VENTURA, Calif., May 31, 2012 /PRNewswire/ -- Clean Diesel Technologies, Inc. (NASDAQ:CDTI) ("Clean Diesel" or the "Company"), a cleantech emissions control company, is pleased to announce that it has received an expanded verification from the Environmental Protection Agency (EPA) for its innovative ECS-branded Purifilter® Plus diesel particulate filter (DPF) emission reduction system. Purifilter® Plus, featuring Clean Diesel's proprietary MPC® catalyst technology, is the only hybrid DPF system employing both passive and active regeneration that the EPA has verified for use in its engine retrofit programs. With this expanded verification, Purifilter® Plus is now approved for the retrofitting of a vast majority of 1994 to 2010 on-road vehicle exhaust gas recirculation (EGR) and non-EGR engines. These vehicles may include school, shuttle and urban buses, municipal, state and utility fleet vehicles, refuse trucks and urban delivery vehicles, all of which are candidates for the EPA's National Clean Diesel Campaign and State and Municipal programs aimed at lower emissions from the nation's aging diesel fleet. Additional Verifications Being Sought from CARB Clean Diesel offers the largest combined portfolio of EPA- and California Air Resources Board (CARB)-verified diesel retrofit solutions, with additional products currently in the evaluation process. These pending verifications include retrofit products pertaining to the current CARB Truck and Bus Regulation, a mandatory program established to meet federally imposed clean air standards and to reduce the adverse health effects from truck and bus pollution. The Company estimates the regulation will require over 100,000 heavy duty diesel trucks to be replaced or retrofitted by the CARB deadline of 2016, with the majority by 2014. The Company continues to work closely with CARB and believes that with the anticipated receipt of these verifications, the Company's extensive retrofit experience and its large distributor network, it will be well positioned to address the California opportunity. About Clean Diesel Technologies, Inc. Clean Diesel 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. Clean Diesel 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. Clean Diesel 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. Forward-Looking Statements Safe Harbor Certain statements in this news release, such as statements regarding future verifications and the size and scope of regulatory schemes and their impact on our business 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.