September 11, 2012 at 13:00 PM EDT
Clean Diesel Technologies, Inc.'s Innovative Low Precious Metal Catalysts Featured on North American Version of the All-New 2013 Accord
Honda to Begin Sales of New Accord on September 19, 2012

VENTURA, Calif., Sept. 11, 2012 (GLOBE NEWSWIRE) -- Clean Diesel Technologies, Inc. (Nasdaq:CDTI) ("CDTi" or the "Company"), a cleantech emissions control company, is pleased to announce that Honda will begin selling its all-new 2013 four- and six-cylinder Accord models incorporating the Company's latest catalyst offerings on September 19, 2012. CDTi is supplying Honda with a palladium-only ("Pd-only") catalyst that significantly reduces precious metal content and reduces the use of Rhodium by 50%.

In a press release issued by Honda Motor Co., Ltd., on September 6, titled, "Honda Develops New Catalyst to Significantly Reduce Use of Precious Metals - 50% Reduction in Use of Rhodium," Honda stated, "The adoption of this new catalyst will reduce overall use of precious metals by 22% (including a 50% reduction in rhodium) compared to the current model of Accord. Moreover, the development of the new catalyst has reduced the cost by 37% while complying with the California state standards in SULEV category of the LEV II regulation, which is one of the strictest emissions regulations in the world." The entire press release issued by Honda may be found at:

http://www.hondanews.info/news/en/auto/4120906aeng

CDTi's Catalyst Division began delivering catalysts to Honda in 2001 — offering a unique combination of high performance and low platinum group metal content, resulting in significant economic benefits. Since then, CDTi's catalysts have been sourced for new model programs that typically span four to five years, including the popular model years 2004 and 2008 Accord.

About CDTi

CDTi is a vertically integrated global manufacturer and distributor of emissions control systems and products, focused on the heavy duty diesel and light duty vehicle markets. CDTi utilizes its proprietary patented Mixed Phase Catalyst (MPC®) technology, as well as its ARIS® selective catalytic reduction, Platinum Plus® fuel-borne catalyst, and other technologies to provide high-value sustainable solutions to reduce emissions, increase energy efficiency and lower the carbon intensity of on- and off-road engine applications. CDTi is headquartered in Ventura, California and currently has operations in the U.S., Canada, U.K., France, Japan and Sweden. For more information, please visit www.cdti.com.

The Clean Diesel Technologies, Inc. logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=5742

Forward-Looking Statements Safe Harbor

Certain statements in this news release, such as statements regarding the potential for future model programs, the timing of new product programs and the time span of OEM model programs, 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 Clean Diesel's filings with the U.S. Securities and Exchange Commission, uncertainties and other factors that may cause the actual results, performance or achievements of Clean Diesel 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. Clean Diesel assumes no obligation to update the forward-looking information contained in this release.

CONTACT: Kristi Cushing
         Investor Relations Manager
         Tel: +1 (805) 639-9555
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