[en] Long-time records of ¹⁴C (1960-1998) and 3^H (1976-1998) isotopes in the atmosphere at several sites in Croatia and the comparison with similar measurements in the world are discussed. Both ¹⁴C and ³H follow the global changes typical for the Northern Hemisphere. ¹⁴C activity of the atmospheric CO₂, plants and tree-rings collected in the so-called 'cline-air' site Plitvice reflects global distribution of ¹⁴C in the atmosphere. Seasonal fluctuations of ¹⁴C activity in Zagreb area are a result of fossil fuel combustion in winter time. Global ¹⁴C contamination of the atmosphere is also reflected in the ¹⁴C activity of dissolved inorganic carbon in surface water as well as in recent lake sediments. Long-time record of ³H in monthly precipitation collected in Zagreb is used as a database for monitoring local contamination as well as for hydrological investigations. ³H activity of tree-rings and old wines has been used for reconstruction of ³H activity in the past. Global ³H contamination of the atmosphere is also reflected in the surface water as well as in old ice deposits. (author)