Seed production and seed viability of Pinus nigra A r n o l d were evaluated with the aim to assess its generative power and reproductive ability in plantations on localities with different levels of pollution. Three factors of variability were defined (years, localities and individual trees) which affected the analysed characters of quantity and quality of seeds. We have found a significant influence of years and localities on the variability of evaluated parameters - seed weight and seed germination appeared to be the most stable characters less influenced by years and localities. The results of this study confirmed Pinus nigra Arnold possessed remarkable flexibility, showing tolerance to environmental conditions of urban sites and to a great extent also ability of generative reproduction in an environment contamined by heavy metals.