HOUSTON, May 10 /PRNewswire-FirstCall/ -- Dan F. Smith, President and Chief Executive Officer of Lyondell Chemical Company (NYSE: LYO), will address analysts at the following event:

   Analyst           Goldman Sachs Basic Materials Conference in New York
   Conference:       Tuesday, May 23, 2006, at 10:15 a.m. EDT

   Web Site Access:  Live audio-only webcasting will be provided in
                     RealPlayer™ and Windows Media formats. Beginning at
                     10:15 a.m. 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 May 24, 2006,
                     at http://www.lyondell.com/investorpresentations .
                     The replay will be available until November 2006.

   Presentation:     The slides will be available at the time of the
                     presentation and afterward 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

Web site: http://www.lyondell.com/
http://www.lyondell.com/investorpresentations