1. DIURNAL AND SEASONAL VARIATION OF CO2 IN URBAN AREAS FROM CLUJ COUNTY. Authors: M.S. BELDEAN-GALEA, IOVANCA HAIDUC, C. ROBA.2. VARIATION OF OUTDOOR RADON LEVELS IN URBAN AREAS OF CLUJ COUNTY. Authors: C. COSMA, F. COSMA, M.S. BELDEAN-GALEA, IONEL HAIDUC, A. DINU.