Table 4-29: Federal Exhaust Emission Certification
Standards for Newly Manufactured Gasoline- and Diesel-Powered Light-Duty
Vehiclesa,b
(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.
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