No abstract

The concentrations of four cancerogenic elements (Pb, Cd, Ni, and As) determined in PM10 at three locations in the urban areas near the copper smelter in Bor (Serbia) were analyzed in the period from January 2017 to May 2020. The aim of this research was to examine the correlations between the selected elements and to compare them with those obtained previously. The reason for this is the fact that the new copper smelter started operating in Bor in 2016. The results presented here showed that the average content of As in PM10 was over the annual national limit at all sampling points for the total period of observation, as well the contents of Cd in PM10 at the sampling point Jugopetrol. The content of Pb in PM10 was over the annual limit only at sampling point Jugoperol. The correlations between the As-Pb, As-Cd, and Cd-Pb, at all sampling points, mostly vary from very strong (r>0.8) and strong (0.8>r>0.6) to moderate (0.6>r>0.4). Also, compared to previously obtained results, these correlations are generally stronger. Such results indicate that As, Cd, and Pb determined in PM10 mostly originate from the same source, the copper smelter in Bor. Opposite to that, correlations of Ni with other selected elements are mostly very weak (r<0.2) to moderate. This shows that Ni mostly originated from natural sources.

History as an occurrence in the past can be researched if we have the appropriate historical sources available.Archives facilitate the work of historians by organizing and processing archival material. The historical research, almost without exception, begins with consulting and studying archival materials.In the State Archives of the Republic of North Macedonia in Skopje, there are two files relating to Milivoj Trbich, a member of the Ravna Gora Movement.The first file is the Trbich’s dossier, which was compiled by the State Security Service of the Socialist Republic of Macedonia. The dossier was a result of the successfully completed operation of the Administration of State Security to find and arrest Trbich on January 16, 1947. The dossier consists of 56 documents, 11 photographs and two materials with propaganda content of the Ravna Gora Movement in Macedonia. Most of the documents were prepared by the Administration of State Security of the People’s Republic of Macedonia.The second file is the dossier that was created as a result of the conducted court trial against Trbich and against five other persons from June 11 to June 13, 1947. The court trial was held in the District Court in Skopje. This dossier contains 119 documents. The majority of the documents have a judicial content.The two dossiers represent two important sources for the study of the life and work of Trbich.

The paper presents the results of the research conducted on the rescue of the seven Allied (American) pilots in Macedonia (Poreče) by the Ravna Gora Movement. This event took place in August, 1944. The paper is composed of several parts: analysis of the sources used the rescue of the pilots and the elaboration of the letter written on the 26 th of June 1945 by one of the seven rescued pilots.

This paper presents the PM10 and PM2.5 concentrations and results of chemical analyses of PM samples collected at the public library in Bor town, Serbia. Two sampling campaigns were carried out during six consecutive working days in June 2015 and in March 2016. The results show that PM10 and PM2.5 concentrations in the library were strongly connected with the respective PM concentrations in ambient air. So, most PM particles in the library originate from the outdoor air. High PM2.5/PM10 ratios in both indoor and outdoor environments indicate the considerable influence of anthropogenic air pollution sources, in this case, metallurgical processes in copper smelting plants. Because the new copper smelting plant started operating in 2016, it is necessary to conduct a new measurement campaign to determine whether there are changes in the concentration levels and chemical composition of PM in the indoor air of public and residential buildings in Bor