<PAGE>
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

(Mark One)

[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934
         For the quarterly period ended September 30, 1999

                                       or

[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934 For the transition period from ______ to ______

         Commission file number:      0-27432


                         CLEAN DIESEL TECHNOLOGIES, INC.
             (Exact name of registrant as specified in its charter)

         Delaware                                       06-1393453
 ------------------------                   ------------------------------------
 (State of Incorporation)                   (I.R.S. Employer Identification No.)

Clean Diesel Technologies, Inc.
300 Atlantic Street - Suite 702
Stamford, CT                                        06901-3522
(Address of principal executive offices)            (Zip Code)

                                 (203) 327-7050
              (Registrant's telephone number, including area code)


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months and (2) has been subject to such filing requirements for
the past 90 days.


                                    Yes X   No
                                       ---    ---

As of November 12, 1999, there were outstanding 2,594,456 shares of Common
Stock, par value $0.05 per share, of the registrant.


================================================================================


<PAGE>







                         CLEAN DIESEL TECHNOLOGIES, INC.
                          (A Development Stage Company)
               Form 10-Q for the Quarter Ended September 30, 1999

                                      INDEX
                                                                      Page

PART I.           FINANCIAL INFORMATION

Item 1.           Financial Statements (Unaudited)

                  Balance Sheets as of September 30, 1999,               1
                  and December 31, 1998

                  Statements of Operations for the Three and             2
                  Nine Month Periods Ended September 30, 1999, and
                  1998, and for the Period from January 1, 1992,
                  through September 30, 1999

                  Statements of Cash Flows for the Nine Month            3
                  Periods Ended September 30, 1999, and 1998,
                  and for the Period from January 1, 1992,
                  through September 30, 1999

                  Note to Financial Statements                           4

Item 2.           Management's Discussion and Analysis of                9
                  Financial Condition and Results of Operations


PART II.          OTHER INFORMATION

Item 1.           Legal Proceedings                                     15
Item 2.           Changes in Securities                                 15
Item 3.           Defaults upon Senior Securities                       15
Item 4.           Submission of Matters to a Vote of Security Holders   15
Item 5.           Other Information                                     15
Item 6.           Exhibits and Reports on Form 8-K                      15


SIGNATURES                                                              16



<PAGE>


PART I.      FINANCIAL INFORMATION
Item 1.      Financial Statements



                         CLEAN DIESEL TECHNOLOGIES, INC.
                          (A Development Stage Company)
                                 BALANCE SHEETS
<TABLE>
<CAPTION>


                                                            (in thousands except share data)

                                                             September 30,        December 31,
                                                                 1999                 1998
                                                             -------------        ------------
                                                              (Unaudited)
<S>                                                                 <C>                   <C>
Assets
Current assets:
Cash and cash equivalents                                   $         1,519      $         1,663
Inventories                                                             246                  219
Other current assets                                                     80                   58
                                                            ---------------      ---------------

Total current assets                                                  1,845                1,940

Other assets                                                             35                   45
                                                            ---------------      ---------------

Total assets                                                $         1,880      $         1,985
                                                            ===============      ===============


Liabilities and stockholders' equity
Current Liabilities:

Accounts payable and accrued expenses                       $           575      $           686
                                                            ---------------      ---------------

Stockholders' equity:
Preferred Stock, par value $0.05 per share,
   authorized 85,000 shares, no shares issued
   and outstanding                                                       --                   --

Series A Convertible Preferred Stock, par value
   $0.05 per share, $500 per share liquidation
   preference, authorized 15,000 and 10,000
   shares, issued and outstanding 11,082 and 7,582
   shares, involuntary liquidation value
   $5,934,000 and $3,840,000                                              1                    1
Common Stock, par value $0.05 per share,
   authorized 15,000,000 shares, issued and
   outstanding 2,592,790 and 2,544,443 shares                           130                  127
Additional paid-in capital                                           18,808               15,008
Deficit accumulated during development stage                        (17,634)             (13,837)
                                                            ----------------     ----------------

Total stockholders' equity                                            1,305                1,299
                                                            ---------------      ---------------

Total liabilities and stockholders' equity                  $         1,880      $         1,985
                                                            ===============      ===============
</TABLE>


See note to financial statements.


                                       -1-
<PAGE>



                         CLEAN DIESEL TECHNOLOGIES, INC.
                          (A Development Stage Company)
                            STATEMENTS OF OPERATIONS
                                   (Unaudited)
<TABLE>
<CAPTION>
                                                                      (in thousands except per share data)

                                                                                                                 Period from
                                                Three Months Ended              Nine Months Ended             January 1, 1992,
                                                  September 30,                   September 30,                    through
                                               1999            1998            1999             1998          September 30, 1999
                                              -------        -------         --------        ---------        ------------------
<S>                                            <C>           <C>               <C>            <C>                  <C>
Sales                                          $    41       $    30           $   100        $    39              $  345

Costs and expenses:
Cost of sales                                       19            19                57             24                 218
General and administrative                         372           366             1,124          1,121               7,681
Research and development                           197           269               649            684               6,975
Patent filing and maintenance                       32            39                84            119               1,178
                                               -------       -------           -------        -------            --------

Loss from operations                               579           663             1,814          1,909              15,707
Interest income                                    (9)           (9)              (31)           (30)               (653)
Interest expense                                     1            44                 2             76                 304
Cost of withdrawn Rights Offering                   --           247                --            247                 264
                                               -------       -------           -------        -------            --------
Net loss                                           571           945             1,785          2,202              15,622
One-time imputed non-cash
   perferred dividend                            1,750            --             1,750             --               1,750
Preferred Stock dividend                           108            --               262             --                 262
                                               -------       -------           -------        -------            --------
Net loss attributable to
   Common Stockholders                         $ 2,429       $   945           $ 3,797        $ 2,202            $ 17,634
                                               =======       =======           =======        =======            ========


Basic and diluted loss per
   Common Share                                $  0.94       $  0.38           $  1.48        $  0.87                 N/A
                                               =======       =======           =======        =======            ========


Average number of Common
   Shares outstanding                            2,592         2,517             2,574          2,517                 N/A
                                               =======       =======           =======        =======            ========
</TABLE>



See note to financial statements.


                                       -2-

<PAGE>





                         CLEAN DIESEL TECHNOLOGIES, INC.
                          (A Development Stage Company)
                            STATEMENTS OF CASH FLOWS
                                   (Unaudited)
<TABLE>
<CAPTION>


                                                                       (in thousands)

                                                                                        Period from
                                                        Nine Months Ended           January 1, 1992,
                                                           September 30,                 through
                                                         1999          1998        September 30, 1999
                                                      ---------      ---------     --------------------
<S>                                                       <C>             <C>                 <C>

Operating activities
Net cash used in operating activities                $ (1,861)       $ (2,180)        $  (15,200)
                                                     ---------       ---------        -----------
Financing activities
Proceeds from 1995 Rights Offering, net
   of $630 of brokerage commissions                         --              --             11,156
Expenses of 1995 Rights Offering                            --              --               (425)
Repayment of expenses of 1995 Rights
   Offering paid by Fuel-Tech N.V.                          --              --               (200)
Issuance of common stock to parent                          --              --                250
Net parent company investment                               --              --                469
Proceeds of loan from Fuel-Tech N.V.                        --              --              2,874
Repayment of loan to Fuel-Tech N.V.                         --              --             (2,313)
Proceeds from exercise of stock options                      2              --                  6
Proceeds from bridge loan                                   --           1,400              1,400
Proceeds from issuance of preferred stock                1,721              --              3,597
                                                     ---------       ---------        -----------
Net cash provided from financing activities              1,723           1,400             16,814
                                                     ---------       ---------        -----------

Investing activities
Purchase of fixed assets                                    (6)             (2)               (95)
                                                     ---------       ---------        -----------
Net cash used in investing activities                       (6)             (2)               (95)
                                                     ---------       ---------        -----------
Net (decrease) increase in cash
   and cash equivalents                                   (144)           (782)             1,519
Cash and cash equivalents at beginning
   of period                                             1,663           1,239                 --
                                                     ---------       ---------        -----------

Cash and cash equivalents at
   end of period                                     $   1,519       $     457        $     1,519
                                                     =========       =========        ===========

</TABLE>


See note to financial statements.

                                       -3-

<PAGE>






                         CLEAN DIESEL TECHNOLOGIES, INC.
                          (A Development Stage Company)
                          NOTE TO FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1999
                                   (Unaudited)



Basis of Presentation

       The accompanying unaudited condensed financial statements have been
prepared in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Rule 10-01 of
Regulation S-X. Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles for complete
financial statements. In the opinion of management, all adjustments considered
necessary for a fair presentation have been included. All such adjustments are
of a normal recurring nature. Operating results for the three and nine month
periods ended September 30, 1999, are not necessarily indicative of the results
that may be expected for the year ending December 31, 1999. For further
information, refer to the financial statements and footnotes thereto included in
the Company's Form 10-K for the year ended December 31, 1998.

       The balance sheet at December 31, 1998, has been derived from the audited
financial statements at that date but does not include all of the information
and footnotes required by generally accepted accounting principles for complete
financial statements.

       Clean Diesel Technologies, Inc. (the "Company") was incorporated in the
State of Delaware on January 19, 1994, as a wholly owned subsidiary of Fuel-Tech
N.V. ("Fuel Tech"). Effective December 12, 1995, Fuel Tech completed a Rights
Offering of the Company's Common Stock, and reduced its ownership in the Company
to 27.6%.

       The Company is a development stage enterprise, and its efforts from
January 1, 1992, through September 30, 1999, have been devoted to the research,
development and commercialization of its products. Its products include advanced
catalytic fuel additives and systems that reduce harmful emissions from internal
combustion engines while improving fuel economy in diesel- and gasoline-fueled
engines. They also include nitrogen oxide ("NOx") reduction systems and
chemicals for the control of NOx emissions from diesel engines.

       During 1998, the Company began a shift in emphasis from research and
development toward commercialization of its technologies. In late 1998 and the
first nine months of 1999, the Company shipped pre-production commercial units
of its Advanced Reagent Injection System, the ARIS(TM) 2000, to several engine
manufacturers, catalyst companies, and industrial end-users. The Company also
began several commercial field trials of its Platinum Plus(R) diesel fuel
catalyst to determine fuel economy. Further commercialization of the Company's
technologies will depend upon the success of field tests and governmental
regulations, principally by the US Environmental Protection Agency and
corresponding foreign and state agencies.

       In December 1997, the Company identified a need to raise an additional $5
million to aid in its commercialization efforts. In 1998, the Company received
net proceeds of approximately $3.2 million through private placements of its
Series A Convertible Preferred Stock (the "Preferred Stock"). In
August/September 1999, the Company received the remainder of the $5 million, or
approximately $1.7 million of net proceeds, from private European investors
against the further issuance of 3,500 shares of the Preferred Stock.


                                      -4-
<PAGE>

       At December 31, 1998, the Company had 7,582 shares of Preferred Stock
outstanding. As more fully described in "Series A Convertible Preferred Stock"
below, the Preferred Stock carries, by resolution of the Board of Directors of
the Company, either an annual dividend of 9% payable in cash or 11% payable in
kind. The Directors have resolved that until further notice such dividend will
be paid in kind. At September 30, 1999, as a result of the 1999 quarterly
in-kind dividends and the $1.75 million stock purchase in the third quarter of
1999, the Company had 11,082 shares of Preferred Stock issued and outstanding
with an additional 515 shares pertaining to declared dividends issuable upon
demand. On a fully converted basis at September 30, 1999, Fuel Tech would retain
an approximate 21.9% interest in the Company. See "Going Concern" and "Series A
Convertible Preferred Stock" below for additional information.

Going Concern

       The financial statements have been prepared assuming that the Company
will continue as a going concern and do not include any adjustments to reflect
the possible future effects on the recoverability and classification of assets
and the amount and classification of liabilities that may result from the
possible inability of the Company to continue as a going concern.

       Commercial field trials of the Company's Platinum Plus diesel fuel
catalyst have begun. The Company has delivered orders for its entire
pre-production schedule and has also received commercial orders for its ARIS
2000 diesel NOx reduction system.

       During this period of field trials, product evaluations and development,
the Company has had recurring operating losses and has been unable to generate a
positive cash flow. In management's opinion, the funding secured in the third
quarter of 1999, along with its existing cash balances, will be sufficient to
fund the Company's operations until June 2000. In June 1999, the Company
announced plans to license its NOx reduction business, which has started to
generate commercial sales. As more fully described below, in November 1999, the
Company entered into a letter of intent to license its patented ARIS stationary
diesel technology for a $1 million payment plus an on-going royalty. This
agreement is expected to be consummated on January 15, 2000, upon the successful
completion of due diligence. If the Company is successful in licensing this
business, the Company's management believes that it will have sufficient cash
balances to finance its operations into the first quarter of 2001. If the
Company is unable to license its NOx reduction business and/or realize
commercial sales of its Platinum Plus additives or ARIS 2000 systems, the
Company will require additional capital to fund its operations beyond June 2000.
Although the Company believes that it will be successful in its capital-raising
efforts, should they be necessary, there is no guarantee that it will be able to
raise such funds on terms that will be satisfactory to the Company. The Company
will develop contingency plans in the event future financing efforts, if
required, are not successful. Such plans may include reducing expenses and
selling or licensing some of the Company's technologies. Accordingly, at
September 30, 1999, there is substantial doubt as to the Company's ability to
continue as a going concern. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Liquidity and Sources of
Capital" elsewhere herein for additional information.

Inventories

       Inventories are stated at the lower of cost or market and consist of
finished products. Cost is determined using the first-in, first-out (FIFO)
method.

Series A Convertible Preferred Stock

       During 1998, the Company received $1.4 million, exclusive of $45,000 of
commissions and expenses, through a Bridge Loan. In November 1998, the Company
received an additional $1.85 million in net proceeds through a private placement
of 3,753 shares of its Preferred Stock. As the net proceeds exceeded the $1.75
million minimum stipulated in the terms of the Bridge Loan, the loan
automatically converted into 2,800 shares of Preferred Stock. Concurrently, in
November 1998, Fuel Tech elected to convert its $495,000 Term Note due from the
Company, as well as $20,000 of associated accrued interest from the Bridge Loan
and Term Note, into 1,029 shares of the Preferred Stock. In August/September
1999, the Company received proceeds of $1.75 million, exclusive of $29,000 of
commissions and expenses, from private investors against the issuance of an
additional 3,500 shares of Preferred Stock.


                                      -5-
<PAGE>

       Additionally, on June 14, 1999, in connection with and subject to
completion of the 1999 funding, the Company agreed to grant warrants to Mr.
Derek Gray and Mr. John de Havilland, directors of the Company, for the purchase
of 58,333 and 29,167 shares of the Company's Common Stock, respectively, at the
exercise price of $1.50 per share, which exceeded the market value of the
Company's stock at such date. The warrants have a term of ten years.

       The Preferred Stock has a stated value and liquidation preference of $500
per share plus accrued and unpaid dividends. Holders of the Preferred Stock are
entitled to receive, when and if declared by the Board of Directors of the
Company out of funds of the Company legally available therefor, cash dividends
at the annual rate of 9% or dividends in kind at the annual rate of 11%. Cash
dividends and dividends in kind are each deemed "Preferred Dividends". Preferred
Dividends are payable quarterly in arrears.

       In order to conserve cash, on February 4, 1999, the Company's Board of
Directors adopted a resolution that all dividends declared on the Preferred
Stock be payable in kind at the annual rate of 11%. The dividends will be paid
in the form of additional shares of Preferred Stock in accordance with the terms
and conditions of the Certificate of Designation on the first business day of
January, April, July, and October to stockholders of record on the first
business day of the prior December, March, June, and September. Dividends in
kind are evidenced by a stock certificate for full share amounts of such
dividends, with fractional amounts accruing and paid in full shares on a
subsequent dividend. The directors further resolved to issue certificates for
stock dividends annually rather than quarterly, unless a stockholder requests
certificates to be issued more frequently. These resolutions will remain in
effect until revoked by the Company's Board of Directors.

       During 1999, stock dividends which were payable on January 1, April 1,
and July 1 were paid in-kind as 88, 210, and 217 additional shares of the
Preferred Stock, respectively. At September 30, 1999, the Company had 11,082
shares of Preferred Stock issued and outstanding with another 515 shares
issuable upon demand. Additionally, at September 30, 1999, the Company had
earned but undeclared dividends of approximately $130,000.

       Each share of the Preferred Stock is convertible into 333.33 shares of
the Company's Common Stock, which is equivalent to $1.50 per Common Share.
Assuming full conversion of the Preferred Stock, at September 30, 1999, the
Company would have approximately 6.5 million shares of Common Stock outstanding,
of which Fuel Tech would own approximately 1.4 million shares, or a 21.9%
interest in the Company.

       The Company can force the holder of Preferred Stock to convert its
shares, in whole or in part, into Common Stock at any time on, or after, the
date that the average Closing Price (as defined in the Certificate of
Designation) of the Common Stock equals or exceeds $4.50 for 20 consecutive
trading days. Such conversion may, at the election of the holders of 60% of the
issued and outstanding shares of the Preferred Stock, be scheduled to occur on a
pro-rata basis quarterly over 18 months. The Preferred Stock shall be
automatically converted into Common Stock should the Company consummate a public
offering of its Common Stock in excess of certain prescribed amounts. In the
event of such mandatory conversion, accrued and unpaid dividends will also
convert into Common Stock, on the same terms as the underlying shares of
Preferred Stock.

       Pursuant to a Registration Rights Agreement and Consent, these Common
Shares will be entitled to registrations under the Securities Act of 1933, as
amended, (a) three on demand, if not less than $500,000 in value and not more
often than once in every twelve months, and (b) an unlimited number, if
incidental or "piggy-back."

       Effective February 10, 1999, Section 3(a) of the Certificate of
Designation (the "Certificate") of the Preferred Stock was revoked by the filing
of a Certificate of Amendment with the Secretary of the State of Delaware. The
effect of this resolution was to eliminate the requirement in Section 3(a) of
the Certificate that the Preferred Stock be subject to redemption at the option
of a stockholder on or after May 8, 2002. The revocation had previously been
approved by the holders of the Preferred Stock.


                                      -6-
<PAGE>

Loss per Common Share

       As previously discussed, during the third quarter of 1999 the Company
issued 3,500 shares of Preferred Stock in exchange for $1.75 million with each
share being immediately convertible into 333.33 shares of the Company's Common
Stock. The Company was actively marketing its Preferred Stock at a premium
(i.e., the $1.50 conversion price was above the market price at the time of the
solicitation) and did in fact receive commitments from European investors at a
time when the stock price was below $1.50 per share. Subsequent to receiving the
commitments but prior to receiving the funds, the price of the Company's stock
increased to over $3 per share. In connection therewith, as required by the
Financial Accounting Standards Board's Emerging Issues Task Force Statement 98-5
"Accounting for Convertible Securities with Beneficial Conversion Features or
Contingently Adjustable Conversion Ratios," the Company is required to record a
one-time imputed non-cash dividend of approximately $1.75 million resulting from
the difference between the conversion price and the quoted market price of the
Company's Common Stock as of the date of issuance. The $1.75 million
one-time imputed non-cash dividend has been recognized in the computation of a
loss applicable to common stockholders as a charge against the accumulated
deficit with a corresponding increase in additional paid-in capital. There is no
related dividend distribution to Series A preferred stockholders. The
potentially dilutive Preferred Stock securities were not included in the diluted
loss per share applicable to common stockholders as the effect would be
anti-dilutive.

Related Party Transactions

       The Company entered into a Management and Services Agreement with Fuel
Tech. Under the agreement, the Company agreed to pay Fuel Tech a fee equal to an
additional 3% - 10% of the costs paid on the Company's behalf, dependent upon
the nature of the costs incurred. Currently, a fee of 3% is assessed on all
costs billed to the Company. Charges to the Company, inclusive of the
administrative fee, were approximately $26,000 and $36,000 in the third quarter
of 1999 and 1998, respectively.

Commitments

       In January 1999, the Company agreed to an extension of its sublease. The
annual fixed rent amount under the sublease extension, which runs from March 1,
1999, through February 28, 2002 (unless terminated sooner pursuant to the terms
of the agreement), is $81,200.

       Effective October 28, 1994, Fuel Tech granted two licenses to the Company
for all patents and rights associated with its Platinum Fuel Catalyst ("PFC")
technology. Effective November 24, 1997, the licenses were canceled and Fuel
Tech assigned to the Company all such patents and rights on terms substantially
similar to the licenses. In exchange for the assignment, the Company will pay
Fuel Tech a royalty of 2.5% of its annual gross revenue from sales of the PFCs
commencing in 1998. The royalty obligation expires in 2008. The Company may
terminate the royalty obligation to Fuel Tech by payment of $10,909,091 in 1999
and declining annually to $1,090,910 in 2008. The Company as assignee and owner
will maintain the technology at its own expense. To date no royalties have been
paid to Fuel Tech.

Subsequent Event

       On November 16, 1999, the Company entered into a letter of intent with
RJM, Inc. ("RJM") to license the Company's patented ARIS stationary diesel NOx
reduction technology for a $1 million payment and an on-going royalty. The
royalty applies to all future ARIS system sales for stationary diesel, railroad
and marine engines in North, South and Central America. The Company will retain
its  license rights to the ARIS technology for the stationary diesel
applications in the rest of the world and all ARIS technology rights for mobile
engines (other than marine and railroad in the territory mentioned above). The
agreement is expected to be consummated on January 15, 2000, and is subject to
successful completion of due diligence by RJM.


                                      -7-
<PAGE>


       Assuming completion and implementation of the RJM license agreement on
January 15, 2000, and the associated reduction in operating expenses related to
the ARIS stationary diesel technology, the Company expects to have sufficient
funds to sustain current operations into the first quarter of 2001. This assumes
a worst case scenario of no significant sales of Platinum Plus additives or
other revenues from additional licenses or royalties. As described elsewhere
herein, the Company expects commercial sales of Platinum Plus to begin in early
2000.


                                      -8-

<PAGE>


                         CLEAN DIESEL TECHNOLOGIES, INC.



Item 2.    Management's Discussion and Analysis of Financial Condition
           and Results of Operations


Forward-Looking Statements

       Statements in this Form 10-Q that are not historical facts, so-called
"forward-looking statements," are made pursuant to the safe harbor provisions of
the Private Securities Litigation Reform Act of 1995. Investors are cautioned
that all forward-looking statements involve risks and uncertainties, including
those detailed in the Company's filings with the Securities and Exchange
Commission. See "Risk Factors of the Business" in Item 1, "Business," and also
Item 7, "Management's Discussion and Analysis of Financial Condition and Results
of Operations" in the Company's Form 10-K for the year ended December 31, 1998.

Results of Operations

       Sales for the third quarter and first nine months of 1999 increased to
$41,000 and $100,000, respectively, from $30,000 and $39,000 in each of the
comparable periods in 1998. Cost of Sales remained flat at $19,000 in the third
quarter of 1999 and 1998, respectively. Cost of Sales increased to $57,000 in
the first nine months of 1999 from $24,000 in the respective comparable period
in 1998.

       The 1999 and 1998 revenues related primarily to sales of pre-production
commercial units of the Company's Advanced Reagent Injection System, the
ARIS(TM) 2000, to several engine manufacturers', catalyst companies, and
industrial end-users.

       In 1998, the Company had minimal sales of its platinum-cerium bimetallic
additive. In 1999, the Company recorded its first commercial sales of its
Platinum Plus(R) additives for use with particulate filters. The sales were for
field trials to customers in Korea and Taiwan and for a stationary diesel
application in the US. The Company believes its platinum-cerium additive has
demonstrated better trap regeneration performance than other additive systems
and has the benefit of being effective at much lower dose rates than other
competitive additives using cerium or iron alone. Dose rates are important
because they result in lower ash buildup and longer filter life.

       The Company's platinum-cerium bimetallic additive with diesel flow
through oxidizers has also proven in testing to be effective in reducing the
"carbon fraction" of diesel particulate emissions, whereas oxidizers alone are
effective only on the soluble organic fraction from oil and fuel residues. Many
engine manufacturers plan to meet the new nitrogen oxide ("NOx") limits by means
of Exhaust Gas Recirculation ("EGR"), which has the disadvantage of increasing
particulates and especially the "carbon fraction" content.

       The Company is completing its Tier 1 registration of the platinum-cerium
additive and already has effective registration of its platinum-only additives.
Field trials of the platinum-cerium additive started in the first quarter of
1999 and are continuing. Based on trials that were completed in the first half
of 1999, the Company expects commercial sales to start in late 1999 or the first
half of 2000.

       The US EPA and Engine Manufacturers Settlement of October 1998 mandates
the expenditure by engine companies of $109.5 million in projects to reduce NOx
emissions, including research and development to design low-emitting engines and
new emission control technologies. The Company has prepared a demonstration
program of its ARIS 2000 system. The Company has submitted proposals to the US
EPA and engine companies for four projects totaling approximately $6 million,
two of which pertain to the ARIS system and two to the Company's bimetallic fuel
additive.


                                      -9-
<PAGE>


       The Company identified a market opportunity for urea selective catalytic
reduction (SCR) systems for use with stationary diesel engines primarily for
power generation. The ARIS 2000 is a single fluid injection and metering system
complete with an electronic control unit that can be integrated with engine
electronic and diagnostic systems. The Company has completed development of the
ARIS 2000 system for stationary diesel engines and sold initial units to major
engine manufacturers for evaluation purposes in late 1998. It has since sold and
installed the first commercial ARIS systems.

       The Company believes that the ARIS 2000 NOx reduction system has
applications for both stationary engines and mobile engines. While the ARIS 2000
for stationary use has completed development and is now being sold commercially,
the ARIS system for mobile applications needs further development from the
present prototype stage. The Company believes that the ARIS 2000 system can most
effectively be commercialized through licensing a company or companies with a
related business in these markets. The Company has been actively seeking to
license this technology and on November 16, 1999, entered into a letter of
intent with RJM, Inc. ("RJM") to license its patented ARIS stationary diesel
technology. The pending license agreement is for stationary diesel, railroad and
marine engines in North, Central and South America. See "Note to Financial
Statement -- Subsequent Event" above.

       The Company expects commercial revenues from sales of its Platinum Plus
additives to start in late 1999 or the first half of 2000, initially from sales
to fleets and aftermarket products and later to engine manufacturers for
inclusion with an "onboard dosing" system on new vehicles. The Company also
expects revenues from demonstration programs and joint development agreements
for its Platinum Plus additives, but will not know whether its programs are
accepted until late in 1999 or early 2000.

       General and administrative expenses increased slightly to $372,000 and
$1,124,0000 in the third quarter and first nine months of 1999, respectively,
from $366,000 and $1,121,000 in the comparable periods in 1998. Although General
and Administrative expenses remained relatively flat, marketing and travel
expenses associated with the Company's efforts to commercialize its products
increased significantly in 1999. These increased expenses, however, are offset
by 1998 expenditures by the Company associated with its efforts to obtain
financing in 1998.

       Research and development expenses decreased to $197,000 in the third
quarter of 1999 from $269,000 in the comparable period in 1998. Research and
development expenses decreased in the first nine months of 1999 to $649,000 from
$684,000 in the comparable period in 1998. The decrease in expenditures is the
result of the Company's shift in emphasis away from research and development and
toward actual commercialization of its products, as more fully discussed above.

       Patent filing and maintenance expenses remained relatively flat,
decreasing to $32,000 in the third quarter of 1999 from $39,000 in the
comparable period in 1998. Patent costs decreased to $84,000 in the first nine
months of 1999 from $119,000 in the comparable period in 1998. The decrease is
again due in part to the shift in emphasis toward commercialization, as noted
above.

       Interest income remained relatively flat at $9,000 for both the third
quarter of 1999 and the comparable year earlier period, and increasing to
$31,000 in the first nine months of 1999 from $30,000 in the comparable period
in 1998. Interest expense decreased to $1,000 and $2,000 in the third quarter
and first nine months of 1999, respectively, from $44,000 and $76,000 in the
comparable periods in 1998, respectively, due to the conversion of the Company's
outstanding debt into shares of the Company's Preferred Stock in November 1998.
See "Note to Financial Statements -- Series A Convertible Preferred Stock" above
and "Liquidity and Sources of Capital" below for further information.

                                      -10-
<PAGE>

Liquidity and Sources of Capital

       The Company is a development stage enterprise and has incurred losses
since inception (January 1, 1992 through September 30, 1999) aggregating
$15,622,000 (excluding the effect of the dividends on the Preferred Stock) and
$13,837,000 at December 31, 1998. The Company expects to incur losses through
the foreseeable future as it further pursues its research, development, and
commercialization efforts. Although the Company started selling product in 1997,
sales to date have been minimal and the Company continues to be dependent upon
sources other than operations to finance its working capital requirements.

       In December 1995, the Company raised approximately $10.5 million, net of
offering expenses and broker-dealer commissions of approximately $1.3 million,
through the 1995 Rights Offering of its shares by Fuel Tech. The Company then
repaid Fuel Tech approximately $2.3 million in intercompany loans.

       On February 17, 1998, Fuel Tech agreed to provide the Company with up to
$500,000 in order to fund its cash requirements until such time as the Company
obtained the long-term financing it was seeking. On May 20, 1998, the $500,000
commitment was converted into a bridge loan (the "Bridge Loan"). The Bridge Loan
stipulated an automatic conversion into shares of Preferred Stock upon the
conclusion of a public or private financing that contributed a minimum of $1.75
million of additional net proceeds to the Company. In mid-1998, the Company also
received an additional $900,000 of financing under the same Bridge Loan (having
the same terms and conditions) from outside investors. As more fully described
below, in November 1998, the Bridge Loan automatically converted into 2,800
shares of Preferred Stock.

       In 1997, the Company repaid $250,000 of a $745,000 promissory demand note
with Fuel Tech and restructured the remaining amount into a $495,000 promissory
note (the "Term Note") with Platinum Plus, Inc. ("Platinum Plus"), a wholly
owned subsidiary of Fuel Tech. The principal amount of the Term Note was payable
in three annual installments of $100,000 each on July 1 of each of the years
1998 through 2000, with a final installment of $195,000 due on July 1, 2001. On
July 1, 1998, Platinum Plus elected to defer the repayment of the $100,000 of
principal, which was payable on that date. Interest at a rate of 8% per annum
was payable on the unpaid balance on each principal payment date. The interest
accrued on the note as of July 1, 1998, was paid by the Company. See below for
further information concerning the exchange of the Term Note for shares of the
Company's Preferred Stock.

       In November 1998, the Company obtained approximately $1.85 million in net
proceeds against the issuance of 3,753 shares of Preferred Stock through a
private placement. As the Company received net proceeds in excess of the $1.75
million minimum, and in accordance with the terms of the Bridge Loan agreement,
the $1.4 million Bridge Loan, mentioned above, converted into 2,800 shares of
Preferred Stock. Additionally, in an effort to retain its approximate 27%
interest in the Company (assuming conversion of the Preferred Stock into the
Company's Common Shares), Fuel Tech elected to exchange its $495,000 Term Note,
and $20,000 of associated accrued interest from its Bridge Loan and Term Note,
for 1,029 shares of Preferred Stock. As a result, Fuel Tech owned 2,029 shares
of the Company's Preferred Stock at December 31, 1998. These shares plus the
1999 quarterly dividends, if converted, along with its Common Stock ownership
would give Fuel Tech an approximate 21.9% interest in the Company on a fully
converted basis at September 30, 1999.

       In August/September 1999, the Company received gross proceeds of $1.75
million, excluding expenses of $29,000, from private investors against the
issuance of an additional 3,500 shares of Preferred Stock. As a result, the
Company had 11,082 and 7,582 shares of Preferred Stock issued and outstanding at
September 30, 1999, and at December 31, 1998, respectively. As a result of the
1999 quarterly dividends, the Company had an additional 515 shares of Preferred
Stock issuable upon demand. Therefore, at September 30, 1999, the Company had a
total of 11,597 issuable shares of Preferred Stock which are convertible into
approximately 3.9 million shares of the Company's Common Stock, $0.05 par
(convertible at a rate of 1:333.33).


                                      -11-
<PAGE>
       In November 1999, the Company entered into a letter of intent with RJM to
license its patented ARIS stationary diesel NOx reduction technology for a $1
million payment and an on-going royalty. See "Note to Financial Statements --
Subsequent Event" for further information.

       Effective as of October 28, 1994, Fuel Tech granted two licenses to the
Company for all patents and rights associated with its Platinum Fuel Catalyst
("PFC") technology. Effective November 24, 1997, the licenses were canceled and
Fuel Tech assigned to the Company all such patents and rights on terms
substantially similar to the licenses. In exchange for the assignment, the
Company will pay Fuel Tech a royalty of 2.5% of its annual gross revenue from
sales of the PFCs, commencing in 1998. The royalty obligation expires in 2008.
The Company may terminate the royalty obligation to Fuel Tech by payment of
$10,909,091 in 1999 and declining annually to $1,090,910 in 2008. The Company as
assignee and owner will maintain the technology at its own expense. To date no
royalties have been paid to Fuel Tech.

       For the nine months ended September 30, 1999 and 1998, and for the period
from January 1, 1992, through September 30, 1999, the Company used cash of
$1,861,000, $2,180,000, and $15,200,000, respectively, in operating activities.

       At September 30, 1999, and December 31, 1998, the Company had cash and
cash equivalents of $1,519,000 and $1,663,000, respectively. The decrease in
cash and cash equivalents in the first nine months of 1999 was the result of the
Company's use of its resources to fund operations in 1999, largely offset by the
funds raised in the third quarter of 1999. Working capital remained relatively
flat increasing to $1,270,000 at September 30, 1999, from $1,254,000 at December
31, 1998. The Company anticipates incurring additional losses through at least
the first half of 2000 as it further pursues its commercialization efforts. In
light of this, the Company is taking steps to minimize expenditures until such
time as it is able to generate a positive cash flow.

       As a result of the Company's recurring operating losses, the Company has
been unable to generate a positive cash flow. In management's opinion, the
funding obtained in the third quater of 1999 along with the existing cash
balances will be sufficient to fund the Company's operations until June 2000. In
June 1999, the Company announced plans to license its NOx reduction business,
which has started to generate commercial sales. As more fully described
elsewhere herein (see "Note to Financial Statements -- Subsequent Event), in
November 1999, the Company entered into a letter of intent for its patented ARIS
stationary diesel technology for a $1 million payment plus an on-going royalty.
The pending license agreement is for stationary diesel, railroad and marine
engines in North, Central and South America. The agreement is expected to be
consummated on January 15, 2000, upon the successful completion of due diligence
by RJM. If the Company is successful in licensing this business, the Company's
management believes that it will have sufficient cash balances to finance its
operations into the first quarter of 2001. If the Company is unable to license
its NOx reduction business and/or realize commercial sales from its Platinum
Plus additives or ARIS 2000 systems, the Company will require additional capital
to fund its operations. Although the Company believes that it will be successful
in its capital-raising efforts, should they be necessary, there is no guarantee
that it will be able to raise such funds on terms that will be satisfactory to
the Company. The Company will develop contingency plans in the event future
financing efforts, if required, are not successful. Such plans may include
reducing expenses and selling or licensing some of the Company's technologies.
Accordingly, at September 30, 1999, there is substantial doubt as to the
Company's ability to continue as a going concern. See "Note to Financial
Statements -- Going Concern" elsewhere herein for additional information.

Impact of Year 2000
       The costs of the planned Year 2000 ("Y2K") modifications and the dates by
which the Company expects to complete its plans are based on management's best
estimates, which were derived utilizing numerous assumptions of future events,
including continued availability of certain resources, third-party modification
plans, and other factors. Specific factors that might cause differences between
the estimates and actual results include, but are not limited to, the
availability and cost of personnel trained in these areas, the ability to locate
and correct all relevant computer codes, changes in consulting fees and costs to
remediate and replace hardware and software, as well as non-incremental costs
resulting from redeployment of internal resources, timely responses to and
corrections by third parties, such as significant customers and suppliers, and
similar uncertainties.


                                      -12-
<PAGE>

       The Year 2000 issue is the result of computer programs being written
using two digits rather than four to define the applicable year. The issue
arises if date-sensitive software recognizes a date using "00" as the year 1900
rather than the year 2000. This could result in a system failure or
miscalculations causing disruptions of operations, including, among other
things, a temporary inability to process transactions, send invoices, or engage
in similar normal business activities.

       The Company has identified three information technology ("IT") and non-IT
areas for which Y2K compliance is critical to the normal and routine operations
of the Company. These areas are:

       1) commercial off-the-shelf software

       2) computer hardware and embedded processors

       3) facilities-related applications and processes, such as communications
          and equipment with embedded chips

       The Company uses commercial off-the-shelf software and hardware, which,
based on the representations of the vendors and consultants, are or will be Y2K
compliant. The Company is also evaluating the possible effects of the Y2K issue
on its key suppliers, contractors, and vendors. Although the possible effects of
the Y2K issue on these parties are beyond the control of the Company, the
Company has initiated a process to communicate with these parties to inform them
of the Company's Y2K strategy and to determine their own Y2K strategies and
readiness. The Company estimates that the total cost of its Year 2000 compliance
program will be insignificant, and will primarily require the purchase of new
hardware and/or software (although a portion of the hardware and software would
have been purchased by the Company through the regular and routine upgrading of
systems). Such hardware and software will be capitalized and depreciated over
the estimated useful life of the related asset. All other expenditures will be
charged to expense. At September 30, 1999, the Company had expended less than
$10,000 specifically for the Y2K problem.

Year 2000 Program

         At September 30, 1999, the Company was actively engaged in one or more
compliance phases with respect to each of the three areas described above.
Although there can be no guarantee of complete readiness by the year 2000, the
Company believes each of the areas described above will be Y2K compliant before
December 31, 1999, such that further remediation and testing, if any, will not
be significant to its operations. However, as discussed above, the Company has
not completed its Year 2000 compliance program. In the event the Company does
not complete its program, or fails to identify and modify critical business
applications, there may be an interruption to the Company's business that may
have a materially adverse impact on its future financial condition and results
of operations. In addition, Y2K-related disruptions in the economy in general
may also have a materially adverse impact on the Company's future financial
condition and results of operations.

Risks
         The failure to identify and correct a Year 2000 problem could result in
an interruption in, or failure of, certain normal business activities or
operations. The Company does not expect such failures to have a materially
adverse impact on its results of operations or financial condition. However,
because of the general uncertainty about Year 2000 readiness throughout the
world economy, which results in uncertainties regarding the readiness of the
Company's vendors, contractors, and potential customers, the Company is
currently unable to determine whether Year 2000 problems may have a materially
adverse impact on its results of operations or financial condition. As the
Company's Year 2000 compliance program progresses, the level of uncertainty
about this matter will reduce, especially as to uncertainties concerning the
Company's own degree of Y2K compliance and the compliance of its suppliers and
contractors.


                                      -13-

<PAGE>

Worst Case Scenario

         It is not possible to describe a reasonably likely "worst case Year
2000 scenario" without making numerous assumptions. The Company presently
believes that a most likely worst case scenario would make it necessary for the
Company to replace some suppliers and contractors, rearrange work plans, or,
perhaps, interrupt some office and field activities. Assuming this assessment is
correct, the Company does not believe that such circumstances would have a
materially adverse impact on its financial condition or results of operations,
even if it is necessary to incur additional costs to correct unanticipated
compliance failures.

Contingency Plans

         The Company currently has no contingency plans in place in the event it
does not complete all phases of its Y2K compliance program by December 31, 1999.
However, it expects to have completed enough of its compliance program by
November 30, 1999 that it will be able to identify those areas for which
contingency plans will be necessary, and it will develop the required
contingency plans at that time. The Company continues to monitor carefully the
progress of its Year 2000 program and its state of readiness. Any future
contingency plan will be based on its best estimate of numerous factors, which,
in turn will be derived by relying on numerous assumptions of future events.
However, there can be no assurance that these assumptions or estimates will have
been made correctly, or that the Company will have anticipated all relevant
factors, or that there will not be a delay in or increased costs associated with
the Company's Y2K program. Any delay in implementation of the Year 2000 program
could affect the Company's Year 2000 readiness. Specific factors that might
cause the actual outcome to differ from the projected outcome include, without
limitation, the continued availability of personnel and consultants trained in
the computer programming skills necessary for remediation of Year 2000 problems,
the ability to locate and correct all relevant computer codes and embedded
software, timely responses by third parties, including suppliers, contractors,
and potential customers, and the ability to implement interfaces between new
systems and systems not being replaced.

       This discussion regarding the Year 2000 Issue is a "Year 2000 Readiness
Disclosure" as the term is described in the Year 2000 Information and Readiness
Disclosure Act of 1998.

                                      -14-

<PAGE>




PART II.     OTHER INFORMATION

Item 1.      Legal Proceedings
             None

Item 2.      Changes in Securities
             a. As reported in Item 4, below, the authorized number of shares of
             the Company's Series A Convertible Preferred Stock increased
             effective August 23, 1999, from 10,000 shares to 15, 000 shares.

             b. None

             c. During the period of the Report 3,500 shares of the Company's
             Series A Convertible Preferred Stock were sold in a private
             placement at the price of $500 per share pursuant to a Regulation S
             exemption from registration under the Securities Act of 1933 to 25
             European investors, 1,000 shares on July 29, 1999, 2,000 shares on
             July 30, 1999, and 500 shares on August 4, 1999. Pursuant to the
             terms of the Company's articles of incorporation, the 3,500 shares
             of Preferred Stock sold are convertible into 1,166,655 common
             shares of the Company. Fees for completing this financing were
             $29,000 and warrants to purchase 88,500 shares of the Company's
             Common Stock at $1.50 per share. The proceeds of this financing
             shall be used for the Company's general corporate purposes.

Item 3.      Defaults upon Senior Securities
             None

Item 4.      Submission of Matters to a Vote of Security Holders
             Effective August 20, 1999, 60% of the outstanding holders of Series
             A Convertible Preferred Stock of the Company authorized by forms of
             written consent the filing of an amendment to the articles of
             incorporation of the Company to increase the authorized number of
             Series A Convertible Preferred Shares from 10,000 to 15, 000.

Item 5.      Other Information
             None

Item 6.      Exhibits and Reports on Form 8-K
             a. Exhibits
                None

             b. Reports on Form 8-K
                The Company filed a report on Form 8-K dated August 5, 1999,
             providing information in that Form 8-K under Item 5 "Other Events,"
             concerning the financing reported above under Item 2 of this Form
             10-Q.

                                      -15-
<PAGE>







                         CLEAN DIESEL TECHNOLOGIES, INC.
                                   SIGNATURES



         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



                         CLEAN DIESEL TECHNOLOGIES, INC.



Date:  November 17, 1999           By:  /s/Jeremy D. Peter-Hoblyn
                                        --------------------------------
                                        Jeremy D. Peter-Hoblyn
                                        Chief Executive Officer, President
                                        and Director


Date:  November 17, 1999           By:  /s/Scott M. Schecter
                                        --------------------------------
                                        Scott M. Schecter
                                        Chief Financial Officer, Vice President
                                        and Treasurer

                                      -16-