A detailed kinetic mechanism based on elementary steps is used to model the oxidation of low concentration of dibenzofuran in a post-combustion area of municipal waste incinerator. In a first approach, some simplifications are used, polychlorodibenzofuranes are represented by the dibenzofuran molecule and the post-combustion area is modeled by a continuous stirred reactor. The mechanism consists in 213 species involved in 1200 elementary steps and describes the dibenzofuran oxidation. This model has been validated on experimental data of dibenzofuran oxidation realized in a perfectly stirred reactor. The simulations performed show that the reactivity of dibenzofuran strongly decreases when this species is very diluted. The oxidation reaction starts when the radical concentration increases with the temperature or with the reactant concentration through the initiation rate and branching steps. An addition of methane or VOCs, such as toluene, induces an important increasing of radical concentration and promotes the dibenzofuran oxidation. This oversimplified approach brings a new contribution to understand the complex reaction of poly-chorodibenzofurans oxidation. (C) 2012 Elsevier B.V. All rights reserved.