Office of Advocacy
U.S. Environmental Protection
Agency
Proposal for Cleaner Heavy-Duty Trucks and Buses
and Cleaner Diesel Fuel
Fact Sheet
May 17, 2000
The Environmental Protection Agency is proposing
more stringent emission standards for heavy-duty vehicles that
would reduce smog-causing emissions from trucks and buses by 95
percent beyond current levels. Soot emissions also would be
reduced by 90 percent beyond current levels. In order to meet
these more stringent standards for diesel engines, the proposal
requires the sulfur content of diesel fuel to be capped at 15
parts per million a 97 percent reduction. EPA plans to
finalize these standards by the end of the year, and the
standards will take effect in 2006 - 2007.
Health Concerns
- There is great concern about the adverse health effects
associated with exposure to diesel exhaust. Exposure is
widespread, particularly in urban areas, and according to
several national and international agencies, there is
increasing evidence that diesel exhaust or diesel
particulate matter (soot) may cause lung cancer in
humans. Non-cancerous effects such as lung damage and
respiratory problems are also associated with exposure to
diesel exhaust.
Heavy-Duty Trucks and Buses
- In 2007, when the proposed emission standards would begin
to take effect, heavy-duty trucks and buses would
contribute more than half of nitrogen oxide and
particulate matter emissions from all highway vehicles.
In some urban areas, the contribution would be even
greater.
- An older, dirtier diesel vehicle can emit almost 8 tons
of pollution per year. This amounts to 160 to 240 tons of
pollution over the life of the engine.
- The proposal would require low-sulfur diesel fuel
beginning in 2006. Since heavy-duty diesel vehicles often
travel across state lines, low-sulfur diesel fuel must be
available nationwide to ensure the effectiveness of new
pollution control devices.
- Diesel engines are more durable and have higher fuel
economy than gasoline engines. The cleaner diesel fuel
and new clean diesel engines required by this proposal
will add "clean" to durable and economic when
describing these trucks and buses.
Proposed Standards
- EPA is proposing a particulate matter (soot) emission
standard for new heavy-duty engines of 0.01 grams per
brake-horsepower-hour (g/bhp-hr), to take full effect in
the 2007 model year. The current soot standard is 0.1
g/bhp-hr.
- EPA is also proposing standards for smog-causing nitrogen
oxides (NOx) and hydrocarbons (HC) of 0.20 g/bhp-hr and
0.14 g/bhp-hr, respectively. The current standard for NOx
is 4 g/bhp-hr and the HC standard is 1.3 g/bhp-hr. These
standards will be phased-in for diesel vehicles between
2007 and 2010. Gasoline vehicles would have to meet these
standards in 2007.
- The sulfur content of diesel fuel, used in highway
vehicles, would be limited to a cap of 15 parts per
million (ppm) beginning June 1, 2006. The current
standard is a cap of 500 ppm.
Benefits of EPAs Proposal
- As a result of EPAs proposal, each new truck and
bus would be as much as 95 percent cleaner than
todays trucks and buses.
- The proposal would reduce emissions of smog-causing
(nitrogen oxides) by 2.8 million tons each year when the
program is fully implemented in 2030. Emissions of soot
(particulate matter) would be reduced by 110,000 tons
each year.
- Reducing diesel exhaust will result in a significant
reduction -- almost 33,000 tons each year -- of toxic air
pollutants (such as benzene), many of which are known
human carcinogens.
- The proposal is equivalent to removing the pollution
created by 13 million of todays trucks.
- This proposed program will ensure that every American
will breathe cleaner air. Many states will need to reduce
smog-causing and soot emissions, to attain national air
quality standards by the required 2007 - 2010 timeframe.
This proposal, in combination with other clean air
programs, will ensure that a significant number of areas
across the country, with a population of more than 120
million people, will be able to meet and maintain
EPAs national air quality standards.
Costs of EPAs Proposal
- The cost of reducing the sulfur content of diesel fuel
would result in an estimated increase of approximately
three to four cents per gallon.
- EPA estimates that vehicle costs would increase from
$1,000 to $1,600 depending on the size of the vehicle. To
put this in perspective, new heavy-duty trucks can cost
as much as $150,000 and buses can cost $250,000.
- These cost impacts are small when we consider the costs
over the life-span of the engine. Heavy duty engines tend
to stay in operation for much longer periods of time than
passenger cars. Trucks and buses can remain in operation
for up to 30 years or 1,500,000 miles. In comparison, the
average passenger car stays on the road for 10 years or
100,000 miles.
Flexibility Mechanisms
- In order to assure no disruption in fuel supply, EPA
designed this proposal to include significant lead time
for the introduction of this new cleaner fuel into the
marketplace. The proposal also discusses various flexible
phase-in approaches for the diesel fuel industries to
facilitate the complete transition to new clean diesel
fuel and to further reduce costs. Also, we are requesting
comment on ways to provide additional flexibility to
assist small refiners in complying with the program.
- For engine manufacturers, the proposed program allows
phase-in of the new standards over four years
(2007-2010). Manufacturers would have to meet the
standards for nitrogen oxides and hydrocarbons under the
following phase in schedule: 25 percent in 2007, 50
percent in 2008, 75 percent in 2009, and 100 percent in
2010. Standards for particulate matter (soot) would go
into effect in 2007.
For More Information
- The proposed rule and related documents can be accessed
electronically on the Office of Transportation and Air
Quality Web site at: http://www.epa.gov/otaq/diesel.htm
- We welcome your comments on this proposal. For
instructions on submitting written comments, please see
the Federal Register notice. You may submit
written comments to EPA up to August 14, 2000. Please
refer to Docket No. A-99-06. The address for submitting
written comments is: Margaret Borushko (Docket No.
A-99-06), U. S. Environmental Protection Agency, Office
of Transportation and Air Quality, 2000 Traverwood Drive,
Ann Arbor, MI 48105. You may also submit comments by
email to diesel.group@epa.gov.
Public hearings will be held in:
- New York City - June 19, 2000 - Crown Plaza Hotel
- Chicago - June 20, 2000 - Rosemont Convention Center
- Atlanta - June 22, 2000 - Renaissance Atlanta Hotel
- Los Angeles - June 27, 2000 - Hyatt Regency
- Denver - June 29, 2000 - Doubletree Hotel
- Additional information about the hearings will be
published in a supplemental notice in the Federal
Register in the near future.
* Last Modified: 6/11/01