Clean Diesel Receives London Low Emission Zone (LEZ) Certification.

LEZ certification increases marketing potential to other major cities

STAMFORD, Conn. -- Clean Diesel Technologies, Inc. (NASD: CDTI; AIM: CDT/CDTS; XETRA: CDI), a global company providing innovative technologies and solutions that reduce emissions, conserve fuel and improve engine performance, announced today that it has received a London Low Emission Zone (LEZ) Certificate from Transport for London (TfL) for its Purifier Particulate Matter emission control technology (Purifier). TfL is responsible for the certification of Low Emission Certificate solutions for London's LEZ. The Company's Purifier met the technical standards of the accreditation agencies brought in by TfL to provide impartial oversight of the approval process. Clean Diesel also demonstrated that it had the technical and commercial capabilities to support the London LEZ program.

This Certification enables Clean Diesel to market Purifier as a retrofit solution to commercial operators owning older vehicles. Purifier will ensure those vehicles meet the regulatory standards required to enter the forthcoming London LEZ without having to replace their vehicles or pay the daily L200 charge for non-compliance. Clean Diesel has received initial orders for its LEZ solutions and appointed licensed installers throughout the UK to distribute and install Purifier.

Similar city-based LEZs are planned throughout Europe and Asia where it is recognized that the approval process for London will be one of the standards on which these other LEZs will be based.

Clean Diesel's range of Purifier solutions controls harmful emissions from diesel-powered engines through diesel particulate filtration and reduction systems, while also operating more cost-effectively. The benefits of the Purifier systems are directly transferable to other regions considering adoption of a LEZ as clean air and air quality continue to garner attention worldwide. The Purifier solutions will both improve the environment and be financially advantageous for fleet owners to implement.

Commenting on the certification, Bernhard Steiner, CEO and President of Clean Diesel said, "We are pleased with this opportunity; our LEZ solutions reduce particulate emissions by up to 95%. London will benefit from cleaner air, improved health and a significant reduction in environmental damage to its parks and buildings. This is a great endorsement for our technology and emissions reduction approach giving us an advantage in our marketing efforts to other major cities worldwide."

About Clean Diesel Technologies

Clean Diesel Technologies, Inc., together with its wholly-owned subsidiary, Clean Diesel International, LLC, is a clean energy and environmental technology company that provides innovative solutions to reduce harmful engine emissions and conserve energy. Clean Diesel Technologies' patented technologies, products and solutions enable cost-effective reduction of harmful emissions from internal combustion engines while also improving fuel economy and power. Products include Platinum Plus([R]) fuel-borne catalysts, the Platinum Plus Purifier[TM] Systems, the ARIS([R]) urea injection systems for selective catalytic reduction of NOx, diesel particulate filter and biofuels technologies. Their products are in commercial use around the world. Platinum Plus and ARIS are registered trademarks of Clean Diesel Technologies, Inc. For more information, visit Clean Diesel at www.cdti.com or contact the Company directly.

About the London Low Emissions Zone

On May 3, 2007, London Mayor Ken Livingstone made a commitment to introduce a low emission zone to improve the city's air quality. The LEZ is a specified area within which the most-polluting diesel-powered trucks, buses, taxis, large vans and minibuses will be required to meet specific Euro emissions targets or pay a substantial charge. Mayor Livingstone has since confirmed that virtually the entire Greater London region will become a LEZ in February 2008.

Air pollution affects the quality of life of a large number of Londoners, especially those with respiratory and cardiovascular conditions. It is estimated that in 2005 some 1,000 deaths and a similar number of hospital admissions occurred due to the city's poor air quality. The LEZ is considered to be the most effective way of quickly reducing pollutants that are among the most harmful to human health.