The photodissociation of ozone trapped at high dilution in solid argon has been reinvestigated at different temperatures and various photon flux, combining irradiation at 266 nm and infrared spectroscopy. In argon, recombination of O+O-2 is a major pathway and the weak decrease of ozone is due to cage exit of oxygen atoms which is dependent of the temperature and of the initial photon flux. Kinetic curves are well fitted by a double exponential expression and a model based upon two different cage exit pathways is proposed.