Advanced Atmospheric Studies

"The Cray XD1 supercomputer greatly strengthens the numerical modeling
capabilities that make it possible for us to simulate atmospheric,
dispersion , and air-quality processes as part of our ongoing and future
Department of Defense projects," said Dr.

As the global leader in HPC, Cray provides innovative supercomputing
systems that enable scientists and engineers in government, industry and
academia to meet both existing and future computational challenges. For more information
please refer to www.

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"The ratio was closer for the PC cluster, but that solution presented
too many drawbacks given the mission-critical tasks we wanted to accomplish
with the machine.
EPA alleges that Concast violated performance standards for new pollution
sources by failing to test one of its electric melting furnaces for opacity
(the amount of light obscured by smoke particles) and for operating the
furnace without determining that it meets opacity limits.

epa airlinks

"We will take whatever steps are
needed to ensure compliance with the Clean Air Act.

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"

"The Cray XD1 system will also give us the ability to map the wind-energy
potential in Nevada and California through all four seasons at a resolution
of two kilometers or less," Dr. "We will be able to use
computationally intensive numerical techniques such as large-eddy
simulations to predict turbulence and dispersion down to the scale of
individual urban and suburban areas.com for more
information. At any given time DRI researchers are
engaged in some 100 projects focusing on environmental monitoring,
assessment, prediction and policy implementation.dri.

The alleged
violations were discovered through an EPA information request.

Business Editors/Environment Writers/Transportation Writers

NEWARK, Del.
StarTran, the municipal transit authority in Lincoln , NE, is the
first U. "The City of Lincoln, StarTran and
CityHome sponsors including the Nebraska Corn Board, the Nebraska Corn
Growers, the Nebraska Ethanol Board, Patriot Motorcycles and The
Financial Times are to be applauded for their vision and getting
involved in such an innovative and beneficial program.

stakeholder polluter

PRESS RELEASE Researchers at DRI Rely on Cray XD1 Supercomputer to Unravel Environmental Mysteries

To resolve them, EPA may
issue a compliance order, assess an administrative penalty or bring suit
against the company.S."
CityHome is the result of an innovative partnership involving
municipal transit systems, O2Diesel and corporate sponsors, whose
contributions offset the program costs to the transit operators.

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Koracin
specializes in studying and predicting atmospheric flows and the transport
and dispersion of airborne pollutants and tracer substances over complex
terrain and oceans by developing and using high-resolution meteorological,
dispersion and air-quality models and other computer-based tools."





DRI Web Site


"The DRI installation further confirms the rich potential that the Cray XD1
supercomputer holds for earth science research," said Per Nyberg, Cray's
Earth Sciences Business Manager.

The benchmarks showed that the Cray XD1 system performed 17-25% faster than
the ccNUMA system and 50 -75% faster than the PC cluster, depending on the
number of processors.
Building on years of experience in designing, developing, marketing and
servicing the world's most advanced supercomputers, Cray offers a
comprehensive portfolio of HPC systems that deliver unrivaled sustained
performance on a wide range of applications. CHICAGO, U.----

Lincoln, Nebraska's StarTran is First to Convert Bus Fleet to
O2diesel's Ethanol-Diesel Fuel Technology

O2Diesel Corporation (AMEX:OTD) tomorrow inaugurates the
CityHome(TM) program, a major national clean air initiative designed
to improve quality of life in local communities by helping municipal
transit systems significantly reduce diesel fuel emissions, and doing
so at no additional cost to the transit systems."

More About O2Diesel: The Company and Its Fuel Technology.

epa particulate

The benchmark tests
were conducted using PSU/NCAR atmospheric simulation modeling software,
known as MM5."

About the Cray XD1 Supercomputer

The Cray XD1 supercomputer combines direct-connect system architecture ,
HPC-optimized Linux, management and reconfigurable computing technologies
to deliver exceptional performance on real-world applications. Skinner. Engineered and designed
for universal application , O2Diesel(TM) is an ethanol-diesel blend
treated with the company's proprietary soybean oil-derived stabilizing
additive that substantially reduces harmful emissions without
sacrificing power and performance.

psd supersites

About the Desert Research Institute

DRI is an autonomous division of the University and Community College
System of Nevada employing approximately 440 faculty and staff.

edu for
more information.S. city to convert its entire available fleet of 67 transit
and paratransit coaches to O2Diesel's ethanol-diesel fuel blend, known
as O2Diesel(TM), which reduces black smoke , particulate matter and
exhaust gases shown to be unhealthy and damaging to the environment. Reducing harmful diesel emissions, the
report says, can also help reduce serious public health problems such
as asthma attacks, respiratory disease, heart attacks and premature
death.o2diesel.

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for alleged clean-air violations at
the company's bronze ingot production plant at 14315 state Route 113,
Birmingham , Ohio.
StarTran converted its bus fleet to O2Diesel after three years of
extensive testing and monitoring, and has been operating coaches using
O2Diesel exclusively since mid-February.

airshed aerosols

cray."
These are preliminary findings of violations.

O2Diesel Debuts CityHome a Major Clean Air Initiative to Help Transit Authorities Lower Diesel Emissions and Improve Quality of Life

Sponsors allocate specific marketing budgets to support CityHome
through transit advertising.

wildland particulates

"

Top Benchmark Results

Before making their choice, DRI tested a Cray XD1 system along with two
other platforms: a ccNUMA system equipped with Intel Itanium 2 1. "Based on the benchmark results, the
price/performance ratio of the Cray XD1 system is far better than that of
the ccNUMA system," said Domagoj Podnar, a research computer scientist at
DRI. The Cray XD1
system also provides application acceleration capabilities using FPGA
technology, tightly connected to the direct-connect structure. Environmental Protection Agency
Region 5 has cited Concast Birmingham Inc. "O2Diesel" and
"CityHome" are trademarks of O2Diesel Corp.

Information, organizations, research, information and services that are concerned with improving air quality.

particulates stratospheric

With main
campuses in Las Vegas and Reno, DRI represents a unique blend of academia
and entrepreneurship, combining basic research in the earth sciences with
applied interdisciplinary studies.
Inhaling high concentrations of particulates (dust, smoke, ash) can affect
children , the elderly and people with heart and lung diseases the most. "We see CityHome as a model program that
can become a launch pad for large-scale implementations in major
cities around the country, where curbing diesel pollution is an even
bigger challenge.

brownfields epa

Cray XD1
supercomputers have also been installed at the USDA Forest Service's Fire
Sciences Laboratory in Montana and at the Alfred Wegener Institute for
Polar and Marine Research in Bremerhaven, Germany. Go to www.
According to a recent study commissioned by the Clean Air Task
Force, a Boston-based non-profit environmental organization,
approximately 20,000 Americans die annually as a result of diesel
engine-related pollution. Extensive independent and
government-recognized laboratory and in-use field tests have
demonstrated the effectiveness of O2Diesel(TM) -- the introduction of
this cost-effective, cleaner-burning diesel fuel is now underway in
the United States and other global markets.com

Forward-Looking Statements

"Safe Harbor" Statement under the Private Securities Litigation
Reform Act of 1995: Statements in this press release regarding
O2Diesel Corp's business which are not historical facts are
"forward-looking statements" that involve risks and uncertainties.

airshed stakeholder

Koracin added.

About Cray Inc.

Cray is a registered trademark, and Cray XD1 is a trademark, of Cray Inc.

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Koracin.

O2Diesel Corporation (AMEX:OTD) is a pioneer in the commercial
development of a cleaner-burning diesel fuel alternative that provides
excellent performance and environmental benefits for centrally fueled
fleets and off-road equipment of all kinds.

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For a discussion of
these and other risks, see "Factors That Could Affect Future Results" in
Cray's Annual Report on Form 10-K for the year ended December 31, 2004 ,
filed with the Securities and Exchange Commission.

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Dr. CityHome plans to roll-out its clean air
program to other cities in the Midwest, Texas, California and the east
coast throughout the coming year.

emissions edf

"For example, the Cray
XD1 system's processing power will let us integrate transport modeling
systems into forecasting and short-term 'nowcasting' systems, so we can
predict the impact of events such as chemical emissions or biological
plumes on surrounding communities.

rivm stakeholder

"With its exceptional performance
characteristics and scalability that outstrips systems of similar size, the
Cray XD1 system can deliver the computational power that the earth sciences
community demands, while also meeting budgetary requirements. Concast has 30 days from receipt of the notice to meet
with EPA to discuss resolving the allegations.

rivm pollution

Global supercomputer leader Cray Inc.S. These
models can be employed in studies ranging from pollution control and
bio-warfare to energy production , weather modification and air-sea
interaction.
"CityHome represents a tremendous leap forward in helping cities
tackle the problem of noxious diesel emissions that, until now, were
inherent with traditional diesel-fueled bus fleets," said Alan Rae,
president and CEO of O2Diesel.

wildland particulates

(NASDAQ: CRAY) today announced that Nevada's Desert Research Institute (DRI) has
chosen the Cray XD1 supercomputer as a key computational platform for
carrying out environmental research that involves high-resolution modeling
and complex forecasting. These include the successful
porting of application programs to Cray systems, the successful passing of
acceptance tests and reliance on third-party suppliers .

EPA Cites Concast Birmingham for Clean-Air Violations

CityHome not
only enables cities to reduce diesel emissions from their transit
buses, but also creates an opportunity for environmentally-conscious
corporations to take an active role in helping their communities. For
a discussion of such risks and uncertainties, which could cause actual
results to differ from those contained in the forward -looking
statements, see "Risk Factors" in the Company's Annual Report or Form
10-K for the most recently ended fiscal year.

emissions ozone

Darko Koracin,
principal investigator and a research professor at DRI .3 GHz
processors and a high-speed interconnect, and a PC cluster using Intel Xeon
2.8 GHz processors and a Gigabit Ethernet interconnect.
Purpose-built for demanding HPC applications such as computational
chemistry, environmental forecasting and CAE, the Cray XD1 system lets
users simulate, analyze and solve complex problems more quickly and
accurately. Go to www.

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The Cray XD1 system was purchased with an award from the U. Defense
University Research and Instrumentation Program given to Dr.

pollution particulates

To assess the scalability of each system, the number of
processors was increased in increments of four, up to 32 processors in the
case of the ccNUMA system and 24 processors for the PC cluster . The
x86-based Cray XD1 system supports a broad range of 32- and 64-bit HPC
applications on AMD Opteron single- or dual-core processors.

Safe Harbor Statement

This press release contains forward-looking statements. There are certain
factors that could cause Cray's execution plans to differ materially from
those anticipated by the statements above. All other trademarks are the property of their respective
owners.
"Through corporate sponsorships, CityHome makes it possible for
smaller urban fleets like StarTran to play a meaningful role in
helping improve air quality for Lincoln residents ," said Larry Worth,
Transit Manager, StarTran.

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By delivering superior performance and processing
scalability, DRI's 60-processor Cray XD1 system will help investigators
find solutions to pressing issues related to the earth's atmosphere, soil,
hydrology and ecosystems.
AMD, AMD Opteron and combinations thereof are trademarks of Advanced Micro
Devices, Inc.
"EPA's mission is to protect public health and the environment," said
Regional Administrator Thomas V.

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