| Lyondell Chemical Company Announces Execution of Supplemental Indentures with Respect to its 8% Senior Secured Notes Due 2017 and 11% Senior Secured Notes Due
 2018 and Expiration of Withdrawal Rights
 
 ROTTERDAM, Netherlands, April 4, 2012 /PRNewswire via COMTEX/ -- LyondellBasell
 Industries N.V. (LYB) today announced that holders of more than a majority of the
 outstanding principal amount of Lyondell Chemical Company's ("Lyondell Chemical")
 8% Senior Secured Dollar Notes due 2017 (the "Dollar Notes") and 8% Senior
 Secured Euro Notes due 2017 (the "Euro Notes" and, together with the Dollar
 Notes, the "8% Notes") and holders of more than a majority of the outstanding
 principal amount of Lyondell Chemical's 11% Senior Secured Notes due 2018 (the
 "11% Notes" and, together with the 8% Notes, the "Notes")[1] have provided
 consents to adopt the proposed amendments described in Lyondell Chemical's Offer
 to Purchase and Consent Solicitation Statement dated March 26, 2012 (the
 "Statement"). As a result, Lyondell Chemical and the trustees under the
 indentures have executed supplemental indentures (the "Supplemental Indentures")
 to amend the indentures governing the Notes to eliminate substantially all of the
 covenants in the indentures governing such Notes, which will not become operative
 until Lyondell Chemical consummates its previously announced cash tender offers
 described in the Statement.
 
 Withdrawal and revocation rights have expired with respect to the tender offers
 and the consent solicitations (the "Offer") pursuant to the Statement.
 
 Holders who have not tendered their Notes may still do so pursuant to the
 Statement, until 11:59 p.m., New York City time, on April 20, 2012, unless the
 Offer is extended or earlier terminated by Lyondell Chemical. However, holders
 who tender their Notes and deliver their consents after the previously announced
 consent payment expiration deadline of 5:00 p.m., New York City time, on April 6,
 2012 will not be entitled to receive the previously announced consent payment of
 $30.00 per $1,000 (or euro 30.00 per euro 1,000 in the case of the Euro Notes)
 principal amount of Notes.
 
 The complete terms and conditions of the Offer are described in the Statement and
 related Letter of Transmittal and Consent (the "Letter of Transmittal"), copies
 of which may be obtained by contacting D.F. King & Co., Inc. as the depositary
 and information agent at (800) 290-6427 (toll free). Credit Suisse and Citigroup
 are acting as the Lead Dealer Managers and Solicitation Agents for the Offer.
 J.P. Morgan, BofA Merrill Lynch and Deutsche Bank Securities are acting as Joint
 Dealer Managers and Solicitation Agents for the Offer. For additional information
 regarding the terms of the Offer, please contact: Credit Suisse at (800) 820-1653
 (toll free) or (212) 325-5912 (collect) or Citigroup at (800) 558-3745 (toll
 free) or (212) 723-6106 (collect).
 
 THIS PRESS RELEASE IS FOR INFORMATIONAL PURPOSES ONLY AND IS NOT AN OFFER TO
 PURCHASE, A SOLICITATION OF AN OFFER TO PURCHASE OR A SOLICITATION OF CONSENT
 WITH RESPECT TO ANY SECURITIES. THE OFFER IS BEING MADE SOLELY PURSUANT TO THE
 STATEMENT AND LETTER OF TRANSMITTAL, WHICH SET FORTH THE COMPLETE TERMS OF THE
 OFFER WHICH HOLDERS OF THE NOTES SHOULD CAREFULLY READ PRIOR TO MAKING ANY
 DECISION.
 
 NEITHER THE TENDER OFFERS NOR THE CONSENT SOLICITATIONS ARE BEING MADE TO HOLDERS
 OF NOTES IN ANY JURISDICTION IN WHICH THE MAKING OF OR ACCEPTANCE OF THE TENDER
 OFFERS OR THE CONSENT SOLICITATIONS WOULD NOT BE IN COMPLIANCE WITH THE LAWS OF
 SUCH JURISDICTION. LYONDELL CHEMICAL EXPRESSLY RESERVES THE RIGHT, SUBJECT TO
 APPLICABLE LAW, TO TERMINATE THE TENDER OFFERS AND/OR THE CONSENT SOLICITATIONS.
 THIS PRESS RELEASE DOES NOT CONSTITUTE A NOTICE OF REDEMPTION OR AN OBLIGATION TO
 ISSUE A NOTICE OF REDEMPTION IN RESPECT OF ANY OF THE NOTES.
 
 THE PREVIOUSLY ANNOUNCED OFFERING OF LYONDELLBASELL INDUSTRIES N.V.'S 5.000%
 SENIOR NOTES DUE 2019 AND 5.750% SENIOR NOTES DUE 2024 HAVE NOT BEEN REGISTERED
 UNDER THE SECURITIES ACT OF 1933, AS AMENDED OR THE SECURITIES LAWS OF ANY OTHER
 JURISDICTION AND MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES WITHOUT
 REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED OR AN APPLICABLE
 EXEMPTION FROM REGISTRATION REQUIREMENTS. THIS PRESS RELEASE DOES NOT CONSTITUTE
 AN OFFER TO SELL, OR THE SOLICITATION OF AN OFFER TO BUY, ANY SECURITIES AND
 SHALL NOT CONSTITUTE AN OFFER, SOLICITATION OR SALE IN ANY JURISDICTION IN WHICH
 SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL.
 
 About LyondellBasell
 
 LyondellBasell (LYB) is one of the world's largest plastics, chemical and
 refining companies. The company manufactures products at 58 sites in 18
 countries. LyondellBasell products and technologies are used to make items that
 improve the quality of life for people around the world including packaging,
 electronics, automotive parts, home furnishings, construction materials and
 biofuels. More information about LyondellBasell can be found at
 lyondellbasell.com.
 
 This press release contains forward-looking statements as defined in the Private
 Securities Litigation Reform Act of 1995. Forward-looking statements are
 information of a non-historical nature or which relate to future events and are
 subject to risks and uncertainties. In many cases, you can identify
 forward-looking statements by terminology such as "may," "will," "should,"
 "expects," "plans," "anticipates," "believes," "estimates," "predicts,"
 "potential," or "continue," or the negative of these terms and other comparable
 terminology. These statements are only predictions. Actual results could differ
 materially from those anticipated in these forward-looking statements as a result
 of a number of factors. The forward-looking statements made in this press release
 relate only to events as of the date of this release. We undertake no ongoing
 obligation to update these statements.
 
 [1] The liens on all of the collateral securing the Notes have been released
 pursuant to previously executed supplemental indentures to the indentures
 governing such Notes.
 
 Media Contact: David A. Harpole +1 713-309-4125 Investor Contact: Douglas J. Pike
 +1 713-309-7141
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