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in mosses has declined the most for lead (77%), followed by vanadium (55%), cadmium 74 (51%), chromium (43%), zinc (34%), nickel (33%), iron (27%), arsenic (21%, since 75 1995), mercury (14%, since 1995) and copper (11%). Between 2005 and 2010, the 76 decline ranged from 6% for copper to 36% for lead; for nitrogen the decline was 5%.

For the first time the atmospheric deposition of trace metals was studied over the entire territory of the Republic of Macedonia. Samples of the terrestrial mosses Hypnum cupressiforme, Camptothecium lutescens, and Homalothecium sericeum were collected in September-October 2002 at 73 sites evenly distributed over the country, and a total of 43 elements were determined by instrumental neutron activation analysis and atomic absorption spectrometry. Principal component factor analysis was used to identify the most polluted areas and characterize different pollution sources. The most important sources of trace metal deposition are ferrous and non-ferrous smelters, oil refineries, fertilizer production plants, and central heating stations. Four areas appear to be particularly exposed to metal pollution: Veles, Skopje, Tetovo, and Kavadarci-Negotino, whereas the predominantly agricultural regions in the south, southwest, and southeast show levels closer to European median values for most elements of mainly pollution origin.