x>EPA
mieJ Sine--, Office of Transportation EPA420-F-04-034
menwl P,ot«clton and Ajr Qua|jty May 2004
Resource
Information
EPA Diesel Milestones Since the
Clean Air Act Amendments of 1990
1993 Highway Low Sulfur Diesel Rule: For the first time, the
Agency limits sulfur content of highway diesel fuel to 500 parts
per million (ppm).
1994 Urban Bus Program: New standards and retrofit requirements
for urban buses.
1997 Locomotive Rule: Emission standards for nitrogen oxides
(NOx), hydrocarbons, carbon monoxide, particulate matter, and
smoke for new and re-manufactured diesel-powered locomotive
engines.
1998 Tier 2 and 3 Nonroad Diesel Rule: Emissions standards for
new diesel engines used in nonroad construction, agricultural,
airport and industrial equipment, as well as in certain marine
applications. Very few of these engine categories had emission
standards in place before the mid-1990s.
2004 Highway Diesel Standards: Emission standards to reduce NOx
and hydrocarbons from heavy-duty diesel trucks and buses to be
implemented in 2004.
1999 Commercial Marine Diesel Rule: Final rule to reduce nitrogen
oxides and particulate matter emissions from new large marine
diesel engines. These engines are used in a variety of capacities,
including fishing boats, tug and tow boats, coastal and Great
Lakes cargo vessels.
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2000 2007 Clean Diesel Truck/Bus and Low Sulfur Diesel Rule:
Comprehensive national control program that will regulate
heavy-duty diesel trucks and buses and highway diesel fuel as a
single system. These new standards will apply to model year
2007 engines and vehicles. Also, reduces sulfur in highway
diesel fuel by 97 percent (15 ppm) by mid-2006.
Voluntary Diesel Retrofit Program: Reduce pollution resulting
from existing diesel vehicles and equipment by encouraging fleet
owners to install pollution-reducing devices on vehicles and to
use cleaner-burning diesel fuel.
2002 Recreational Marine: Applied similar standards from 1999
commercial marine diesel rule to recreational marine diesel
2003 Ocean-Going Vessels: Emissions standards for new marine
diesel engines on U.S. flagged ocean-going vessels.
Clean Air Nonroad Diesel Proposal: Proposal to further reduce
emissions from nonroad diesel engines used in construction,
mining, industrial, airport and agricultural equipment.
Clean School Bus USA Program: Reduces children's exposure
to diesel exhaust by eliminating unnecessary school bus idling,
installing effective emission control systems on newer buses, and
replacing the oldest buses in the fleet with newer ones.
2004 Clean Air Nonroad Diesel Rule: The most recent nonroad
standards will dramatically reduce emissions by over 90 percent
from nonroad diesel equipment and dramatically reduce sulfur
levels by 99 percent from current levels in nonroad diesel fuel
starting in 2007. This step will apply to most nonroad diesel fuel
in 2010 and to fuel used in locomotives and marine vessels in
2012.
Locomotive and Marine Diesel Engine Standards: EPA is
issuing an Advance Notice of Proposed Rule and is inviting
comment on a plan to propose more stringent emission standards
and other provisions for new and existing locomotives, and new
marine diesel engines.
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