Table 5-11. Estimated National Average Vehicle Emissions Rates of Heavy-Duty and Light-Duty Vehicles: 1990-2005 (Grams Per Mile)(Historical)

Table in Excel format

	1990	2000	2001	2002	2003	2004	2005	2006
Gasoline (assuming zero RFG)
Cars
Exhaust HC	2.79	0.97	0.89	0.81	0.74	0.61	0.52	0.46
Nonexhaust HC	1.21	0.92	0.88	0.84	0.81	0.77	0.72	0.68
Total HC	3.99	1.89	1.77	1.65	1.54	1.37	1.25	1.13
Exhaust CO	42.89	18.53	18.03	17.58	17.13	13.79	12.57	10.87
Exhaust NOx	2.70	1.29	1.25	1.20	1.14	1.00	0.92	0.79
Light trucks
Exhaust HC	3.68	1.45	1.35	1.24	1.13	0.96	0.78	0.69
Nonexhaust HC	1.36	0.97	0.94	0.89	0.84	0.80	0.76	0.71
Total HC	5.04	2.42	2.29	2.13	1.98	1.76	1.54	1.40
Exhaust CO	56.23	26.81	25.61	24.32	22.30	18.76	16.23	14.33
Exhaust NOx	2.62	1.54	1.53	1.50	1.45	1.32	1.21	1.09
Heavy trucks
Exhaust HC	3.66	1.22	1.09	0.98	0.82	0.73	0.64	0.53
Nonexhaust HC	2.74	1.62	1.54	1.48	1.41	1.35	1.24	1.14
Total HC	6.40	2.84	2.63	2.46	2.24	2.08	1.88	1.67
Exhaust CO	85.61	31.08	27.59	24.73	20.60	18.46	16.73	14.51
Exhaust NOx	7.19	5.26	5.13	5.01	4.91	4.62	4.28	3.73
Diesel
Cars
Exhaust HC	0.68	0.80	0.76	0.73	0.73	0.60	0.58	048
Exhaust CO	1.49	1.78	1.75	1.73	1.74	1.59	1.57	1.41
Exhaust NOx	1.83	1.81	1.72	1.62	1.54	1.43	1.32	1.11
Light trucks
Exhaust HC	1.59	1.02	0.88	0.96	0.97	0.98	0.80	0.79
Exhaust CO	2.67	1.77	1.54	1.66	1.68	1.68	1.37	1.34
Exhaust NOx	2.71	1.76	1.64	1.67	1.66	1.59	1.37	1.30
Heavy trucks
Exhaust HC	2.21	0.79	0.74	0.69	0.61	0.58	0.54	0.51
Exhaust CO	10.06	4.10	3.82	3.58	3.37	3.19	3.05	2.90
Exhaust NOx	23.34	18.05	16.68	15.52	13.92	12.50	11.45	10.55

Key: CO = carbon monoxide; HC = hydrocarbon; NO_x = nitrogen oxides; RFG = reformulated gasoline.

Source: U.S. Environmental Protection Agency, National Vehicle and Fuel Emissions Laboratory, personal communication, August 8, 2007.

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