In 2024, the air quality in the city of Bor was classified as Category III, indicating polluted air, according to the Mining and Metallurgy Institute (MMI) Bor annual report. While the Krivelj and Metovnica measuring points recorded Category I air quality, signifying clean or slightly polluted air, the Oštrelj and Brezonik sites experienced excessive levels of PM 10, exceeding the daily limit value for more than 35 days. Despite meeting other air quality parameters, these sites were classified as Category III. The Institute site reported arsenic (As) concentrations in PM 10 samples that exceeded the annual target value (6.8 ng/m3 compared to 6 ng/m3). Similarly, the Town Park site showed elevated levels of arsenic and cadmium (Cd) in PM 10, with concentrations of 16.8 ng/m3 and 9.5 ng/m3, respectively, surpassing the target annual values. The Jugopetrol site was notably affected, with 77 days of PM 10 concentrations exceeding the daily limit, arsenic concentrations of 42.0 ng/m3, and cadmium concentrations of 19.8 ng/m3, both significantly above their respective target values. The overall air quality assessment for the Bor agglomeration in 2024 was determined based on the most polluted measuring site, resulting in a Category III classification, indicating polluted air. This highlights the need for continued monitoring and mitigation efforts to improve air quality in the region. The air quality in the city of Bor in 2024 is worse compared to 2023 due to higher concentrations of Cd in PM 10 samples measured at the Jugopetrol and Town Park monitoring sites, as well as a greater number of days exceeding the daily limit value for PM 10 concentrations. If domestic copper concentrates do not contain Cd in significant percentages the question arises: What kind of imported concentrates are being smelted in the Bor copper smelter in 2023 and 2024 to cause such high Cd concentrations in PM 10 samples.