RNS Number:5433I
Clean Diesel Technologies, Inc
11 March 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 March 11, 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 TO LICENSE NOX REDUCTION TECHNOLOGY
                         FOR DIESEL VEHICLES IN NORTH AMERICA

               System Reduces NOx over 70 Percent from Existing Engines


STAMFORD, CT (March 11, 2003) . . . Clean Diesel Technologies, Inc. (CDT) (EBB:
CDTI & AIM:CDT/CDTS)  and privately held Combustion Component Associates, Inc.
(CCA) of Monroe, CT announced today that they have signed a letter of intent for
the manufacture and sale of CDT's ARIS(R) urea Selective Catalytic Reduction
(SCR) NOx reduction system for retrofit to diesel vehicles in the US and Canada.
Heavy-duty diesel engines account for a significant portion of NOx emissions,
and the SCR NOx system is capable of 70-90 percent NOx reduction from diesel
engines.  NOx is a regulated pollutant and a major contributor to ground-level
ozone.

Subject to a definitive agreement expected in the next 30 days, CCA will pay CDT
an upfront license fee for a non-exclusive license, commit to further
expenditures for development and verification under EPA and California Air
Resources Board testing protocols, and pay CDT running royalties on system
sales.  According to Mr. R. Gifford Broderick, President of CCA, "We have
demonstrated the ELIM-NOxTM system, which utilizes CDT's patented return flow
ARIS injection technology, on a medium-duty delivery van and achieved over 70
percent NOx reduction in normal operation.  CCA has also developed an in-service
method of 'mapping' a vehicle's NOx emissions without the need to take the
vehicle out of service for costly dynamometer testing.  Mapping of the engine
provides the data inputs necessary to program the system computer that controls
the rate of urea injection and overall NOx reduction."  CCA will be displaying
its ELIM-NOx system at the Technology and Maintenance Council (TMC) annual
meeting in Florida during the week of March 10, 2003.

CDT President, Mr. James Valentine, stated, "CCA has made a commitment in the
staffing, development and marketing of the ARIS injection system and we are
pleased to have them join our worldwide network of licensees for the ARIS
technology.  Other licensees include RJM for stationary diesel applications in
the Americas, and Mitsui through its DeNOx affiliate and PurEARTH subsidiary for
stationary and mobile applications in Japan.  We are also in demonstrations and
discussions with several parties in Europe about potential licensing agreements.
"

                                 MORE-MORE-MORE

               CLEAN DIESEL TO LICENSE NOX REDUCTION TECHNOLOGY

Page 2-2-2

Both on-highway and off-road mobile applications will be covered under the
agreement with CCA as well as portable diesel engines.

Urea SCR reduces NOx through precision injection of controlled amounts of
non-toxic urea reagent into the engine exhaust.  There it reacts across a
catalyst to reduce NOx to elemental nitrogen and water vapor.  Urea SCR allows
an engine to be tuned for maximum fuel economy and minimum particulate emissions
while effectively reducing NOx by up to 95 percent.  Used in conjunction with
exhaust gas recirculation (EGR), the combination of EGR and SCR can achieve the
2007 NOx standards for new engines.  CDT also holds a patent on the EGR/SCR
combination.

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 statement"
within the meaning of the Private Securities Litigation Reform Act of 1995.
Such forward-looking statement 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.


                                    # # # #


                      This information is provided by RNS
            The company news service from the London Stock Exchange
END
AGRILFLTVDIILIV