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I. Introduction
The ultraviolet solar radiation B (range 280-320 nm) is strongly attenuated by ozone and aerosols (particles in suspension). From December of 1998 and during 1999 and 2000 measurements of profiles of ozone were carried out by means of a DIAL (Differential Absorption Lidar)(1) system, located in the surroundings of Buenos Aires (34.6º S, 58.5º W). In this work the influence of these profiles on the solar irradiances in the range UV (280-400 nm) is analysed.