STAMFORD, Conn., May 8, 2008 (PRIME NEWSWIRE) -- Clean Diesel Technologies, Inc. (NasdaqCM:CDTI - News) (XETRA:CDIA.DE - News) (AIM:CDT), the cleantech emissions reduction company, will announce its first quarter financial results on Tuesday, May 13 at 7:00 AM Eastern Time (12:00 BST & 13:00 CET).

The announcement will be followed by a conference call at 10:00 a.m. ET on Tuesday, May 13, 2008. The call will be available on the Company's website at http://www.cdti.com, or by calling: 877 407 8214 for U.S. callers, or +1 201 689 7832 for international callers. The conference call will be led by Dr. Bernhard Steiner, CEO and Ann Ruple, CFO of Clean Diesel Technologies, Inc.

A webcast will also be archived on the Company's website. Additionally, a telephone replay of the call will be available approximately one hour following the call through midnight Eastern Time on May 20, 2008, and can be accessed by calling: 877 660 6853 (U.S. callers) or +1 201 612 7415 (international callers) and entering account number 286 and conference ID 284833.

About Clean Diesel Technologies

Clean Diesel Technologies (NasdaqCM:CDTI - News) is a cleantech company providing sustainable solutions to reduce emissions, increase energy efficiency and lower the carbon intensity of on- and off-road engine applications. Clean Diesel's patented technologies and products allow manufacturers and operators to comply with increasingly strict regulatory emissions and air quality standards, while also improving fuel economy and power. The Company's solutions, which are in commercial use worldwide, significantly reduce emissions formed by the combustion of fossil fuels and biofuels, including particulate matter (PM), nitrogen oxides (NOx), carbon monoxide and hydrocarbons. Clean Diesel solutions also reduce carbon dioxide (CO2) emissions, a key greenhouse gas associated with global climate change.

Clean Diesel develops and manages intellectual property from original concept to full-scale commercial deployment. Its offerings include ARIS(r) Selective Catalytic Reduction (SCR); the patented combination of SCR and Exhaust Gas Recirculation; hydrocarbon injection for emissions control applications; Platinum Plus(r) Fuel-Borne Catalyst (FBC); the Purifier(tm) family of particulate filter systems; and its Wire Mesh Filter particulate filter technologies. The Company was founded in 1995 and is headquartered in Stamford, Connecticut. A wholly owned subsidiary, Clean Diesel International, LLC, is based in London, England. For more information, please visit http://www.cdti.com.

Please visit us on the World Wide Web at: http://www.cdti.com

          Crescendo Communications, LLC
          (U.S. investor contact)
          David K. Waldman 
          Klea Theoharis
          +1 212 671 1020
          cdti@crescendo-ir.com

          Clean Diesel Technologies, Inc.
          Ann Ruple, CFO
          +1 203 327 7050
          aruple@cdti.com

          Innovator Capital Limited
          (Financial press inquiries)
          Shaun Brown
          Jade Summer
            jade.summer@innovator-capital.com 
          +44 20 7297 6840

          Charles Stanley Securities
          Nominated Adviser
          Philip Davies
          Freddy Crossley
          +44 20 7149 6457

          Matter Communications
          (Technical press inquiries)
          Jacqueline Volovich
          +1 978-499-9250 x236
          jackie@matternow.com