The purpose of the article is to assess on the basis of comparison of legislations on environmental protection, the sustainable development which has also been emphasized in Slovenia in the past few years. The currently effective legal regulatons in Slovenia in the field of environmental protection were compared with the EU standards and the standards and regulations of the WHO. The air and the waters as the most polluted landscape elements were chosen as the indicators of environmental quality. The comparison has revealed that the Slovenian regulations for waters are better coordinated with the EU directions; the Slovenian legislation is more demanding for the concentrations of heavy metals in the water (arsenic, cadmium). The Slovenian regulations for the air are also stricter for heavy metals (lead) but more tolerant for the remaining parameters (SO2, NOx, CO, O3). Therefore, the most urgent changes in this field of Slovenian environmental protection legislation will have to be done just now when Slovenia is in the period of adapting to and joining the EU members. However, this means a thorough of legislation which will certainly not pass without shocks (Okoljska ..., 1998).