CDTi Receives CARB Verification for Purifilter(R) EGR Product

CDTi Receives CARB Verification for Purifilter(R) EGR Product

                    Presents Additional Market Opportunity

                 Features CDTI's Breakthrough DPF Technology

VENTURA, Calif., Jan. 25, 2013 (GLOBE NEWSWIRE) -- Clean Diesel Technologies,
Inc. (Nasdaq:CDTI) ("CDTi"), a cleantech emissions control company, is pleased
to announce that it has received full verification from the California Air
Resources Board ("CARB") for its Purifilter® EGR emission reduction system.
Purifilter® EGR, which is also verified by the Environmental Protection Agency
("EPA"), features CDTI's patented breakthrough MPC® technology and is fully
compliant with CARB fleet rules.

Due to its unique design, Purifilter® EGR, a passively-regenerating diesel
particulate filter ("DPF"), provides exceptional filtration and regeneration
efficiency for the removal of particulate matter. The product addresses a
significant number of exhaust gas recirculation ("EGR") equipped heavy duty
trucks currently subject to the California Truck and Bus Regulation, which
requires diesel trucks and buses that operate in California to be upgraded to
reduce emissions by various deadlines.

"In November 2012, we received an Executive Order from CARB, which enabled us
to begin selling Purifilter® EGR to fleet operators pending final
verification. We are extremely pleased to announce that we have now received
the anticipated final verification from CARB," said Craig Breese, Chief
Executive Officer of CDTi. "Purifilter® EGR, one of our most advanced filter
solutions, is a key addition to our innovative portfolio of emission reduction
systems. With our extensive retrofit experience and large distributor network,
we are absolutely committed to addressing this larger market opportunity."

The CDTi logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=5742

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

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