.66 0.65 0.63 0.60 0.64 0.64 0.66 0.68 0.65 0.64 0.63 0.60 0.55
Exhaust CO 3.55 3.51 3.49 3.34 3.55 3.59 3.74 3.84 3.66 3.61 3.53 3.40 3.15
Exhaust NOx 6.16 6.04 5.89 5.82 5.82 5.82 5.83 5.71 5.39 5.16 4.96 4.62 4.26
Heavy trucks
Exhaust HC 1.05 1.06 1.07 1.09 1.12 1.12 1.10 1.07 1.01 0.96 0.94 0.92 0.86
Exhaust CO 4.55 4.59 4.67 4.79 4.89 4.84 4.64 4.42 4.10 3.85 3.72 3.57 3.28
Exhaust NOx 24.51 23.20 22.27 21.44 19.99 18.39 16.84 15.43 14.18 13.06 12.15 10.97 9.84

Key: CO = carbon monoxide; HC = hydrocarbon; NOx = nitrogen oxides

Notes: This table is based on MOVES, a new model from the U.S. Environmental Protection Agency's (EPA) latest highway vehicle emissions factor model. Similar tables in previous editions of Freight Facts and Figures were based on the MOBILE6 model. Thus, the data in this table should not be compared to those in previous editions.

Source:

U.S. Environmental Protection Agency, National Vehicle and Fuel Emissions Laboratory, personal communication, September 19, 2011.

 

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