Clean Diesel Technologies Announces New European Licensing Opportunities

STAMFORD, Conn.--Sept. 21, 2005--Clean Diesel Technologies Inc. , a developer of chemical and technological solutions to reduce harmful engine emissions, today announced new European licensing opportunities for combination EGR (Exhaust Gas Recirculation) and SCR (Selective Catalytic Reduction) technology for NOx (Nitrogen Oxide) reduction, following a European patent grant. A similar U.S. patent has already been granted.

Clean Diesel Technologies will be showcasing this new technology as part of its suite of emissions control solutions at SAE International's Heavy Duty Diesel Emissions Control Symposium in Gothenburg, Sweden, from Sept. 20-22, 2005. This conference will focus on the latest emissions-control research and development, and examine how it affects the environmental impact of heavy-duty vehicles.

Clean Diesel Technologies views its EGR-SCR patent as fundamental for vehicle manufacturers and Tier 1 suppliers, and will make these intellectual property rights widely available for evaluation and development under research and commercial licenses. With 350,000 new heavy-duty vehicles on sale every year in Europe, truck and car manufacturers need to achieve high levels of NOx emission reductions to meet forthcoming Euro V and VI legislation. Clean Diesel's new license combining EGR and SCR is an attractive approach to meet upcoming legislation while also optimizing fuel economy. This intellectual property complements Clean Diesel's ARIS(R) SCR airless injection and control suite of technologies, which are also available for license for a wide range of applications. The ARIS technology encompasses robust designs for SCR systems, including its unique coverage of return flow, cooled urea injection for NOx control.

Dr. Bernhard Steiner, CEO of Clean Diesel, said: "This is a fundamental step forward for both Clean Diesel Technologies and the global market. Combining EGR with SCR broadens the duty range within which NOx reduction can be achieved, allowing for better fuel economy and reduced urea consumption associated with SCR. Regulators look towards global technologies such as this to gauge what levels of emission reduction are possible and to help set future performance targets - in turn driving forward the whole marketplace."

Clean Diesel is highlighting these technologies and more at the SAE International Gothenburg Symposium: http://www.sae.org/events/training/symposia/hddec/.

About Clean Diesel Technologies Inc.

Clean Diesel Technologies Inc. and its U.K. representative office, Clean Diesel International LLC, is a developer of chemical and technological solutions to reduce harmful engine emissions. Clean Diesel Technologies has patented products that reduce emissions from combustion engines while simultaneously improving fuel economy and power. Products include Platinum Plus(R) fuel-borne catalysts (FBC), 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.