[en] The combination of epithermal and conventional activation analysis on IBR-2 reactor, supplemented by atomic absorption spectrometry was determined 40 elements (Al, Ag, As, Au, Ba, Br, Ca, Cd, Ce, Cl, Co, Cr, Cs, Cu, Fe, Hf, Hg, 1, K, La, Lu, Mg, Mn, Mo, Na, Ni, Pb, Sb, Sc, Se, Sm, Ta, Tb, Th, U, V, W, Yb, Zn and Zr ,) of the periodic table in 86 sampling of mosses. To the best of our knowledge, such large associations of elements have never been studied before in environmental samples from Slovakia. The results of these investigations will be presented in the form of tables, diagrams, graphs and, using GIS (geographical information systems) technology, in the form of coloured contour maps for each element. Collected samples contained 3-year-old segments of mosses and it represented a deposition of heavy metals for the years 1998, 1999 and 2000. In this time an annually in Slovakia were totally emitted 47 t of arsenic, 11 t of cadmium, 9 t of chromium, 64 t of copper, 3,4 t of mercury, 35 t of nickel, 84 t of lead and 73 t of zinc. The region near the border between Slovakia, Poland and the Czech Republic is considered as the second 'black triangle' of Central Europe with substantially higher concentrations of heavy metals than the first 'black triangle' near the borders of the Czech Republic, Poland and Germany. Information about the air pollution status in different parts of the Slovakia is essential for a better understanding of environmental stresses. Bio-monitoring technique allows monitoring of atmospheric deposition of heavy metals with a very high spatial resolution. (authors)