This paper presents a new code for the analysis of gamma spectra generated by an equipment for continuous measurement and identification of gamma radioactivity in aerosols with paper filter. It is called pGamma and has been developed by the NERG group at the Technical University of Catalonia - Barcelona Tech and Raditel Serveis i Subministraments Tecnològics, Ltd. The code is being adapted to the monitors of the Environmental Radiological Surveillance Network of the Generalitat de Catalunya (local Catalan Government), Spain. The code is a spectrum analysis system for identifying and determining activity concentration of gamma emitters. It generates alarms depending on the activity of emitters and then elaborates reports. Moreover, it includes a library with NORM and artificial emitters of interest. The code is being used at three stations of the Network equipped with an aerosol monitor (Ascó and Vandellòs (province of Tarragona)and Barcelona).