| Dividend & Tax Ruling PR.        HOUSTON and        LONDON, Sept. 10, 2013 /PRNewswire/ -- LyondellBasell (NYSE: LYB) today        announced that its Supervisory Board has authorized the company's        Management Board to declare an interim dividend of $0.50 per share to be        paid Oct. 7, 2013 to shareholders of record Sept. 23, 2013, with an        ex-dividend date of Sept. 19, 2013. The declaration is subject to the        adoption of a resolution by the Management Board, which is expected to        occur Sept. 23.         | LyondellBasell            Board Authorizes Interim Dividend |  
 Additionally, in August, the company received a        determination from tax authorities in the Netherlands and United Kingdom        that LyondellBasell is solely a U.K. tax resident effective July 1,        2013. As a result, the company will no longer withhold any non-U.S. tax        on its dividend payments to shareholders.
 
 LyondellBasell (NYSE:        LYB) is one of the world's largest plastics, chemical and refining        companies and a member of the S&P 500 Index. LyondellBasell        (www.lyondellbasell.com) 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.
 
 Media Contact: David A.        Harpole +1 713-309-4125
 
 Investor Contact: Douglas J. Pike +1        713-309-7141
 
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