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Table 4-44: Estimated National Average Vehicle Emissions Rates per Vehicle by Vehicle Type using Reformulated Gasoline and Diesel

Table 4-44: Estimated National Average Vehicle Emissions Rates per Vehicle by Vehicle Type using Reformulated Gasoline and Diesel

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(Grams per mile)

  1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
RFG (assuming
100% RFG)
                           
Light-duty
vehicles
                           
Exhaust
HC
1.45 1.28 1.15 1.04 0.97 0.84 0.76 0.68 0.62 0.55 0.47 0.41 0.38 0.35
Nonexhaust
HC
0.89 0.87 0.86 0.84 0.82 0.64 0.63 0.61 0.59 0.57 0.54 0.51 0.47 0.43
Total
HC
2.34 2.15 2.01 1.88 1.78 1.48 1.39 1.29 1.21 1.12 1.02 0.92 0.85 0.78
Exhaust
CO
22.78 20.84 19.43 18.25 17.21 15.36 14.68 13.88 13.17 12.49 11.44 9.81 9.29 8.84
Exhaust
NOx
1.78 1.64 1.55 1.46 1.35 1.24 1.19 1.12 1.06 1.00 0.90 0.77 0.72 0.66
Light-duty
trucks
                           
Exhaust
HC
2.09 1.85 1.69 1.55 1.44 1.27 1.18 1.07 0.97 0.89 0.71 0.63 0.59 0.50
Nonexhaust
HC
0.93 0.91 0.89 0.87 0.85 0.68 0.67 0.64 0.62 0.59 0.56 0.53 0.50 0.47
Total
HC
3.02 2.75 2.58 2.42 2.29 1.96 1.84 1.71 1.59 1.48 1.28 (R) 1.16 1.09 0.97
Exhaust
CO
31.86 29.46 27.70 26.19 24.63 22.25 21.09 19.71 17.78 16.66 14.47 15.79 12.03 11.22
Exhaust
NOx
1.84 1.73 1.65 1.59 1.55 1.47 1.45 1.41 1.36 1.31 1.20 1.07 1.01 0.93
Heavy-duty
vehicles
                           
Exhaust
HC
2.14 1.91 1.70 1.48 1.32 1.16 1.03 0.92 0.77 0.70 0.62 0.51 0.45 0.40
Nonexhaust
HC
1.72 1.64 1.56 1.50 1.43 1.12 1.07 1.03 1.01 0.97 0.90 0.83 0.78 0.73
Total
HC
3.86 3.55 3.26 2.98 2.75 2.28 2.10 1.96 1.78 1.67 1.51 1.34 1.23 1.13
Exhaust
CO
46.02 41.15 36.62 32.80 29.12 25.87 22.88 20.41 16.87 15.33 13.89 12.01 11.25 10.41
Exhaust
NOx
6.13 5.90 5.74 5.57 5.41 5.18 5.01 4.86 4.75 4.63 4.36 3.79 3.39 3.00
Motorcycles                            
Exhaust
HC
1.69 1.63 1.63 1.62 1.61 1.61 1.61 1.61 1.61 1.61 1.61 1.61 1.61 1.61
Nonexhaust
HC
0.55 0.54 0.53 0.53 0.53 0.43 0.43 0.43 0.44 0.44 0.43 0.43 0.42 0.41
Total
HC
2.24 2.17 2.16 2.16 2.14 2.04 2.04 2.04 2.05 2.05 2.04 2.04 2.03 2.02
Exhaust
CO
12.64 12.56 12.56 12.56 12.56 12.56 12.56 12.56 12.56 12.56 12.56 12.56 12.56 12.56
Exhaust
NOx
1.26 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25
DIESEL                            
Light-duty
vehicles
                           
Exhaust
HC
0.77 0.79 0.81 0.81 0.82 0.80 0.76 0.73 0.73 0.60 0.58 0.48 0.36 0.29
Exhaust
CO
1.69 1.73 1.76 1.78 1.79 1.78 1.75 1.73 1.74 1.59 1.57 1.41 1.21 1.09
Exhaust
NOx
1.89 1.89 1.88 1.86 1.85 1.81 1.72 1.62 1.54 1.43 1.32 1.11 0.85 0.69
Light-duty
trucks
                           
Exhaust
HC
1.67 1.69 1.63 1.51 1.42 1.02 0.88 0.96 0.97 0.98 0.80 0.79 0.63 0.55
Exhaust
CO
2.85 2.89 2.79 2.60 2.44 1.77 1.54 1.66 1.68 1.68 1.37 1.34 1.06 0.93
Exhaust
NOx
2.46 2.42 2.31 2.17 2.07 1.76 1.64 1.67 1.66 1.59 1.37 1.30 1.09 0.94
Heavy-duty
vehicles
                           
Exhaust
HC
1.23 1.10 1.00 0.92 0.85 0.79 0.74 0.69 0.61 0.58 0.54 0.51 0.48 0.45
Exhaust
CO
6.32 5.73 5.23 4.80 4.43 4.10 3.82 3.58 3.37 3.19 3.05 2.90 2.66 2.31
Exhaust
NOx
20.49 20.24 20.04 19.84 19.14 18.05 16.68 15.52 13.92 12.50 11.45 10.55 9.60 8.61
Average Emissions Per Vehicle, RFG and Diesel Fleet                            
Exhaust
HC
1.65 1.46 1.34 1.23 1.15 1.02 0.94 0.86 0.78 0.71 0.60 0.53 0.50 0.44
Nonexhaust
HC
0.86 0.84 0.82 0.80 0.78 0.62 0.60 0.58 0.57 0.54 0.52 0.49 0.46 0.42
Total
HC
2.51 2.30 2.16 2.03 1.93 1.64 1.55 1.44 1.35 1.26 1.12 1.02 0.95 0.87
Exhaust
CO
24.92 22.93 21.56 20.38 19.27 17.44 16.62 15.64 14.43 13.62 12.18 10.66 10.12 9.52
Exhaust
NOx
3.36 3.24 3.18 3.12 3.02 2.85 2.71 2.58 2.40 2.24 2.06 1.86 1.71 1.57

KEY: CO = carbon monoxide; HC = hydrocarbon; NOx
= nitrogen oxide; RFG = reformulated gasoline; R = revised.

NOTES

As
of July 1 of each year. Vehicle types are defined as follows: light-duty
vehicles (passenger cars up to 6,000 lb gross vehicle weight rating GVWR) ;
light-duty trucks (pickups and minivans up to 8,500 lb GVWR); heavy-duty
vehicles (8,501 lb or more GVWR); motorcycle (on-highway only). The data in this table are based on
MOBILE6, and reflect the introduction of RFG starting in 1995. Interested
readers can learn more about the MOBILE6 model at the following USEPA Internet
site http://www.epa.gov/otaq/m6.htm.

Emissions
factors are national averages based on the following assumptions: ambient
temperature 75 ºF, daily temperature range 60 -84 ºF, average traffic speed
27.6 mph (representative of overall traffic in urban areas), standard
operating mode (cold-start, hot-start, stabilized), vehicle-miles traveled
fractions and no inspection/maintenance or antitampering programs.

Emissions
estimates in this table assume 100% RFG.

Average emissions per vehicle rates assume a fleet comprised
exclusively of reformulated gasoline and diesel vehicles. For emissions
estimates of a fleet using gasoline and diesel, see table 4-38.

SOURCE

U.S. Environmental Protection Agency, National Vehicle and Fuel
Emissions Laboratory, personal communication, Nov. 23, 2009.

Updated: Sunday, May 21, 2017