Table 4-29: Federal Exhaust Emission Certification Standards for Newly Manufactured Gasoline- and Diesel-Powered Light-Duty Vehicles

Table 4-29: Federal Exhaust Emission Certification Standards for Newly Manufactured Gasoline- and Diesel-Powered Light-Duty Vehicles

(Grams per mile)

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Engine type and pollutant Prior to controld 1968-
1969
1970-
1971
1972 1973-
1974
1975-
1976
1977-
1979
1980 1981 1982-
1986
1987-
1993
Tier 1i
1994-2003b
Interim Tier 2i
2004-2006
Tier 2i
2007+
Gasoline    
HC (total) 11 g 2.2 3.4 3.4 1.5 1.5 0.41 0.41 0.41 0.41 0.41 (h) h h
NMHC e h h h h h h h h h h 0.25 (0.31) h h
NMOG e h h h h h h h h h h h 0.125 (0.156) 0.100 (0.125)
CO 80 g 23 39 39 15 15 7.0 3.4 3.4 3.4 3.4 (4.2) 3.4 (4.2) 3.4 (4.2)
Cold-temp. COc e h h h h h h h h h h 10 (h) 10 (h) 10 (h)
NOx 4 h h h 3.0 3.1 2.0 2.0 1.0 1.0 1.0 0.4 (0.6) 0.4 (0.6) 0.14 (0.20)
Particulates e h h h h h h h h h h 0.08 (0.10) 0.08 (0.08) 0.02 (0.02)
Formaldehyde e h h h h h h h h h h h 0.015 (0.018) 0.015 (0.018)
Diesel  
HC (total) 11 h h h h 1.5 1.5 0.41 0.41 0.41 0.41 0.41 (h) h h
NMHC e h h h h h h h h h h 0.25 (0.31) h h
NMOG e h h h h h h h h h h h h (0.156) 0.100 (0.125)
CO 80 h h h h 15 15 7.0 3.4 3.4 3.4 3.4 (4.2) h (4.2) 3.4 (4.2)
NOx 4 h h h h 3.1 2.0 2.0 1.0 1.0 1.0 1.0 (1.25) h (0.6) 0.14 (0.20)
Particulates e h h h h h h h h 0.60 0.20 0.08 (0.10) h (0.10) 0.02 (0.02)
Formaldehyde e h h h h h h h h h h h h (0.018) 0.015 (0.018)
Test procedure    7-mode 7-mode CVS-72 CVS-72 CVS-75 CVS-75 CVS-75 CVS-75 CVS-75 CVS-75 CVS-75 CVS-75 CVS-75
Useful life (intermediate)b,f   h h h h h h h h h h 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles
Useful life (full)   5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 5 years/50,000 miles 10 years/100,000 miles 10 years/100,000 miles 10 years/120,000 miles

KEY: CO = carbon monoxide; HC = hydrocarbons; NMHC = non-methane hydrocarbons; NMOG = nonmethane organic gases; NOx = nitrogen oxides.

a The test procedure for measuring exhaust emissions has changed several times over the course of vehicle emissions regulations. The 7-mode procedure was used through model year 1971 and was replaced by the CVS-72 procedure beginning in model year 1972. The CVS-75 procedure became the test procedure as of model year 1975. While it may appear that the total HC and CO standards were relaxed in 1972-74, these standards were actually more stringent due to the more stringent nature of the CVS-72 test procedure. Additional standards for CO and composite standards for NMHC and NOx tested under the new Supplemental Federal Test Procedure will be phased-in beginning with model year 2000; these standards are not shown in this table.

b All emissions standards must be met for a useful life of 5 years/50,000 miles. Beginning with model year 1994, a second set of emissions standards must also be met for a full useful life of 10 years/100,000 miles; these standards are shown in parentheses. Tier 1 exhaust standards were phased-in during 1994-96 at a rate of 40%, 80%, and 100%, respectively.

c The cold CO emissions standard is measured at 20 degrees F (rather than 75 degrees F) and is applicable for a 5-year/50,000-mile useful life.

d The "Prior to control" column reports emissions estimates of a typical newly manufactured car in the years before exhaust emissions certification standards were implemented.

e No estimate available.

f Manufacturers can opt to certify vehicles for a full useful life of 15 years/150,000 miles and have either 1) intermediate useful life standards waived or 2) receive additional NOx credits.

g In 1968-69, exhaust emissions standards were issued in parts per million rather than grams per mile and are, therefore, incompatible with this table.

h No standard has been set.

i The term "tier" refers to a level of standards and is associated with specific years. Interim Tier 2 refers to an intermediate level of standards that move manufacturers toward compliance with Tier 2 standards. Interim Tier 2 and Tier 2 standards are established as "bins." Each bin is a set of standards for NOx, CO, NMOG, formaldehyde, and particulate matter; HC and NMHC standards are dropped for Tier 2 and Interim Tier 2. Manufacturers may certify any given vehicle family to any of the bins available for that vehicle class as long as the resulting sales-weight corporate average NOx standard is met for the full useful life of the vehicle. The Tier 2 corporate average NOx standard is 0.07 grams/mile. Interim corporate-based average NOx standards are based on vehicle type. The interim sales-weighted average for light-duty vehicles (LDVs) is 9.3 grams/mile. For LDVs, Tier 2 standards will be phased in at a rate of 25% in 2004, 50% in 2005, 75% in 2006, and 100% in 2007. During this period, all LDVs not meeting the Tier 2 standards must meet Interim Tier 2 standards.

SOURCE:

40 CFR 86, Subpart A (July 1, 2000) Federal Register, Vol. 65, No. 28, pp. 6851-6858.