Table 4-39:  Estimated National Average Vehicle Emissions Rates by Vehicle Type Using Reformulated Gasoline (Grams per mile),,,,,,,,,
,1995,1996,1997,1998,1999,2000,2001,2002,2003
Light-duty vehicles,,,,,,,,,
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,,,,,,,,,
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,,,,,,,,,
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,,,,,,,,,
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,,,,,,,,,
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.,,,,,,,,,
,,,,,,,,,
SOURCE,,,,,,,,,
"U.S. Environmental Protection Agency, National Vehicle and Fuel Emissions Laboratory, personal communications, July 31, 2002 and Nov. 26, 2003. ",,,,,,,,,
,,,,,,,,,
,,,,,,,,,

,,,,,,,,,
,,,,,,,,,