RNS Number:7144K
Clean Diesel Technologies, Inc
06 May 2003


Clean Diesel Technologies, Inc.

300 Atlantic Street, Suite 702, Stamford, CT 06901-2522 Tel: (203) 327-7050 Fax: (203) 323-0461




NEWS RELEASE for  May 6, 2003 at 2:30 am EST and 7:30 am London time

Contact: Allen & Caron Inc        or       Clean Diesel Technologies, Inc.                                              
Jay F. McKeage (investors)                 James M. Valentine, President
(212) 691-8087                             David W. Whitwell, CFO                        
jay@allencaron.com                         (203) 327-7050
Len Hall (media)                                         
(949) 474-4300
len@allencaron.com

                        


                        
      CLEAN DIESEL SIGNS LICENSE AGREEMENT FOR DIESEL NOX REDUCTION TECHNOLOGY

             Patented EGR/SCR Combination Can Achieve 90 Percent Reduction

                    in Nitrogen Oxide Emissions

STAMFORD, CT (May 6, 2003) ... Clean Diesel Technologies, Inc. (CDT) (EBB:CDTI &
AIM:CDT/CDTS)  announced today that they have signed a definitive license
agreement with Monroe, CT-based Combustion Component Associates, Inc. (CCA) for
CDT's ARIS(R) urea selective catalytic reduction (SCR) technology designed to
reduce nitrogen oxide emissions by up to  90 percent from heavy-duty diesel
vehicles.  Under the license agreement, CCA will pay CDT $150,000 for the
license along with running royalties on systems sold, and will commit an
additional $100,000 towards development and EPA and California Air Resources
Board (CARB) verification programs for the mobile system.  The non-exclusive
license covers application of the technology to existing on-highway and off-road
mobile engines as well as portable diesel engines in the US and Canada.

Areas such as Houston, Dallas, Sacramento, Los Angeles and Atlanta are under
strong pressure to reduce NOx emissions from mobile diesel engines to meet local
ambient air quality standards.  Engine manufacturers in the US, Europe and Japan
are also looking to urea SCR to help meet more stringent emission regulations
for new vehicles beginning in 2005-2010.  CDT's patented combination of urea SCR
with exhaust gas recirculation (EGR) technology can already achieve the
2007-2010 NOx standards in the US.  Most US heavy-duty engine companies have
already begun to apply EGR for the first step of reduction required as of
October 2002 for new engines and will require a further 90 percent reduction in
emissions in the 2007-2010 period.  Urea SCR is likely to be the most
cost-effective technology to meet these future standards.

According to R.G. Broderick, President of CCA, "The ARIS urea injection system
provides CCA with a low cost, compact and patented technology base from which we
can quickly introduce a mobile urea SCR system to the market.  We have had good
response from fleets, regulators and engine distributors and expect limited
orders to begin in the second half of this year for commercial demonstration
programs. A ramp-up in commercial orders is expected once CARB/EPA verification
is completed."

                                 MORE-MORE-MORE




CLEAN DIESEL SIGNS LICENSE AGREEMENT FOR DIESEL

NOX REDUCTION TECHNOLOGY

Page 2-2-2



       CDT President James Valentine added, "We are glad to have CCA on
board as part of our growing network of ARIS licensees.  Together we will also
be exploring potential third-party alliances for the marketing and distribution
of the mobile ARIS retrofit package manufactured by CCA and using our patented,
single-fluid return-flow injection technology."

The ARIS NOx reduction system is a patented urea SCR technology that injects
non-toxic urea-based solution into the exhaust gas of a diesel engine upstream
of the SCR catalyst.  When mixed with nitrogen oxides in the exhaust, urea
reacts across the catalyst to convert NOx to elemental nitrogen and water vapor.
  The ARIS electronic control unit is programmed to control the ARIS urea
injector based on engine operating conditions and precisely injects the amount
of urea required to react with NOx in the exhaust, even as engine load and speed
change.


      Over a dozen ARIS injection systems have been supplied to engine
manufacturers, government agencies, catalyst companies and exhaust system
manufacturers to investigate the technology for mobile applications, and there
are more than 100 commercial ARIS NOx reduction systems operating on stationary
power generation diesels in the US and Japan, through licenses with Norwalk,
CT-based RJM Corporation for the Americas and Mitsui & Co. Ltd. for Japan.

About Combustion Component Associates, Inc.
Combustion Components Associates, Inc., founded in 1980, provides comprehensive
engineering, testing and hardware to the power and transportation industries for
the efficient combustion of fuel and reduction of air pollution. The company
utilizes the latest technology in computer modeling and laboratory test
equipment in the development and application of its technologies. Its products
and services are utilized by major utility generators and numerous Fortune 500
companies.

About Clean Diesel Technologies, Inc.
Clean Diesel Technologies, Inc. is a specialty chemical company with patented
products that reduce emissions from diesel engines while simultaneously
improving fuel economy and power.  Products include Platinum Plus(R) fuel
catalysts and the ARIS(R) 2000 urea injection systems for selective catalytic
reduction of NOx.  Platinum Plus and ARIS are registered trademarks of Clean
Diesel Technologies, Inc.

For more information contact Clean Diesel Technologies directly, or visit their
web site at www.cdti.com.

Certain statements in this news release constitute "forward-looking statements"
within the meaning of the Private Securities Litigation Reform Act of 1995.
Such forward-looking statements involve known or unknown risks, including those
detailed in the Company's filings with the Securities and Exchange Commission,
uncertainties and other factors which may cause the actual results, performance
or achievements of the Company, or industry results, to be materially different
from any future results, performance or achievements expressed or implied by
such forward-looking statements.  Readers are cautioned not to place undue
reliance on these forward-looking statements, which speak only as of the date
hereof.

                                    # # # #


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            The company news service from the London Stock Exchange
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