<SUBMISSION>
<ACCESSION-NUMBER>0000950123-11-062554
<TYPE>S-1MEF
<PUBLIC-DOCUMENT-COUNT>5
<REFERENCE-462B>333-174680
<FILING-DATE>20110628
<DATE-OF-FILING-DATE-CHANGE>20110628
<EFFECTIVENESS-DATE>20110628
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>CLEAN DIESEL TECHNOLOGIES INC
<CIK>0000949428
<ASSIGNED-SIC>3564
<IRS-NUMBER>061393453
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>S-1MEF
<ACT>33
<FILE-NUMBER>333-175193
<FILM-NUMBER>11937105
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>4567 TELEPHONE ROAD
<STREET2>SUITE 206
<CITY>VENTURA
<STATE>CA
<ZIP>93003
<PHONE>805 639 9458
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4567 TELEPHONE ROAD
<STREET2>SUITE 206
<CITY>VENTURA
<STATE>CA
<ZIP>93003
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>S-1MEF
<SEQUENCE>1
<FILENAME>v59644m1sv1mef.htm
<DESCRIPTION>FORM S-1MEF
<TEXT>
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<HEAD>
<TITLE>sv1mef</TITLE>
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<DIV align="center" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B>As filed with the Securities and Exchange Commission on
    June&#160;28, 2011</B>
</DIV>

<DIV align="right" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B>Registration
    <FONT style="white-space: nowrap">No.&#160;333-&#160;&#160;&#160;&#160;&#160;&#160;</FONT></B>
</DIV>

<CENTER><DIV style="font-size: 1pt; width: 100%; border-bottom: 2pt solid #000000"></DIV></CENTER>

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<DIV style="margin-top: 4pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B><FONT style="font-size: 13pt">UNITED STATES SECURITIES AND
    EXCHANGE COMMISSION<BR>
    </FONT><FONT style="font-size: 12pt">Washington,&#160;D.C.
    20549</FONT></B>
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="margin-top: 1pt; font-size: 1pt">&nbsp;</DIV>

<CENTER><DIV style="font-size: 1pt; width: 15%; border-bottom: 1pt solid #000000"></DIV></CENTER>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="margin-top: 1pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B><FONT style="font-size: 17pt"><FONT style="white-space: nowrap">Form&#160;S-1</FONT><BR>
    </FONT></B>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B><FONT style="font-size: 12pt">REGISTRATION STATEMENT <BR>
    UNDER<BR>
    THE SECURITIES ACT OF 1933</FONT></B>
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="margin-top: 1pt; font-size: 1pt">&nbsp;</DIV>

<CENTER><DIV style="font-size: 1pt; width: 15%; border-bottom: 1pt solid #000000"></DIV></CENTER>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="margin-top: 1pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B><FONT style="font-size: 22pt">Clean Diesel Technologies,
    Inc.<BR>
    </FONT></B><I><FONT style="font-size: 8pt">(Exact name of
    registrant as specified in its charter)</FONT></I>
</DIV>

<DIV style="margin-top: 1pt; font-size: 1pt">&nbsp;</DIV>

<TABLE border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
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    <TD width="32%">&nbsp;</TD>	<!-- colindex=02 type=maindata -->
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    <TD width="32%">&nbsp;</TD>	<!-- colindex=03 type=maindata -->
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<TD align="center" valign="top">
<DIV style="text-indent: -10pt; margin-left: 10pt">
    <B>Delaware<BR>
    </B><I><FONT style="font-size: 8pt">(State or other jurisdiction
    of <BR>
    incorporation or organization)</FONT></I>
</DIV>
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    <B>2810<BR>
    </B><I><FONT style="font-size: 8pt">(Primary Standard
    Industrial<BR>
    Classification Code Number)</FONT></I>
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    <B><FONT style="white-space: nowrap">06-1393453</FONT><BR>
    </B><I><FONT style="font-size: 8pt">(I.R.S. Employer<BR>
    Identification No.)</FONT></I><FONT style="font-size: 8pt">
    </FONT>
</TD>
</TR>
</TABLE>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV>

<DIV style="margin-top: 18pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">4567
    Telephone Road, Suite&#160;206<BR>
    Ventura, California 93003<BR>
    <FONT style="white-space: nowrap">(805)&#160;639-9458</FONT><BR>
    </FONT></B><I><FONT style="font-size: 8pt"><FONT style="font-family: 'Times New Roman', Times">(Address,
    including zip code, and telephone number, including area code,
    of registrant&#146;s principal executive
    offices)</FONT></FONT></I>
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<CENTER><DIV style="font-size: 1pt; width: 15%; border-bottom: 1pt solid #000000"></DIV></CENTER>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">Nikhil A.
    Mehta<BR>
    Chief Financial Officer and Treasurer<BR>
    4567 Telephone Road, Suite&#160;206<BR>
    Ventura, California 93003<BR>
    <FONT style="white-space: nowrap">(805)&#160;639-9458</FONT><BR>
    </FONT></B><I><FONT style="font-size: 8pt"><FONT style="font-family: 'Times New Roman', Times">(Name,
    address, including zip code, and telephone number, including
    area code, of agent for service)</FONT></FONT></I>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><I><FONT style="font-family: 'Times New Roman', Times">Copies
    to:</FONT></I></B>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<TABLE border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
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    <TD width="49%">&nbsp;</TD>	<!-- colindex=02 type=maindata -->
</TR>
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<TR valign="bottom">
<TD align="center" valign="top">
<DIV style="text-indent: -10pt; margin-left: 10pt">
    <B>Robert M. Smith<BR>
    Marianne C. Sarrazin<BR>
    Reed Smith LLP<BR>
    101 Second Street, Suite 1800<BR>
    San&#160;Francisco, California 94105<BR>
    (415) 659-5955</B>
</DIV>
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    <B>R. Scott Shean<BR>
    B. Shayne Kennedy<BR>
    Latham &#038; Watkins LLP<BR>
    650 Town Center Drive,
    20<SUP style="font-size: 85%; vertical-align: top">th</SUP></B>

    <B>Floor<BR>
    Costa Mesa, California 92626-1925<BR>
    (714) 540-1235</B>
</TD>
</TR>
</TABLE>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B>Approximate date of commencement of proposed sale to the
    public:</B>&#160;&#160;As soon as practicable after the
    effective date of this Registration Statement.
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    If any of the securities being registered on this Form are to be
    offered on a delayed or continuous basis pursuant to
    Rule&#160;415 under the Securities Act of 1933 check the
    following
    box.&#160;&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#111;
    </FONT>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    If this Form is filed to register additional securities for an
    offering pursuant to Rule&#160;462(b) under the Securities Act,
    please check the following box and list the Securities Act
    registration statement number of the earlier effective
    registration statement for the same
    offering.&#160;&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#254;</FONT><FONT style="white-space: nowrap">&#160;&#160;333-174680</FONT>
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    If this Form is a post-effective amendment filed pursuant to
    Rule&#160;462(c) under the Securities Act, check the following
    box and list the Securities Act registration statement number of
    the earlier effective registration statement for the same
    offering.&#160;&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#111;
    </FONT>
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    If this Form is a post-effective amendment filed pursuant to
    Rule&#160;462(d) under the Securities Act, check the following
    box and list the Securities Act registration statement number of
    the earlier effective registration statement for the same
    offering.&#160;&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#111;
    </FONT>
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    Indicate by check mark whether the registrant is a large
    accelerated filer, an accelerated filer, a non-accelerated
    filer, or a smaller reporting company. See the definitions of
    &#147;large accelerated filer,&#148; &#147;accelerated
    filer&#148; and &#147;smaller reporting company&#148; in
    <FONT style="white-space: nowrap">Rule&#160;12b-2</FONT>
    of the Exchange Act. (Check one):
</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<TABLE border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
<!-- Table Width Row BEGIN -->
<TR style="font-size: 1pt" valign="bottom">
    <TD width="21%">&nbsp;</TD>	<!-- colindex=01 type=maindata -->
    <TD width="5%">&nbsp;</TD>	<!-- colindex=02 type=gutter -->
    <TD width="13%">&nbsp;</TD>	<!-- colindex=02 type=maindata -->
    <TD width="5%">&nbsp;</TD>	<!-- colindex=03 type=gutter -->
    <TD width="31%">&nbsp;</TD>	<!-- colindex=03 type=maindata -->
    <TD width="5%">&nbsp;</TD>	<!-- colindex=04 type=gutter -->
    <TD width="20%">&nbsp;</TD>	<!-- colindex=04 type=maindata -->
</TR>
<!-- Table Width Row END -->
<!-- TableOutputHead -->
<!-- TableOutputBody -->
<TR valign="bottom">
<TD align="center" valign="top">
<DIV style="text-indent: -9pt; margin-left: 9pt">
    Large accelerated
    filer&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#111;
    </FONT>
</DIV>
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="top">
    Accelerated
    filer&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#111;
    </FONT>
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    Non-accelerated
    filer&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#111;</FONT><BR>
    (Do not check if a smaller reporting company)
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    Smaller reporting
    company&#160;<FONT style="font-family: Wingdings; font-variant: normal">&#254;</FONT>
</TD>
</TR>
</TABLE>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">CALCULATION
    OF REGISTRATION FEE</FONT></B>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<TABLE border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
<!-- Table Width Row BEGIN -->
<TR style="font-size: 1pt" valign="bottom">
    <TD width="36%">&nbsp;</TD>	<!-- colindex=01 type=maindata -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=02 type=gutterleft -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=02 type=gutterright -->
    <TD width="14%">&nbsp;</TD>	<!-- colindex=02 type=maindata -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=03 type=gutterleft -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=03 type=gutterright -->
    <TD width="14%">&nbsp;</TD>	<!-- colindex=03 type=maindata -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=04 type=gutterleft -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=04 type=gutterright -->
    <TD width="14%">&nbsp;</TD>	<!-- colindex=04 type=maindata -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=05 type=gutterleft -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=05 type=gutterright -->
    <TD width="14%">&nbsp;</TD>	<!-- colindex=05 type=maindata -->
</TR>
<!-- Table Width Row END -->
<!-- TableOutputHead -->
<TR style="font-size: 8pt" valign="bottom" align="center">
<TD nowrap align="center" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 3px double #000000">
    <B>Proposed Maximum<BR>
    </B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 3px double #000000">
    <B>Proposed Maximum<BR>
    </B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 3px double #000000">
    <B>Amount of<BR>
    </B>
</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom" align="center">
<TD nowrap align="center" valign="bottom">
    <B>Title of Each Class of <BR>
    </B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Amount<BR>
    </B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Offering<BR>
    </B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Aggregate<BR>
    </B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Registration<BR>
    </B>
</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom" align="center">
<TD nowrap align="center" valign="bottom">
    <B>Securities to be Registered</B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>to be Registered(1)</B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Price per Share(2)</B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Offering Price(3)</B>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
    <B>Fee</B>
</TD>
</TR>
<!-- TableOutputBody -->
<TR valign="bottom">
<TD align="left" valign="top" style="border-top: 1px solid #000000">
<DIV style="text-indent: -10pt; margin-left: 10pt">
    Common stock, par value $0.01 per share
</DIV>
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 1px solid #000000">
&nbsp;
</TD>
<TD style="border-top: 1px solid #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 1px solid #000000">
    718,750
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 1px solid #000000">
&nbsp;
</TD>
<TD style="border-top: 1px solid #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 1px solid #000000">
    $3.75
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 1px solid #000000">
&nbsp;
</TD>
<TD style="border-top: 1px solid #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 1px solid #000000">
    $2,695,312
</TD>
<TD style="border-right: 1px solid #000000; padding-right: 2pt; border-top: 1px solid #000000">
&nbsp;
</TD>
<TD style="border-top: 1px solid #000000">
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom" style="border-top: 1px solid #000000">
    $312.92
</TD>
</TR>
<TR style="font-size: 1pt">
<TD nowrap align="left" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="left" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="left" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="left" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD style="border-top: 3px double #000000">
&nbsp;
</TD>
<TD nowrap align="left" valign="bottom" style="border-top: 3px double #000000">
&nbsp;
</TD>
</TR>
</TABLE>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV>



<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="2%"></TD>
    <TD width="98%"></TD>
</TR>

<TR valign="top" style="font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <TD>    (1)&#160;
</TD>
    <TD align="left">    The shares being registered under this Registration Statement
    are in addition to the 2,415,000&#160;shares registered pursuant
    to the Registration Statement on
    <FONT style="white-space: nowrap">Form&#160;S-1</FONT>
    <FONT style="white-space: nowrap">(333-174680).</FONT>
</TD>
</TR>





<TR valign="top" style="font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <TD>    (2)&#160;
</TD>
    <TD align="left">    Based on the public offering price of $3.75 per share.
</TD>
</TR>





<TR valign="top" style="font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <TD>    (3)&#160;
</TD>
    <TD align="left">    Estimated in accordance with Rule&#160;457(a) of the Securities
    Act of 1933.
</TD>
</TR>

</TABLE>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 3%; font-size: 9pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <B>This Registration Statement shall become effective upon
    filing with the Securities and Exchange Commission in accordance
    with Rule&#160;462(b) under the Securities Act of 1933, as
    amended.</B>
</DIV>

<DIV style="margin-top: 4pt; font-size: 1pt">&nbsp;</DIV>

<CENTER><DIV style="font-size: 1pt; width: 100%; border-bottom: 1pt solid #000000"></DIV></CENTER>

<CENTER><DIV style="font-size: 1pt; width: 100%; border-bottom: 2pt solid #000000"></DIV></CENTER>
<!-- XBRL Pagebreak Begin -->

<P align="left" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV><!-- END PAGE WIDTH -->
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="width: 94%; margin-left: 3%"><!-- BEGIN PAGE WIDTH -->
<!-- XBRL Pagebreak End -->
</DIV><!-- END PAGE WIDTH -->
<DIV style="width: 87%; margin-left: 6%"><!-- BEGIN PAGE WIDTH -->

<DIV style="margin-top: 18pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">EXPLANATORY
    NOTE&#160;AND INCORPORATION BY REFERENCE</FONT></B>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    This registration statement is being filed with respect to the
    registration of additional shares of common stock, par value
    $0.01 per share, of Clean Diesel Technologies, Inc., a Delaware
    corporation, pursuant to Rule&#160;462(b) under the Securities
    Act of 1933, as amended. The contents of the earlier
    registration statement on
    <FONT style="white-space: nowrap">Form&#160;S-1,</FONT>
    as amended (File
    <FONT style="white-space: nowrap">No.&#160;333-174680),</FONT>
    which was declared effective by the Securities and Exchange
    Commission on June&#160;28, 2011, and all exhibits thereto are
    incorporated in this registration statement by reference.
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    The required opinion and consents are listed on an
    Exhibit&#160;Index attached hereto and filed herewith.
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    The Registrant hereby certifies that it (i)&#160;has initiated
    and released a wire transfer to transmit the filing fee set
    forth on the cover page of this Registration Statement to the
    Securities and Exchange Commission&#146;s account as soon as
    practicable (but no later than the close of business on
    June&#160;29, 2011), (ii)&#160;will not revoke such wire
    transfer, and (iii)&#160;has sufficient funds in the relevant
    account to cover the amount of such filing fee.
</DIV>
<!-- XBRL Pagebreak Begin -->

<P align="left" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV><!-- END PAGE WIDTH -->
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="width: 87%; margin-left: 6%"><!-- BEGIN PAGE WIDTH -->
<!-- XBRL Pagebreak End -->

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">PART&#160;II<BR>
    </FONT></B>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">INFORMATION
    NOT REQUIRED IN PROSPECTUS</FONT></B>
</DIV>

<DIV style="margin-top: 12pt; font-size: 1pt">&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

<TR>
    <TD width="9%"></TD>
    <TD width="91%"></TD>
</TR>

<TR valign="top">
    <TD>
    <B><FONT style="font-family: 'Times New Roman', Times">Item&#160;16.<I>&#160;&#160;</I></FONT></B>
</TD>
    <TD>
    <B><I><FONT style="font-family: 'Times New Roman', Times">Exhibits
    and Financial Statement Schedules.</FONT></I></B>
</TD>
</TR>

</TABLE>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    All exhibits filed with or incorporated by reference in
    Registration Statement
    <FONT style="white-space: nowrap">No.&#160;333-174680</FONT>
    are incorporated by reference into, and shall be deemed part of,
    this registration statement, except the following, which are
    filed herewith.
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<TABLE border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
<!-- Table Width Row BEGIN -->
<TR style="font-size: 1pt" valign="bottom">
    <TD width="4%" align="right">&nbsp;</TD>    <!-- colindex=01 type=lead -->
    <TD width="1%" align="right">&nbsp;</TD>    <!-- colindex=01 type=body -->
    <TD width="4%" align="left">&nbsp;</TD>     <!-- colindex=01 type=align1 -->
    <TD width="2%">&nbsp;</TD>  <!-- colindex=02 type=gutter -->
    <TD width="89%">&nbsp;</TD>         <!-- colindex=02 type=maindata -->
</TR>
<!-- Table Width Row END -->
<!-- TableOutputHead -->
<TR style="font-size: 8pt" valign="bottom" align="center">
<TD colspan="3" nowrap align="center" valign="bottom">
<DIV style="border-bottom: 1px solid #000000; width: 1%; padding-bottom: 1px">
    <B>Exhibit No.</B>
</DIV>
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
<DIV style="border-bottom: 1px solid #000000; width: 1%; padding-bottom: 1px">
    <B>Description of Exhibit</B>
</DIV>
</TD>
</TR>
<TR style="line-height: 3pt; font-size: 1pt">
<TD>&nbsp;
</TD>
</TR>
<!-- TableOutputBody -->
<TR valign="bottom">
<TD nowrap align="right" valign="top">
&nbsp;
</TD>
<TD nowrap align="right" valign="top">
    5
</TD>
<TD nowrap align="left" valign="top">
    .1*
</TD>
<TD>
&nbsp;
</TD>
<TD align="left" valign="top">
    Opinion of Reed Smith LLP as to validity of the securities
    issued.
</TD>
</TR>
<TR valign="bottom">
<TD nowrap align="right" valign="top">
&nbsp;
</TD>
<TD nowrap align="right" valign="top">
    23
</TD>
<TD nowrap align="left" valign="top">
    .1*
</TD>
<TD>
&nbsp;
</TD>
<TD align="left" valign="top">
    Consent of KPMG LLP, Independent Registered Public Accounting
    Firm.
</TD>
</TR>
<TR valign="bottom">
<TD nowrap align="right" valign="top">
&nbsp;
</TD>
<TD nowrap align="right" valign="top">
    23
</TD>
<TD nowrap align="left" valign="top">
    .2
</TD>
<TD>
&nbsp;
</TD>
<TD align="left" valign="top">
    Consent of Reed Smith LLP (included in Exhibit&#160;5.1).
</TD>
</TR>
<TR valign="bottom">
<TD nowrap align="right" valign="top">
&nbsp;
</TD>
<TD nowrap align="right" valign="top">
    24
</TD>
<TD nowrap align="left" valign="top">
    .1&#134;
</TD>
<TD>
&nbsp;
</TD>
<TD align="left" valign="top">
    Powers of Attorney
</TD>
</TR>
</TABLE>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="font-size: 1pt; margin-left: 0%; width: 13%;  align: left; border-bottom: 1pt solid #000000"></DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>



<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

<TR>
    <TD width="1%"></TD>
    <TD width="1%"></TD>
    <TD width="98%"></TD>
</TR>

<TR>
    <TD valign="top">
    * </TD>
    <TD></TD>
    <TD valign="bottom">
    Filed or furnished herewith</TD>
</TR>


<TR style="line-height: 3pt; font-size: 1pt"><TD>&nbsp;</TD></TR>

<TR>
    <TD valign="top">
    &#134; </TD>
    <TD></TD>
    <TD valign="bottom">
    Included on the signature page to the Registrant&#146;s
    Registration Statement on
    <FONT style="white-space: nowrap">Form&#160;S-1</FONT>
    (File
    <FONT style="white-space: nowrap">No.&#160;333-174680)</FONT>
    filed with the Commission on June&#160;2, 2011</TD>
</TR>

</TABLE>
<!-- XBRL Pagebreak Begin -->

<P align="center" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <BR>
    II-1
</DIV><!-- END PAGE WIDTH -->
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="width: 87%; margin-left: 6%"><!-- BEGIN PAGE WIDTH -->
<!-- XBRL Pagebreak End -->

<DIV align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent">

    <B><FONT style="font-family: 'Times New Roman', Times">SIGNATURES</FONT></B>
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    Pursuant to the requirements of the Securities Act of 1933, as
    amended, the registrant has duly caused this registration
    statement to be signed on its behalf by the undersigned,
    thereunto duly authorized, in the City of Ventura, State of
    California, on the 28th&#160;day of June, 2011.
</DIV>

<DIV style="margin-top: 24pt; font-size: 1pt">&nbsp;</DIV>

<DIV align="left" style="margin-left: 49%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    CLEAN DIESEL TECHNOLOGIES, INC.
</DIV>

<DIV style="margin-top: 48pt; font-size: 1pt">&nbsp;</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">

<TR>
    <TD width="49%"></TD>
    <TD width="4%"></TD>
    <TD width="47%"></TD>
</TR>

<TR valign="top" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <TD>&nbsp;</TD>
    <TD>    By:&#160;
</TD>
    <TD align="left">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">Charles
    F. Call</FONT></DIV>
</TD>
</TR>

</TABLE>

<DIV style="font-size: 2pt; margin-left: 53%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>

<DIV align="left" style="margin-left: 53%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    Charles F. Call
</DIV>

<DIV align="left" style="margin-left: 53%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    Chief Executive Officer
</DIV>

<DIV align="left" style="margin-left: 53%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    (Principal Executive Officer)
</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<TABLE border="0" width="100%" align="center" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
<!-- Table Width Row BEGIN -->
<TR style="font-size: 1pt" valign="bottom">
    <TD width="5%">&nbsp;</TD>	<!-- colindex=01 type=maindata -->
    <TD width="1%">&nbsp;</TD>	<!-- colindex=02 type=gutter -->
    <TD width="38%">&nbsp;</TD>	<!-- colindex=02 type=maindata -->
    <TD width="3%">&nbsp;</TD>	<!-- colindex=03 type=gutter -->
    <TD width="38%">&nbsp;</TD>	<!-- colindex=03 type=maindata -->
    <TD width="3%">&nbsp;</TD>	<!-- colindex=04 type=gutter -->
    <TD width="12%">&nbsp;</TD>	<!-- colindex=04 type=maindata -->
</TR>
<!-- Table Width Row END -->
<!-- TableOutputHead -->
<TR style="font-size: 8pt" valign="bottom" align="center">
<TD colspan="3" nowrap align="center" valign="bottom">
<DIV style="border-bottom: 1px solid #000000; width: 1%; padding-bottom: 1px">
    <B>Signature</B>
</DIV>
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
<DIV style="border-bottom: 1px solid #000000; width: 1%; padding-bottom: 1px">
    <B>Title</B>
</DIV>
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="bottom">
<DIV style="border-bottom: 1px solid #000000; width: 1%; padding-bottom: 1px">
    <B>Date</B>
</DIV>
</TD>
</TR>
<TR style="line-height: 12pt; font-size: 1pt">
<TD>&nbsp;
</TD>
</TR>
<!-- TableOutputBody -->
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">Charles
    F. Call</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Charles
    F. Call
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    Director, Chief Executive Officer (Principal Executive Officer)
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">Nikhil
    A. Mehta</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Nikhil
    A. Mehta
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    Chief Financial Officer (Principal Financial Officer)
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">*</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>David
    E. Shea
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    Controller (Principal Accounting Officer)
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">*</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Alexander
    &#147;Hap&#148; Ellis III
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    Chairman of the Board
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">*</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Bernard
    (&#147;Bud&#148;) H. Cherry
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="top">
    Director
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">*</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Charles
    R. Engles,&#160;Ph.D.
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="top">
    Director
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD colspan="3">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD colspan="3" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">*</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Mungo
    Park
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="top">
    Director
</TD>
<TD>
&nbsp;
</TD>
<TD align="center" valign="top">
    June 28, 2011
</TD>
</TR>
<TR valign="bottom" style="line-height: 12pt">
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
</TR>
<TR valign="bottom">
<TD nowrap align="center" valign="top">
    By:
</TD>
<TD>
&nbsp;
</TD>
<TD align="left" valign="top">
    <DIV style="display:inline; text-align:left;">/s/&#160;&#160;<FONT style="font-variant: SMALL-CAPS">Nikhil
    A. Mehta</FONT></DIV><BR>
    <DIV style="font-size: 2pt; margin-left: 0%; width: 100%;  align: left; border-bottom: 1pt solid #000000"></DIV>Nikhil
    A. Mehta,
    <FONT style="white-space: nowrap">Attorney-in-Fact</FONT>
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="top">
&nbsp;
</TD>
<TD>
&nbsp;
</TD>
<TD nowrap align="center" valign="top">
&nbsp;
</TD>
</TR>
</TABLE>

<DIV align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 0%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

</DIV>

<DIV style="margin-top: 6pt; font-size: 1pt">&nbsp;</DIV>

<DIV style="font-size: 1pt; margin-left: 0%; width: 13%;  align: left; border-bottom: 1pt solid #000000"></DIV>

<DIV style="margin-top: 3pt; font-size: 1pt">&nbsp;</DIV>



<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">

<TR>
    <TD width="1%"></TD>
    <TD width="1%"></TD>
    <TD width="98%"></TD>
</TR>

<TR>
    <TD valign="top">
    * </TD>
    <TD></TD>
    <TD valign="bottom">
    The undersigned does hereby sign this registration statement on
    behalf of the above indicated director and executive officer of
    Clean Diesel Technologies, Inc. pursuant to a power of attorney
    executed by such director and such executive officer.</TD>
</TR>

</TABLE>
<!-- XBRL Pagebreak Begin -->

<P align="center" style="font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent">
    <BR>
    II-2
</DIV><!-- END PAGE WIDTH -->
</BODY>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>v59644m1exv5w1.htm
<DESCRIPTION>EX-5.1
<TEXT>
<HTML>
<HEAD>
<TITLE>exv5w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><B>Exhibit&nbsp;5.1</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="48%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="48%">&nbsp;</TD>
</TR>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><IMG src="v59644m1v5964406.gif" alt="(REEDSMITH LOGO)">
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="bottom">Reed Smith LLP<BR>
101 Second Street <BR>
Suite&nbsp;1800<BR>
San Francisco, CA 94105-3659<BR>
&#043;1 415 543 8700<BR>
Fax &#043;1 415 391 8269<BR>
reedsmith.com</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">June&nbsp;28, 2011
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Clean Diesel Technologies, Inc.<BR>
4567 Telephone Road, Suite&nbsp;206<BR>
Ventura, CA 93003

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Ladies and Gentlemen:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have acted as counsel to Clean Diesel Technologies, Inc., a Delaware corporation (the
&#147;Company&#148;), in connection with the preparation and filing on June&nbsp;29, 2011 with the Securities and
Exchange Commission (the &#147;Commission&#148;) pursuant to Rule 462(b) under the Securities Act of 1933, as
amended (the &#147;Securities Act&#148;) of the Registration Statement on Form S-1 (the &#147;Abbreviated
Registration Statement&#148;) for the registration of an aggregate of 718,750 shares (the &#147;Additional
Shares&#148;) of the Company&#146;s common stock, $0.01 par value per share (the &#147;Common Stock&#148;). The
Additional Shares are being offered for sale together with the 2,415,000 shares of Common Stock
(the &#147;Initial Shares&#148;) previously registered pursuant to the Registration statement on Form S-1
(333-174680) of the Company that was declared effective by the Commission on June&nbsp;28, 2011 (the
&#147;Initial Registration Statement&#148;). Of the Initial Shares and Additional Shares (collectively, the
&#147;Shares&#148;) (i)&nbsp;up to 3,053,750 Shares will be issued and sold by the Company, including up to
408,750 Shares issuable upon exercise of an over-allotment option granted by the Company (the
&#147;Company Shares&#148;) and (ii)&nbsp;80,000 Shares (the &#147;Selling Stockholder Shares&#148;) will be sold by certain
stockholders of the Company (the &#147;Selling Stockholders&#148;). The Shares are to be sold by the Company
and the Selling Stockholders pursuant to an underwriting agreement (the &#147;Underwriting Agreement&#148;)
to be entered into by and among the Company, the Selling Stockholders and Roth Capital Partners,
LLC, as Representative of the several underwriters named therein, the form of which has been filed
as Exhibit&nbsp;1.1 to the Initial Registration Statement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In rendering the opinion set forth herein, we have examined originals or copies, certified or
otherwise identified to our satisfaction, of such documents, corporate records, certificates of
public officials and other instruments as we have deemed necessary or advisable.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="48%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="48%">&nbsp;</TD>
</TR>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Clean Diesel Technologies, Inc.<BR>
June&nbsp;29, 2011<BR>
Page 2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="bottom"><IMG src="v59644m1v5964407.gif" alt="(REEDSMITH LOGO)"></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In such examination, we have assumed the genuineness of all signatures, the legal capacity of
natural persons, the authenticity of all items submitted to us as originals, the conformity with
originals of all items submitted to us as copies, and the authenticity of the originals of such
copies. As to any facts material to the opinions expressed herein that we did not independently
establish or verify, we have relied upon statements and representations of officers and other
representatives of the Company and public officials. Our opinion in clause (ii)&nbsp;below, insofar as
it relates to the Selling Stockholder Shares being fully paid, is based solely on a certificate of
the Chief Financial Officer of the Company confirming the Company&#146;s receipt of the consideration
called for by the applicable resolutions authorizing the issuance of such Selling Stockholder
Shares.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This opinion is based solely on the General Corporation Law of the State of Delaware
(including all related provisions of the Delaware Constitution and all reported judicial decisions
interpreting the General Corporation Law of the State of Delaware and the Delaware Constitution).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Based upon and subject to the foregoing, we are of the opinion that (i)&nbsp;the Company Shares
have been duly authorized for issuance and, when issued, delivered and paid for in accordance with
the terms of the Underwriting Agreement, the Company Shares will be validly issued, fully paid and
nonassessable, and (ii)&nbsp;the Selling Stockholder Shares have been duly authorized and are validly
issued, fully paid and nonassessable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We consent to the inclusion of this opinion as an exhibit to the Abbreviated Registration
Statement and further consent to all references to us under the caption &#147;Legal Matters&#148; in the
Prospectus forming party of the Initial Registration Statement. In giving this consent, we do not
admit that we are in the category of persons whose consent is required under Section&nbsp;7 of the
Securities Act or the rules and regulations of the Commission.
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Very truly yours,
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">/s/ Reed Smith LLP
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Reed Smith LLP
</DIV>



<P align="center" style="font-size: 10pt"><!-- Folio -->- 2 -<!-- /Folio -->
</DIV>



</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>v59644m1exv23w1.htm
<DESCRIPTION>EX-23.1
<TEXT>
<HTML>
<HEAD>
<TITLE>exv23w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="right" style="font-size: 10pt; margin-top: 18pt"><B>Exhibit 23.1</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Consent of Independent Registered Public Accounting Firm</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Board of Directors<BR>
Clean Diesel Technologies, Inc.:

</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We consent to the use of our report dated March&nbsp;31, 2011, with respect to the consolidated balance
sheets of Clean Diesel Technologies, Inc. (the Company) as of December&nbsp;31, 2010 and 2009, and the
related consolidated statements of operations, stockholders&#146; equity and comprehensive loss, and
cash flows for the years then ended, incorporated herein by reference.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Our report dated March&nbsp;31, 2011 contains an explanatory paragraph that states that the Company has
suffered recurring losses from operations and has an accumulated deficit that raise substantial
doubt about its ability to continue as a going concern. The consolidated financial statements do
not include any adjustments that might result from the outcome of that uncertainty.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">/s/ KPMG LLP<BR>
Los Angeles, California<BR>
June&nbsp;28, 2011

</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio -->
</DIV>



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