HOUSTON, Sept. 26 /PRNewswire-FirstCall/ -- Kevin DeNicola, Sr. Vice
President and Chief Financial Officer of Lyondell Chemical Company
(NYSE: LYO), will address analysts and discuss the effects of Hurricane Rita
at the following event:

     Analyst              Credit Suisse First Boston's 18th Annual Chemical
     Conference:          Conference in New York, Tuesday, September 27, 2005,
                          at noon EDT.

     Web Site Access:     Live audio-only webcasting will be provided in
                          RealPlayer(TM) and Windows Media formats.  Beginning
                          at noon EDT on the day of the event, the webcast can
                          be accessed at
                          http://www.lyondell.com/investorpresentations .

                          The replay webcast will be available on
                          September 28, 2005, at
                          http://www.lyondell.com/investorpresentations .
                          The replay will be available until October 26, 2005.

     Presentation:        The slides will be available at the time of the
                          presentation and afterwards at
                          http://www.lyondell.com/investorpresentations .

     Related Disclosures: Reconciliations of non-GAAP financial measures to
                          GAAP financial measures and any other applicable
                          disclosures (including the slides) will be available
                          at the time of the presentations and afterwards at
                          http://www.lyondell.com/investorpresentations.

    ABOUT LYONDELL

Lyondell Chemical Company, headquartered in Houston, Texas, is North America's third-largest independent, publicly traded chemical company. Lyondell is a major global manufacturer of basic chemicals and derivatives including ethylene, propylene, titanium dioxide, styrene, polyethylene, propylene oxide and acetyls. It also is a significant producer of gasoline blending components. The company has a 58.75 percent interest in LYONDELL- CITGO Refining LP, a refiner of heavy, high-sulfur crude oil. As a result of Lyondell's November 30, 2004, acquisition of Millennium Chemicals Inc., Millennium and Equistar Chemicals, LP are wholly owned subsidiaries of Lyondell. Lyondell is a global company operating on five continents and employs approximately 10,000 people worldwide.

SOURCE: Lyondell Chemical Company

CONTACT: media, Susan P. Moore, +1-713-309-4645, or investors, Douglas J. Pike, +1-713-309-4590, both of Lyondell Chemical Company