RNS Number:5131U
Clean Diesel Technologies, Inc
22 January 2004


Clean Diesel Technologies, Inc.

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







NEWS RELEASE for January 22, 2004 at 2:30 AM EST and 7:30 AM London Time

Contact:   Allen & Caron Inc                 or  Clean Diesel Technologies, Inc.
           Jay F. McKeage (US investors)         James M. Valentine, President
           (212) 691-8087; jay@allencaron.com    David W. Whitwell, CFO
           Len Hall (US media)                   (203) 327-7050
           (949) 474-4300; len@allencaron.com
           Bankside Consultants
           Simon Bloomfield (UK media/investors)
           44 (0)20 7444 4140; simon.bloomfield@bankside.com



 CLEAN DIESEL COMPLETES RIGOROUS TESTING OF NEW DIESEL EMISSION CONTROL SYSTEM
                    JOINTLY DEVELOPED WITH MITSUI SUBSIDIARY


          Receives Preliminary Posting to EPA Diesel Retrofit Website


STAMFORD, CT  (January 22, 2004) ... Clean Diesel Technologies, Inc. (CDT) (EBB:
CDTI & AIM:CDT/CDTS) announced today that it had completed testing of its new
fuel-borne catalyst (FBC) and catalyzed wire-mesh filter (CWMF) diesel-emission
reduction system under the rigorous Environmental Technology Verification (ETV)
protocol established by the US Environmental Protection Agency (EPA) to verify
retrofit technology.  The FBC/CWMF system uses CDT's patented Platinum Plus(R)
fuel-borne catalyst and a proprietary catalyzed wire-mesh filter supplied by
PUREarth, Inc. a wholly owned subsidiary of Mitsui & Co. Ltd.



Under the ETV Program, suppliers of commercial diesel retrofit technologies are
required to sign a contract with EPA's third-party administrator to conduct a
detailed engine test program at an independent EPA approved lab.  Completion of
testing by CDT has been noted on the EPA Voluntary Diesel Retrofit Program
website (http://www.epa.gov/otaq/retrofit/retroverifiedlist.htm) and final
emission-reduction results will be posted to the website once EPA and the
third-party administrator complete their final review of the data.



CDT and PUREarth have been working since December 2002 on several programs to
verify the emission-reduction performance of PUREarth's CWMF and CDT's Platinum
Plus FBC.  As previously announced, two earlier engine test programs conducted
at Southwest Research Institute (SwRI) have shown particulate reductions of 65
to 70 percent with hydrocarbons (HC) and carbon monoxide (CO) reductions of over
75 percent.  Reductions of greater than 50 percent reduction in particulate
matter can qualify as a level two verification under the California Air
Resources Board (CARB) Diesel Risk Reduction program targeting retrofit controls
to over 1.2 million engines.  Verification by EPA is also required for funding
under a number of state and federal retrofit programs.



During 2003 several FBC/CWMF systems were placed in commercial service on refuse
trucks in California and beverage delivery trucks in Texas using automatically
dosed FBC-treated fuel.  These applications represent the toughest conditions
for a filter due to low exhaust temperatures and higher soot emissions from
older, dirtier engines built in 1990-1993.  The FBC reduces engine-out soot by
15-25 percent and assists in further oxidizing soot that collects in the
specially catalyzed CWMF.  This prevents plugging of the filter with soot even
at low exhaust temperatures.



                                 MORE-MORE-MORE



CLEAN DIESEL COMPLETES RIGOROUS TESTING OF NEW DIESEL EMISSION CONTROL SYSTEM
JOINTLY DEVELOPED WITH MITSUI SUBSIDIARY

Page 2-2-2



Under a previously announced Memorandum of Understanding, initially PUREarth
will manufacture the CWMF devices in Japan and CDT will provide application
engineering and marketing in the US, as well as selling and distributing the
FBC.  CDT is also managing the CARB and EPA verification programs.  CDT and
PUREarth are continuing discussions with several potential marketing and
distribution partners in the US to address both the retrofit and new vehicle
market for diesel particulate reduction.  To begin with the FBC/CWMF system will
be targeted at school bus fleets, delivery vehicles and refuse trucks.



CDT previously verified its Platinum Plus Purifier (FBC/DOC) system for 40-50
percent particulate reduction in October 2003 under the ETV program, and the FBC
/CWMF system will extend the emission reduction to the next higher level of
performance at a lower cost than traditional heavily catalyzed filter systems.



Environmental Technology Verification Program is a registered trademark of the
US EPA.  More information on the Program can be found at www.epa.gov/etv/.



About Mitsui & Co., Ltd.

Mitsui & Co., Ltd. is one of world's largest and most diversified international
trading companies, with business extending from chemicals to steel and metals to
transportation machinery.  Its Inorganic Chemical Group, together with a unit of
Mitsui & Co.(USA), Inc., Mitsui's wholly-owned U.S. subsidiary headquartered in
New York City, is working with several industrial partners active in
engineering, fuels and heavy-duty vehicles to address diesel engine emissions in
Japan.  Mitsui has formed a wholly owned subsidiary, PUREarth to address diesel
particulate emissions and has a 50 percent ownership in Denox Inc. focused on
diesel NOx control.  Mitsui also holds the exclusive license on CDT's ARIS NOx
control technology for Japan.



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, the Platinum Plus Purifier System, 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, visit CDT at www.cdti.com or contact the Company directly.



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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