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The discovery of a new virus has forced many countries to introduce drastic measures at the beginning of the pandemic to protect human health. These measures include the reduced mobility of people and the reduction of certain economic activities. As a consequence, studies conducted in different countries have reported significant improvement in air quality. This paper aims to assess the impact of quarantine and lockdown measures on air quality in the city of Bor. Data regarding concentrations of PM10 and SO2 were collected using three monitoring stations located in the urban part of the city and compared with corresponding periods in 2019 and 2021. The results have shown that concentrations of these pollutants were even higher during the lockdown period. Concentrations of SO2 were 58 % higher compared to those in the corresponding period in 2019 and 56 % higher compared to those in 2021. The mean daily values of PM10 were 47 % higher compared to those in 2019 and 29 % higher compared to those in 2021. [ABSTRACT FROM AUTHOR]

This paper represents, for the first time, scientific data as a part of monitoring air quality in the city of Split. The city has a problem with the air pollution mostly caused by anthropogenic activities and partly by natural origin activities. This study presents results of monthly and seasonal variations of NO2, SO2 and black-smoke as well as the influence of meteorological parameters on observed concentration levels. Average seasonal values for SO2 ranged from 22.54 to 54.81 gg m-3, for NO2 from 48.24 to 56.38 gg m-3 and for black-smoke from 4.15 to 5.64/µg m-3. The results obtained for SO2 and black-smoke were below, while for NO2 were above the limit value of pollutants in the air recommended by Croatian Government (Air Protection Act (OG 178/04); Regulation on limit values of pollutants in air (OG 133/05)). As the result of stable meteorological conditions (high temperatures and drought), the increase in SO2 concentration was significant in summer period, while the concentrations of NO2 and black-smoke were not significantly changed during year and did not depend on other parameters. [ABSTRACT FROM AUTHOR]