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Summary. Calculations on the strongly cancerogenic indeno[1,2,3-c,d]pyrene and all its possible primary and secondary ozonides by the MNDO method indicate the breaking of the C21-C22 bond of the pyrene fragment as the energetically most favourable first step of the oxidative degradation. Localization energies calculated within the simple Hückel model predict that the attack of the C21-C22 pair by ozone is most probably also kinetically the most preferred reaction path. The rather low localization energy of C20 in the pyrene fragment indicates the possibility of competitive reactions between ozonolysis and the formation of phenols and quinones. The theoretical results are supported by experimental findings on the ozonation of indeno[1,2,3-c,d]pyrene in aqueous medium.