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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Table 4-39: Estimated National Average Vehicle Emissions Rates by Vehicle Type Using Reformulated Gasoline (Grams per mile)

Wednesday, November 21, 2012

Table 4-39: Estimated National Average Vehicle Emissions Rates by Vehicle Type Using Reformulated Gasoline (Grams per mile)

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  R1995 R1996 R1997 R1998 R1999 R2000 R2001 2002
Light-duty vehicles                
Exhaust HC 1.45 1.28 1.15 1.04 0.97 0.84 0.76 0.68
Nonexhaust HC 0.89 0.87 0.86 0.84 0.82 0.65 0.63 0.61
Total HC 2.34 2.15 2.01 1.88 1.78 1.48 1.39 1.29
Exhaust CO 22.78 20.84 19.43 18.25 17.21 15.36 14.85 14.31
Exhaust NOx 1.78 1.64 1.55 1.46 1.35 1.24 1.19 1.12
Light-duty trucks                
Exhaust HC 2.09 1.85 1.69 1.55 1.44 1.28 1.18 1.07
Nonexhaust HC 0.92 0.90 0.88 0.86 0.84 0.67 0.66 0.63
Total HC 3.01 2.74 2.58 2.41 2.28 1.95 1.84 1.71
Exhaust CO 31.86 29.46 27.70 26.19 24.63 22.25 21.23 20.08
Exhaust NOx 1.84 1.73 1.65 1.59 1.55 1.47 1.45 1.41
Heavy-duty vehicles                
Exhaust HC 2.14 1.91 1.70 1.48 1.32 1.16 1.03 0.92
Nonexhaust HC 1.72 1.64 1.56 1.50 1.43 1.12 1.07 1.03
Total HC 3.86 3.55 3.26 2.98 2.75 2.28 2.10 1.96
Exhaust CO 46.02 41.15 36.62 32.80 29.12 25.87 22.88 20.41
Exhaust NOx 6.13 5.90 5.74 5.57 5.41 5.18 5.01 4.86
Motorcycles                
Exhaust HC 1.69 1.63 1.63 1.62 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
Total HC 2.24 2.17 2.16 2.16 2.14 2.04 2.04 2.04
Exhaust CO 12.64 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
Average of all RFG and diesel vehicles                
Exhaust HC 1.65 1.46 1.34 1.23 1.15 1.02 0.94 0.86
Nonexhaust HC 0.85 0.84 0.82 0.80 0.78 0.62 0.60 0.58
Total HC 2.50 2.30 2.16 2.03 1.93 1.64 1.54 1.44
Exhaust CO 24.92 22.93 21.56 20.38 19.27 17.44 16.76 15.99
Exhaust NOx 3.36 3.24 3.18 3.12 3.02 2.85 2.71 2.58

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

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. Emissions factors are national averages based on the following assumptions: ambient temperature 75 F, daily temperature range 60 -84 F, 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.

SOURCE

U.S. Environmental Protection Agency, National Vehicle and Fuel Emissions Laboratory, personal communication, July 31, 2002.