HOUSTON, May 3 /PRNewswire-FirstCall/ -- Dan F. Smith, President and Chief Executive Officer of Lyondell Chemical Company (NYSE: LYO), will address analysts at the following event:

     Analyst           UBS Leveraged Finance Conference in Las Vegas, Nevada.
     Conference:       Thursday, May 12, 2005, at 9:15 a.m. Pacific Time.

     Web Site Access:  Live audio-only webcasting will be provided in
                       RealPlayer(TM) and Windows Media formats.  Beginning at
                       9:15 a.m. Pacific Time on the day of the event, the
                       webcast can be accessed at
                       http://www.lyondell.com/investorpresentations .

                       The replay webcast will be available by 1:00 p.m.
                       Pacific Time on May 12, 2005, at
                       http://www.lyondell.com/investorpresentations .
                       The replay will be available until June 12, 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