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.

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

Numerous studies have reported that particulate matter and its specific chemical constituents were linked to the incidence of respiratory diseases and mortality and lung function. The main aim of this study is to determine metallic content in PM10 and PM2.5 samples taken simultaneously at several locations in the close vicinity of the copper smelter in Bor and the influence of outdoor PM pollution on indoor PM levels. The measurement campaign was conducted, during the non-heating season of 2020. PM samples were collected at all sampling sites with low-volume samplers (Sven/Leckel LVS3) on quartz fiber filters (Whatman QMA, 47mm). All samples were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP MS). In this way, the mass concentrations of 4 priority elements (As, Cd, Pb, and Ni) in PM samples were identified and quantified. It has been determined that average indoor PM levels in the laboratory were higher than outdoors. A strong correlation was found between PM10 and PM2.5 particle levels inside the laboratory and in the outdoor air. Also, a very strong correlation was found between the levels of Pb, Ni, As, and Cd determined in PM10 and PM2.5 samples inside the laboratory and in the outdoor air. This confirms that mentioned elements originate from the same sources located in the copper smelter complex.