National systems of automatic air quality monitoring are based on automatic measuring instruments that are installed in stationary air quality monitoring stations. Substantial financial resources are required for the procurement, installation, calibration, and maintenance of such measuring devices. For this reason, existing national and local air quality monitoring networks are not able to provide a high temporal and spatial resolution of measurement results. In the last decade, as a possible alternative to the conventional approach to air quality monitoring, real-time monitoring systems using low-cost sensors and sensor plat-forms have begun to be applied. This paper describes the basic characteristics of a portable air quality monitor PAQMAN 2020 based on low-cost sensors. Part of the results of comparative measurements of this device with the reference instruments is presented in the paper.

The European initiatives for citizens? inclusion in the air quality monitoring process have impacted the participants? knowledge, and attitudes towards air pollution and have led to a higher sense of community toward activities and measures against air pollution. In the Republic of Serbia, an experiment with self-made sensor kits "Klimerko ? Air to the Citizens" started in 2018. In this paper, we have presented the level of agreement of the particulate matter (PM) readings from selected Klimerko devices to the PM readings of the reference equivalent PM monitors from the National Air Quality Monitoring Network in the cities of Bor and Belgrade. The Klimerko devices that we tested showed excellent stability and reliability during the comparison period. The conclusion of our investigation is that the properly calibrated Klimerko devices could be applied for indicative measurements of PM mass concentrations in the ambient air.

Fire testing is critical for assessing the behavior of building materials under fire conditions, providing indispensable insights into important variables such as flammability, heat release rate, and smoke production. This paper provides an overview of common fire testing methods, including the procedures for test selection, sample preparation, data collection, and analysis. These fire testing methods are outlined in standards issued by world-respected standardization bodies such as ISO, EN, ASTM, and UL. These standards guarantee and ensure the consistency and reliability of prescribed methods. Moreover, this paper presents a detailed description of a custom-made installation hosted at the Fire Protection Laboratory at the Faculty of Occupational Safety, University of Niš, used for evaluating the flammability parameters of a broad spectrum of materials. This hyphenated installation, comprising a mass loss calorimeter and an FTIR gas analyzer, can be used for comprehensive and simultaneous real-time measurement of flammability parameters and fire effluent analysis.

This research investigates the spatial distribution and clustering patterns of wildland fires in Serbia from January 2013 to December 2023 using data obtained from NASA's Fire Information for Resource Management System (FIRMS). A total of 69,179 fires are mapped using the Visible Infrared Imaging Radiometer Suite (VIIRS) 375 m thermal anomalies/active fire product, which offers improved spatial resolution and mapping capabilities. Spatial autocorrelation analysis, particularly Moran's I and Local Moran's I, is applied to assess the degree of clustering in the wildland fire incident dataset. Results indicate significant spatial patterns, highlighting critical areas for fire management and prevention. Municipalities such as Požarevac, Bogatić, Kikinda, Žitište, Sečanj, Šid, Irig, Ruma, and Stara Pazova, identified as HH clusters, should be prioritized for resource allocation. LH clusters, including Grocka, Beočin, and Velika Plana, need integration into regional strategies. Additionally, the persistent HL cluster in Kosjerić indicates an anomaly requiring focused intervention. These insights provide valuable information for targeted fire management strategies and highlight the importance of spatial analysis in understanding wildfire dynamics.

The spillages due to collisions related incidents involving the wagon tankers, which carrying hazardous materials (hazmat), can be followed by fires or explosions, presents a severe threat to the safety of residents and nearby buildings. In this study, ALOHA and PHAST was used to evaluate the level of thermal radiation at different distances from the place of accident. Discussed scenario analyze a leakage of kerosene from a tanker wagon, from different opening diameters, where is formed a pool fire. As an assumption for location of possible accident, parts of the railway where it can be expected a large number of people and vehicles were taken. For study area was chosen city of Niš, Serbia.

The subjective experience of the environment where people live defines the comfort of that environment. The elements of environmental comfort are the air quality, thermal comfort, visual comfort, and sound comfort. The air quality in the room where people stay can significantly affect their concentration, i.e., the ability to work and study. The concentration of CO 2 in the room is used as an indicator of ventilation, that is, as an indicator of the air quality in the observed room. The thermal comfort defines a state of satisfaction with the thermal environment. The thermal comfort is achieved when the environment properties are such that they ensure the release of BAKAR 48 (2023) 1 COPPER body heat within the comfortable limits. This paper presents a part of the air quality and thermal comfort measurement results in the selected office in the Mining and Metallurgy Institute Bor from 2020 to 2022. Based on the analysis of measurement results, it was determined that the air quality in the selected office was satisfactory on an average of more than 90% of the working time, and the thermal comfort on an average of about 60% of the working time.