EPA Sets Tier 3 Motor Vehicle
Emission and Fuel Standards
The U.S. Environmental Protection Agency (EPA) is finalizing an
important rule designed to reduce air pollution from passenger
cars and trucks. Starting in 2017, Tier 3 sets new vehicle emissions
standards and lowers the sulfur content of gasoline, considering the
vehicle and its fuel as an integrated system.
The Tier 3 vehicle standards reduce both tailpipe and evaporative emissions
from passenger cars, light-duty trucks, medium-duty passenger vehicles, and
some heavy-duty vehicles.
The Tier 3 gasoline sulfur standard will make emission control systems more
effective for both existing and new vehicles, and will enable more stringent
vehicle emissions standards. Removing sulfur allows the vehicle's catalyst to
work more efficiently. Lower sulfur gasoline also facilitates the development
of some lower-cost technologies to improve fuel economy and reduce green-
house gas (GHG) emissions, which reduces gasoline consumption and saves
consumers money.
The tailpipe standards include different phase-in schedules that vary by
vehicle class but generally phase in between model years 2017 and 2025. In
addition to the gradual phase-in schedules, other flexibilities include credits
for early compliance and the ability to offset some higher-emitting vehicles
with extra-clean models.
The fuel sulfur standards include an averaging, banking, and trading (ABT)
program that will allow refiners and importers to spread out their investments
through an early credit program and rely on ongoing nationwide averaging to
meet the sulfur standard. EPA is also finalizing flexibilities such as the ability
to carry over credits from Tier 2 to Tier 3 and hardship provisions for extenu-
ating circumstances, as well as flexibility provisions for small businesses (small
manufacturers of Tier 3 vehicles and small refiners), small volume manufac-
turers, and small volume refineries.
SEPA
United States
Environmental Protection
Agency
Office of Transportation and Air Quality
EPA-420-F-14-009
March 2014
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The Tier 3 program continues the successful transition that began with EPA's Tier 2 pro-
gram, finalized in 2000, in which EPA treated vehicles and fuels as a system to reduce
both gasoline sulfur and vehicle emissions. While there were claims at the time that the
program would cause fuel prices to increase far in excess of EPA's estimates and would
result in closures and fuel supply shortages, the Tier 2 program was a success and resulted
in gasoline sulfur reductions of up to 90 percent and enabled the use of new emission
control technologies in cars and trucks with no serious negative impacts on the refining
industry. EPA's Clean Diesel Program similarly utilized a systems approach to reducing
sulfur emissions from diesel fuels and enabling cleaner diesel technologies with the
Highway Diesel Rule (finalized in 2001) and the Nonroad Diesel Rule (finalized in 2004)
again with no serious negative impacts. Now that the U.S. refining industry routinely
produces lower sulfur fuel products, new market opportunities for international fuel
exports have opened up,
EPA is finalizing the Tier 3 program largely as proposed. EPA received a large number
and wide range of comments on the proposed rule, and the final Tier 3 program is based
both on this extensive public input and updated analyses of the rule's impacts. EPA
sought comment on the level of the per-gallon sulfur cap (which applies in addition to
the annual average), and has decided to maintain the per-gallon caps at existing levels,
EPA is also finalizing an ethanol content of 10 percent (E10) for emissions test gasoline
(as opposed to the proposed 15 percent ethanol (E15) test fuel).
Benefits and Costs of the Rule
These Tier 3 standards will address public health issues that exist currently and are projected to
continue in the future as requested in a May 21, 2010 Presidential memorandum,
^ Over 149 million Americans are currently experiencing unhealthy levels of air pollution
which are linked with adverse health impacts such as hospital admissions, emergency
room visits, and premature mortality. Motor vehicles are a particularly important source
of exposure to air pollution, especially in urban areas,
> The vehicle emission standards combined with the reduction of gasoline sulfur content
will significantly reduce motor vehicle emissions, including nitrogen oxides (NOX),
volatile organic compounds (VOC), direct particulate matter (PM2.5), carbon monoxide
(CO) and air toxics,
> Compared to current standards, the non-methane organic gases (NMOG) and nitrogen
oxides (NOX), presented as NMOG+NOX, tailpipe standards for light-duty vehicles
represent approximately an 80% reduction from today's fleet average and a 70%
reduction in per-vehicle particulate matter (PM) standards. The heavy-duty tailpipe
standards represent about a 60% reduction in both fleet average NMOG+NOX and per-
vehicle PM standards. EPA is also extending the regulatory useful life period during
which the standards apply from 120,000 miles to 150,000 miles.
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^ Under the final Tier 3 program, federal gasoline will not contain more than 10 parts per
million (ppm) of sulfur on an annual average basis by January 1, 2017. EPA is also final'
izing standards that maintain the current 80 ppm refinery gate and 95 ppm downstream
cap. The Tier 3 gasoline sulfur standards are similar to levels already being achieved in
California, Europe, Japan, South Korea, and several other countries,
^ Emission reductions from the Tier 3 program will lead to immediate air quality improve'
ments that are critically important for states to attain and maintain the existing health'
based National Ambient Air Quality Standard (NAAQS). In the absence of additional
controls such as the Tier 3 standards, many areas will continue to have air pollution
levels that exceed the NAAQS in the future.
Tier 3 will also reduce exposure to vehicle pollution for the millions of people living, working,
and going to school near major roads.
Tier 3 is among the most highly cost'effective air quality control measures available,
> The program is projected to cost less than a penny per gallon of gasoline, and about $72
per vehicle. The annual cost of the overall program in 2030 is projected to be approxi-
mately $1.5 billion; however, EPA estimates that in 2030 the annual monetized health
benefits of the Tier 3 standards will be between $6.7 and $19 billion,
> Through the use of more recent and robust cost analysis, EPA estimates that the cost of
the total Tier 3 program (vehicle and fuel standards) will be less than half of what we
projected in the proposal,
^ By 2030, the Tier 3 standards will annually prevent:
• Between 770 and 2,000 premature deaths
• 2,200 hospital admissions and asthma-related emergency room visits
• 19,000 asthma exacerbations
• 30,000 upper and lower respiratory symptoms in children
• 1.4 million lost school days, work days and minor-restricted activities
By 2030, the Tier 3 standards will also reduce numerous tons of harmful emissions.
Table 1 illustrates the projected tons of emission reductions in 2018 and 2030,
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Table 1
Estimated Emission Reductions from the Final Tier 3 Standards
(Annual U.S. short tons)
NOX
voc
CO
Direct PM25
Benzene
S02
1,3-Butadiene
Formaldehyde
Acetaldehyde
Acrolein
Ethanol
2018
Tons
264,369
47,504
278,879
130
1,916
14,813
257
513
600
40
2,704
Percent
of On road
Inventory
10%
3%
2%
0.1%
6%
56%
5%
2%
3%
3%
2%
2030
Tons
328,509
167,591
3,458,041
7,892
4,762
12,399
677
1,277
2,067
127
19,950
Percent
of On road
Inventory
25%
16%
24%
10%
26%
56%
29%
10%
21%
15%
16%
The Tier 3 program is part of a comprehensive approach to reducing the impacts of motor
vehicles on air quality and public health,
> Tier 3 is harmonized with the California Air Resources Board (GARB) Low Emission
Vehicle (LEV III) program so automakers could sell the same vehicles in all 50 states,
> Tier 3 is aligned with and designed to be implemented over the same timeframe as EPA's
program for reducing greenhouse gas (GHG) emissions from light-duty vehicles starting
in model year 2017.
> Together, the Tier 3, light-duty GHG, and LEV III standards will maximize reductions
in GHGs, criteria pollutants and air toxics from motor vehicles while streamlining
programs and providing regulatory certainty and compliance efficiency.
This final rule is based on extensive public input received in response to the Tier 3 proposal,
EPA held two public hearings in Philadelphia and Chicago, and we received more than 200,000
public comments. A broad range of stakeholders provided comments, including state and local
governments, auto manufacturers, emissions control suppliers, refiners, fuel distributors and others
in the petroleum industry, renewable fuels providers, environmental organizations, consumer
groups, labor groups, private citizens, and others. EPA has also had extensive outreach with key
stakeholders throughout the development of this rule.
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For More Information
You can access the final rule, regulations and related documents on EPA's Office of Transporta-
tion and Air Quality (OTAQ) Web site at:
www.epa.gov/otaq/tier3 .htm
For more information on this rule, please contact the U.S. Environmental Protection Agency,
Office of Transportation and Air Quality at:
E-mail: otaq@epa.gov
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