BTS | Table 4-39: Estimated National Average Vehicle Emissions Rates by Vehicle Type Using Reformulated Gasoline

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Table 4-39: Estimated National Average Vehicle Emissions Rates by Vehicle Type Using Reformulated Gasoline

(Grams per mile)

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	1995	1996	1997	1998	1999	2000	^E2001
Light-duty vehicles
Exhaust HC	1.43	1.38	1.34	1.30	1.28	1.16	1.15
Nonexhaust HC	0.69	0.68	0.66	0.64	0.60	0.37	0.33
Total HC	2.12	2.06	2.00	1.94	1.88	1.53	1.48
Exhaust CO	16.46	16.14	15.90	15.62	15.48	15.41	15.36
Exhaust NO_x	1.59	1.54	1.49	1.43	1.39	1.29	1.26
Light-duty trucks
Exhaust HC	2.11	2.02	1.93	1.84	1.78	1.63	1.60
Nonexhaust HC	0.85	0.80	0.78	0.75	0.73	0.47	0.44
Total HC	2.96	2.82	2.71	2.59	2.51	2.10	2.04
Exhaust CO	22.15	21.62	21.20	20.59	20.22	19.95	19.77
Exhaust NO_x	1.96	1.93	1.91	1.85	1.82	1.71	1.67
Heavy-duty vehicles
Exhaust HC	4.40	4.02	3.62	3.22	2.96	2.65	2.46
Nonexhaust HC	2.53	2.38	2.24	2.10	1.99	1.30	1.22
Total HC	6.93	6.40	5.86	5.32	4.95	3.95	3.68
Exhaust CO	72.26	65.30	58.59	51.68	46.18	41.04	36.72
Exhaust NO_x	5.47	5.35	5.24	5.04	4.88	4.67	4.51
Motorcycles
Exhaust HC	1.92	1.89	1.88	1.86	1.86	1.82	1.82
Nonexhaust HC	1.91	1.91	1.91	1.91	1.90	1.43	1.43
Total HC	3.83	3.80	3.79	3.77	3.76	3.25	3.25
Exhaust CO	17.46	17.46	17.46	17.36	17.36	17.36	17.36
Exhaust NO_x	0.84	0.84	0.84	0.83	0.83	0.83	0.83
Average of all RFG and diesel vehicles
Exhaust HC	1.77	1.70	1.64	1.58	1.54	1.41	1.39
Nonexhaust HC	0.75	0.73	0.71	0.68	0.64	0.41	0.38
Total HC	2.52	2.43	2.35	2.25	2.18	1.82	1.77
Exhaust CO	19.38	18.83	18.37	17.81	17.45	17.17	16.96
Exhaust NO_x	2.61	2.54	2.48	2.39	2.32	2.19	2.13

KEY: CO = carbon monoxide; E = estimate; 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 MOBILE5b, and reflect the introduction of RFG starting in 1995. MOBILE5b is undergoing a major revision and is expected to be replaced by MOBILE6 in early 2002. Emissions factors are national averages based on the following assumptions: ambient temperature 75 ºF, daily temperature range 60 -84 ºF, average traffic speed 19.6 mph (representative of overall traffic in urban areas), standard operating mode (cold-start, hot-start, stabilized), vehicle-miles traveled fractions, no inspection/maintenance or antitampering programs, and gasoline volatility 9.0 per square inch RVP (Reid vapor pressure).

Emissions estimates in this table assume 100% RFG.

SOURCE: U.S. Environmental Protection Agency, National Vehicle and Fuel Emissions Laboratory, personal communication, Sept. 7, 2001.