Webcast Alert: Lyondell Chemical Company Announces First-Quarter 2004 Teleconference Schedule HOUSTON, March 22 /PRNewswire-FirstCall/ -- Lyondell Chemical Company NYSE: LYO) announced the following schedule and contact information for its irst-quarter earnings release and teleconference: Earnings Release: April 22, 2004 8:30 a.m. Eastern Time By PR Newswire distribution and Lyondell web site at http://www.lyondell.com/earnings . Teleconference: April 22, 2004 11:30 a.m. Eastern Time Hosted by Doug Pike, Director, Investor Relations, and Kevin DeNicola, Senior Vice President and Chief Financial Officer. Listen-only mode via telephone and Internet broadcast on Lyondell's web site at http://www.lyondell.com/earnings . Dial-In Numbers: U.S. Toll Free: 888-391-2385 International: 484-644-0641 Please call 10 to 15 minutes before the scheduled start of the teleconference. Pass code: Lyondell Web Replay: Will be available at 1:30 p.m. Eastern Time on April 22 at http://www.lyondell.com/earnings . Telephone Replay: Will be available from 1:30 p.m. Eastern Time April 22 to 5:00 p.m. Eastern Time on April 30. The dial-in numbers are: United States: 800-294-4406, Pass Code 5549 International: 402-220-9778, Pass Code 5549 Related Disclosures: Reconciliations of non-GAAP financial measures to GAAP financial measures and any other applicable disclosures (including the earnings release) will be available at 11:30 a.m. Eastern Time on April 22 at http://www.lyondell.com/earnings . (Minimum requirements to listen to broadcast: The Windows Media Player software, downloadable free from http://www.microsoft.com/windows/windowsmedia/EN/default.asp , and at least a 28.8Kbps connection to the Internet, or the RealPlayer software, downloadable free from http://www.real.com/products/player/index.html , and at least a 28.8Kbps connection to the Internet. If you experience problems listening to the broadcast, send an email to .) DATASOURCE: Lyondell Chemical Company CONTACT: media, Susan P. Moore, +1-713-309-4645, or investors, Douglas J. Pike, +1-713-309-7141, both of Lyondell Chemical Company Web site: http://www.microsoft.com/windows/windowsmedia/EN/default.asp http://www.real.com/products/player/index.html Web site: http://www.lyondell.com/ http://www.lyondell.com/earnings

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