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Table 4-39: Estimated National Average Vehicle Emissions Rates by Vehicle
Type Using Reformulated Gasoline (Grams per mile)
Excel | CSV
| Light-duty vehicles |
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| Exhaust HC |
1.45 |
1.28 |
1.15 |
1.04 |
0.97 |
0.84 |
0.76 |
0.68 |
0.62 |
| Nonexhaust HC |
0.89 |
0.87 |
0.86 |
0.84 |
0.82 |
0.65 |
0.63 |
0.61 |
0.59 |
| Total HC |
2.34 |
2.15 |
2.01 |
1.88 |
1.78 |
1.48 |
1.39 |
1.29 |
1.21 |
| Exhaust CO |
22.78 |
20.84 |
19.43 |
18.25 |
17.21 |
15.36 |
14.85 |
14.31 |
13.88 |
| Exhaust NOx |
1.78 |
1.64 |
1.55 |
1.46 |
1.35 |
1.24 |
1.19 |
1.12 |
1.06 |
| Light-duty trucks |
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| Exhaust HC |
2.09 |
1.85 |
1.69 |
1.55 |
1.44 |
1.28 |
1.18 |
1.07 |
0.97 |
| Nonexhaust HC |
0.92 |
0.90 |
0.88 |
0.86 |
0.84 |
0.67 |
0.66 |
0.63 |
0.62 |
| Total HC |
3.01 |
2.74 |
2.58 |
2.41 |
2.28 |
1.95 |
1.84 |
1.71 |
1.59 |
| Exhaust CO |
31.86 |
29.46 |
27.70 |
26.19 |
24.63 |
22.25 |
21.23 |
20.08 |
18.39 |
| Exhaust NOx |
1.84 |
1.73 |
1.65 |
1.59 |
1.55 |
1.47 |
1.45 |
1.41 |
1.36 |
| Heavy-duty vehicles |
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| Exhaust HC |
2.14 |
1.91 |
1.70 |
1.48 |
1.32 |
1.16 |
1.03 |
0.92 |
0.77 |
| Nonexhaust HC |
1.72 |
1.64 |
1.56 |
1.50 |
1.43 |
1.12 |
1.07 |
1.03 |
1.01 |
| Total HC |
3.86 |
3.55 |
3.26 |
2.98 |
2.75 |
2.28 |
2.10 |
1.96 |
1.78 |
| Exhaust CO |
46.02 |
41.15 |
36.62 |
32.80 |
29.12 |
25.87 |
22.88 |
20.41 |
16.87 |
| Exhaust NOx |
6.13 |
5.90 |
5.74 |
5.57 |
5.41 |
5.18 |
5.01 |
4.86 |
4.75 |
| Motorcycles |
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| Exhaust HC |
1.69 |
1.63 |
1.63 |
1.62 |
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 |
| Total HC |
2.24 |
2.17 |
2.16 |
2.16 |
2.14 |
2.04 |
2.04 |
2.04 |
2.05 |
| Exhaust CO |
12.64 |
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 |
| Average of all RFG and diesel vehicles |
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| Exhaust HC |
1.65 |
1.46 |
1.34 |
1.23 |
1.15 |
1.02 |
0.94 |
0.86 |
0.78 |
| Nonexhaust HC |
0.85 |
0.84 |
0.82 |
0.80 |
0.78 |
0.62 |
0.60 |
0.58 |
0.57 |
| Total HC |
2.50 |
2.30 |
2.16 |
2.03 |
1.93 |
1.64 |
1.54 |
1.44 |
1.35 |
| Exhaust CO |
24.92 |
22.93 |
21.56 |
20.38 |
19.27 |
17.44 |
16.76 |
15.99 |
15.01 |
| Exhaust NOx |
3.36 |
3.24 |
3.18 |
3.12 |
3.02 |
2.85 |
2.71 |
2.58 |
2.40 |
KEY: CO = carbon monoxide; HC = hydrocarbon; NOx = nitrogen oxide; 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 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.
SOURCES
U.S. Environmental Protection Agency, National Vehicle and Fuel Emissions Laboratory,
personal communications, July 31, 2002 and Nov. 26, 2003.
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