Clean Diesel Technologies, Inc. Reverse Stock Split.

STAMFORD, Conn. -- Clean Diesel Technologies, Inc. ("Clean Diesel" or the "Company") (OTC-BB: CDTI, AIM: CDT/CDTS & XETRA: CDI), an innovation leader for clean energy and environmental technologies to reduce harmful engine emissions, today announced that the reverse split (consolidation) of its common stock will be effective at 6:00 p.m. EDT on Friday, June 15, 2007. The reverse split was approved at the annual meeting of stockholders of Clean Diesel on June 7, 2007.

In the reverse split, five old shares of Clean Diesel common stock, par value $0.05 per share, will be exchanged for one new share, par value $0.01.

The new shares will have the CUSIP Number 18449C 302, and the ISIN Number US18449C3025 and will be designated SHS NEW COM. The restricted new common shares which may not be traded in the United States (the "Reg S" shares) will have the CUSIP Number U18247 111, and the ISIN Number USU182471115 and will be designated SHS NEW REG S.

The exchange agents for the reverse split will be American Stock Transfer and Trust Company in the United States and Capita IRG in the United Kingdom. Stockholders should not forward their stock certificates for exchange until after being contacted by the exchange agents.

Fractional shares of post-split Clean Diesel common stock will not be issued as a result of the reverse stock split. Instead, holders of pre-split shares of Clean Diesel common stock who otherwise would have been entitled to receive a fractional share as a result of the reverse stock split will receive an amount in cash equal to the value of the fractional shares on June 15, 2007 per post-split share for such fractional interests upon the surrender to American Stock Transfer and Trust Company or Capita IRG, the exchange agents, of stock certificates representing such shares or of shares held electronically. The value of fractional shares will be based upon the market price for the common stock.

The Company's objective in requesting stockholder approval of the reverse stock split was to facilitate its listing on a recognized U.S. stock exchange. After the reverse stock split, Clean Diesel Technologies will have approximately 6,447,668 shares issued and outstanding, outstanding reserves of 1,400,000 shares for warrants issued in December 2006, 1,215,521 shares for stock options and other warrants, and 2,936,811 shares of authorized common stock available for proper corporate purposes.

About Clean Diesel Technologies, Inc.

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 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.

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 US 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.