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    Assessment of atmospheric concentrations, gas/particle partitioning, cancer risks, sources, and atmospheric transport of PCDD/Fs in a suburban area of Bursa, Turkiye
    (Pergamon-Elsevier Science Ltd, 2025) Gulegen, Berke; Noori, Abdul Alim; Cindoruk, Sabahattin Siddik; Bigril, Askin; Ozer, Elif Tumay; Tasdemir, Yucel
    Polychlorinated dibenzo-p-dioxins/furans (PCDD/Fs) are a very high-priority air pollutant group as they pose serious threats to human and environmental health. Most of the PCDD/F research studies have been carried out in urban and industrial areas where these pollutants are expected to be in high concentrations. There are few studies conducted in suburban areas worldwide, especially in T & uuml;rkiye. In this study, a sampling campaign covering 12 months (June 2022-June 2023) was conducted in a suburban area in Bursa, T & uuml;rkiye, to address this gap. The total average concentration was found to be 22.6 +/- 3.21 fg I-TEQ/m(3). This value was found to be comparable to the results reported for suburban and rural areas worldwide. The influence of the seasonal effect on concentrations was seen as a strong negative correlation (r = -0.84, p < 0.001) was observed between total concentration values and temperature. A negative correlation was found between low chlorinated congener gas phase concentrations and inverse ambient temperature using Clausius-Clapeyron. In the study, the performance of 7 different gas/particle partitioning models was evaluated. It was aimed to investigate the factors affecting the gas/particle partitioning of PCDD/Fs by using models based on different parameters. According to their performance, the models were ranked as Harner-Bidleman approximate to Dachs-Eisenreich > Li-Ma-Yang > Junge-Pankow approximate to pp-LFER > QSPR > mp-pp-LFER. Principal Component Analysis (PCA) showed that the main pollutant source in the region is traffic emissions. Back trajectory analysis indicated that air masses were transported to the sampling point from the organized industrial zones. Calculated cancer risk values revealed that there would be no significant risk due to inhalation of PCDD/Fs in the area.
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    Evaluation of the concentrations of current use pesticides (CUPs) in urban air and rainfall, and their wet deposition flux in a metropolitan environment
    (Elsevier B.V., 2025) Birgul, Askin; Yavuz-Guzel, Evsen; Da?lio?lu, Nebile; Taşdemir, Yücel; Cindoruk, Sabahattin Siddik; Kurt-Karakus, Perihan Binnur
    This study assesses the wet deposition fluxes and washout ratios of current-use pesticides (CUPs) in Bursa, Turkey, to better understand their environmental impact. It investigates the temporal and spatial fluctuations of these compounds, particularly focusing on CUPs like benomyl, dichlorvos, dimethoate, imidacloprid, monochrotophos, and pymetrozine. The concentrations of CUPs in both ambient air and precipitation showed seasonal variations, with peaks in spring and summer due to increased agricultural activities. Precipitation concentrations of CUPs also varied, when the detection rates based on CUP congeners are analyzed, benomyl (70 %) and pymetrozine (66 %) are the most frequently detected congeners in the collected samples, particularly during the peak agricultural season. Wet deposition fluxes were highest in spring and summer, while dry deposition fluxes peaked in autumn and winter. Benomyl, dichlorvos, dimethoate, and imidacloprid were determined the most abundant CUP congeners in both phase (gas and particle phase). The dry deposition velocities ranged from 0.001 to 2.26 cm/s, and washout ratios varied between 1.35 × 10?4 and 1.18 × 10?6, depending on the CUP congeners. These findings underscore the need for ongoing monitoring, enhanced measurement techniques, and interdisciplinary collaboration to better understand CUP distribution and its environmental and health impacts, while developing effective management strategies. © 2025 Elsevier B.V.