Exhibit 99.1 CERTIFICATION OF PERIODIC REPORT I, John C. Hunter III, Chief Executive Officer of Solutia Inc. (the "Company"), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that to the best of my knowledge: (1) the Quarterly Report on Form 10-Q of the Company for the quarterly period ended June 30, 2002, (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Dated: August 7, 2002 /s/ John C. Hunter III ----------------------- John C. Hunter III Chief Executive Officer