CDTi Receives EPA Verifications for Purifilter(R)EGR and Purifilter(R)OR

CDTi Receives EPA Verifications for Purifilter(R)EGR and Purifilter(R)OR

VENTURA, Calif., Dec. 19, 2013 (GLOBE NEWSWIRE) -- Clean Diesel Technologies,
Inc. (Nasdaq:CDTI) ("CDTi"), a leader in advanced emissions control solutions,
is pleased to announce that it has received two significant emission reduction
product verifications from the U.S. Environmental Protection Agency (the
"EPA") for use in heavy duty highway truck engines and off-road engines.

The uniquely designed Purifilter®EGR, featuring CDTi's proprietary MPC®
technology, is a passively-regenerating diesel particulate filter that
provides exceptional filtration and regeneration efficiency for the removal of
particulate matter. The EPA first verified Purifilter®EGR for 2002-2010 heavy
duty highway truck engines in November 2012. In October 2013, the EPA extended
the verification to cover all exhaust gas recirculation ("EGR") and non-EGR
heavy duty highway engines certified with particulate matter emissions at or
below 0.1 g/hp-hr manufactured between 1993 and 2010. This extension of the
Purifilter®EGR verification means that it can now be applied to the vast
majority of heavy duty highway engines sold over the past twenty years.

In December 2013, the EPA verified Purifilter®OR for Tier 1 thru Tier 3 (1996
to 2012) off-road engines with power ratings from 100 to 603hp and certified
with particulate matter emissions values of 0.2 g/hp-hr or less. The
Purifilter®OR is the off-road version of Purifilter®EGR. The EPA has recently
announced a $2 million funding for a 2013 construction equipment rebate
program. In addition, the EPA has announced the availability of $4 million in
DERA funding for clean diesel projects at ports. CDTi's Purifilter®EGR and
Purifilter®OR may now be employed by fleets under these EPA funded programs in
addition to CDTi's other EPA and Air Resources Board verified diesel emission
reduction products.

"With EPA verification granted, CDTi can assist highway and off-road fleet
managers to broadly retrofit their vehicles with passively regenerating diesel
particulate filters in order to reduce particulate matter emissions in excess
of 90%. With our extensive retrofit experience and large distributor network,
we are absolutely committed to addressing this larger market opportunity,"
said Ian MacDonald, Vice President, Sales & Marketing for CDTi.

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, France, Japan and Sweden. For more
information, please visit

Forward-Looking Statements Safe Harbor

Certain information contained in this press release constitutes
forward-looking statements. Any statements contained herein that are not
statements of historical fact should be considered forward-looking statements.
You can identify these forward-looking statements by the use of words such as
"believe(s)", "expect(s)", "anticipate(s)", "plan(s)", "may", "will", "would",
"intend(s)", "estimate(s)" or similar expressions, as well as other words or
expressions referencing future events, conditions or circumstances, whether in
the negative or affirmative. Examples of forward-looking statements contained
in this press release include, among others, statements regarding potential
uses for CDTi's Purifilter®EGR, the availability of EPA-announced funding, the
use of CDTI's Purifilter®EGR and Purifilter®OR by fleets under EPA-funded
programs, the anticipated benefits of receiving EPA verification, and CDTi's
plans with respect to addressing market opportunities. Forward-looking
statements are based on a series of expectations, assumptions, estimates and
projections which involve substantial uncertainty and risk. In general, actual
results may differ materially from those indicated by such forward-looking
statements as a result of risks and uncertainties, including, but not limited
to, the potential future unavailability of government funding, unforeseen
difficulties in applying Purifilter®EGR or Purifilter®OR to heavy duty highway
engines or fleets under EPA funded programs, unforeseen difficulties in
achieving sales despite the potential applicability of CDTi's products, and
other risks and uncertainties discussed or referenced in CDTi's Annual Report
on Form 10-K filed on March 27, 2013 and other filings with the Securities and
Exchange Commission. In addition, any forward-looking statements represent
CDTi's estimates only as of the date such statements and should not be relied
upon as representing CDTi's estimates as of any subsequent date. CDTi
specifically disclaims any obligation to update forward-looking statements.
All forward-looking statements in this press release are qualified in their
entirety by this cautionary statement.

CONTACT: Kevin M. McGrath
         Cameron Associates, Inc.
         Tel:  +1 (212) 245-4577

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