ToxicsPub Date : 2025-06-20DOI: 10.3390/toxics13070518
Stela Stoyanova, Elenka Georgieva, Eleonora Kovacheva, László Antal, Dóra Somogyi, Ifeanyi Emmanuel Uzochukwu, László Nagy, Krisztián Nyeste, Vesela Yancheva
{"title":"Kidneys Under Siege: Pesticides Impact Renal Health in the Freshwater Fish Common Carp (<i>Cyprinus carpio</i> Linnaeus, 1758).","authors":"Stela Stoyanova, Elenka Georgieva, Eleonora Kovacheva, László Antal, Dóra Somogyi, Ifeanyi Emmanuel Uzochukwu, László Nagy, Krisztián Nyeste, Vesela Yancheva","doi":"10.3390/toxics13070518","DOIUrl":"https://doi.org/10.3390/toxics13070518","url":null,"abstract":"<p><p>This study evaluated the histopathological impact of three commonly used pesticides-pirimiphos-methyl, propamocarb hydrochloride, and 2,4-dichlorophenoxyacetic acid (2,4-D)-on the kidneys of common carp (<i>Cyprinus carpio</i> Linnaeus, 1758) after 96-h acute exposure. The histopathological analysis demonstrated that all three tested pesticides induced structural changes. The histopathological changes were assessed using a semi-quantitative scoring system and categorised into circulatory, degenerative, proliferative, and inflammatory alterations. While circulatory alterations were absent in all treatments, clear and statistically significant degenerative, proliferative, and inflammatory responses were recorded, which escalated with increasing pesticide concentrations. Additionally, various statistical analyses were conducted to evaluate the lesions in kidney structure and function. Before the statistical analysis, normality and variance homogeneity were assessed using the Shapiro-Wilk and Levene's tests, respectively. Due to non-normal data distribution, non-parametric methods were applied. Hence, the non-parametric statistical methods showed distinct group-level differences in the kidney damage indices. The Kruskal-Wallis test revealed significant differences across treatments (<i>p</i> < 0.001), and Mann-Whitney U tests identified specific pairwise differences. The degenerative and proliferative lesions were most prominent in fish exposed to 2,4-D at 100 µg/L (IK = 34), followed by pirimiphos-methyl and propamocarb hydrochloride. Inflammatory changes were mainly observed in the pirimiphos-methyl groups. The histopathological lesions were concentration-dependent, with 2,4-D causing irreversible renal damage at higher concentrations. These findings highlight the nephrotoxic risks posed by common pesticides and validate that the use of histopathological indices, combined with robust non-parametric testing, provides a reliable approach to evaluating organ-specific pesticide toxicity. These biomarkers offer sensitive early warning indicators of environmental risk, reinforcing the suitability of common carp as a model species for ecotoxicological assessment.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144708929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Occurrence, Migration Behavior, and Environmental Burden of Phthalate Esters in Flooring Materials Used in Newly Renovated Chinese Homes.","authors":"Ying Zhang, Li-Bo Chen, Hao-Yang Shen, Zi-Chao Wu, Ning-Zheng Zhu, Chong-Jing Gao, Ying Guo","doi":"10.3390/toxics13070517","DOIUrl":"https://doi.org/10.3390/toxics13070517","url":null,"abstract":"<p><p>Phthalic acid esters (PAEs), a class of synthetic semi-volatile organic compounds, are extensively incorporated into decorative materials. However, their specific occurrence, migration behaviors, and environmental impact on these materials-which comprise the largest surface areas in residential settings-remain insufficiently understood. This study investigated the distribution, emission dynamics, and environmental burdens of PAEs in flooring commonly used in Chinese households. The results showed that PAEs are widespread in flooring, with total concentrations ranging from 1220 to 166,000 ng/g (14,100 ng/g, median value). Solid wood flooring (55,900 ng/g) exhibited significantly higher PAE levels compared to engineered flooring (22,600 ng/g) and laminate flooring (4000 ng/g) (<i>p</i> < 0.05). Migration experiments revealed that solid wood flooring tended to continuously release PAEs, laminate flooring showed a pronounced capacity for PAE absorption, and engineered flooring exhibited both release and absorption behaviors. The initial PAE concentration is the dominant factor influencing migration rates, while the flooring type and substrate density also contribute to varying degrees. The estimated environmental burdens of PAEs resulting from flooring in newly renovated Chinese households ranged from 3.63 × 10<sup>9</sup> ng to 3.45 × 10<sup>11</sup> ng, with a median value of 1.23 × 10<sup>10</sup> ng. Households in the eastern and southwestern regions exhibited the highest PAE burdens, while the southern region showed the lowest. Socioeconomic factors such as residential floor area, number of rooms, household income, and renovation budget significantly influenced the environmental burden of PAEs derived from flooring.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 7","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144708883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ToxicsPub Date : 2025-06-19DOI: 10.3390/toxics13060513
Masafumi Nakamura, Ryo Matsuda, Hoa Thi Vu, Tai Pham-The, Thao Ngoc Pham, Tomoya Takiguchi, Hisao Nishijo, Muneko Nishijo
{"title":"Bioassay Using the DR-EcoScreen System to Measure Dioxin-Related Compounds in Serum Samples from Individuals Exposed to Dioxins Originating from Agent Orange in Vietnam.","authors":"Masafumi Nakamura, Ryo Matsuda, Hoa Thi Vu, Tai Pham-The, Thao Ngoc Pham, Tomoya Takiguchi, Hisao Nishijo, Muneko Nishijo","doi":"10.3390/toxics13060513","DOIUrl":"10.3390/toxics13060513","url":null,"abstract":"<p><p>A bioassay for dioxin analysis of human samples has the advantages of cost effectiveness and requiring only a small sample volume. Using a DR-EcoScreen bioassay, we measured the biological equivalency (BEQ) levels in serum samples from 32 men exposed to dioxins in Bien Hoa and 32 unexposed men in Hanoi, Vietnam. For the Bien Hoa men, the World Health Organization toxic equivalent (WHO-TEQ) levels of dioxins had already been measured by instrumental analysis. The difference in fat-based BEQ levels between exposed and unexposed men was greater than for crude BEQ levels, with a strong correlation between fat-based BEQ and WHO-TEQ levels. The fat-based BEQ levels in Bien Hoa men with longer residency but lower WHO-TEQ levels were significantly higher than those in unexposed men and Bien Hoa men with shorter residency but higher WHO-TEQs, suggesting that fat-based BEQ may be an effective marker of dioxin-like activity. Additionally, comparisons of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and TEQs between shorter- and longer-residency groups indicated that higher levels of polychlorinated dibenzo-p-dioxins (PCDDs), particularly TCDD, contribute to increased BEQ levels. Taken together, the DR-EcoScreen bioassay may be useful to analyze dioxin-like activity associated with WHO-TEQs of men in a dioxin contamination hotspot originating from Agent Orange in Vietnam.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197712/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Hydrochemical Characteristics, Controlling Factors, and High Nitrate Hazards of Shallow Groundwater in an Urban Area of Southwestern China.","authors":"Chang Yang, Si Chen, Jianhui Dong, Yunhui Zhang, Yangshuang Wang, Wulue Kang, Xingjun Zhang, Yuanyi Liang, Dunkai Fu, Yuting Yan, Shiming Yang","doi":"10.3390/toxics13060516","DOIUrl":"10.3390/toxics13060516","url":null,"abstract":"<p><p>Groundwater nitrate (NO<sub>3</sub><sup>-</sup>) contamination has emerged as a critical global environmental issue, posing serious human health risks. This study systematically investigated the hydrochemical processes, sources of NO<sub>3</sub><sup>-</sup> pollution, the impact of land use on NO<sub>3</sub><sup>-</sup> pollution, and drinking water safety in an urban area of southwestern China. Thirty-one groundwater samples were collected and analyzed for major hydrochemical parameters and dual isotopic composition of NO<sub>3</sub><sup>-</sup> (δ<sup>15</sup>N-NO<sub>3</sub><sup>-</sup> and δ<sup>18</sup>O-NO<sub>3</sub><sup>-</sup>). The groundwater samples were characterized by neutral to slightly alkaline nature, and were dominated by the Ca-HCO<sub>3</sub> type. Hydrochemical analysis revealed that water-rock interactions, including carbonate dissolution, silicate weathering, and cation exchange, were the primary natural processes controlling hydrochemistry. Additionally, anthropogenic influences have significantly altered NO<sub>3</sub><sup>-</sup> concentration. A total of 19.35% of the samples exceeded the Chinese guideline limit of 20 mg/L for NO<sub>3</sub><sup>-</sup>. Isotopic evidence suggested that primary sources of NO<sub>3</sub><sup>-</sup> in groundwater include NH<sub>4</sub><sup>+</sup>-based fertilizer, soil organic nitrogen, sewage, and manure. Spatial distribution maps indicated that the spatial distribution of NO<sub>3</sub><sup>-</sup> concentration correlated strongly with land use types. Elevated NO<sub>3</sub><sup>-</sup> levels were observed in areas dominated by agriculture and artificial surfaces, while lower concentrations were associated with grass-covered ridge areas. The unabsorbed NH<sub>4</sub><sup>+</sup> from nitrogen fertilizer entered groundwater along with precipitation and irrigation water infiltration. The direct discharge of domestic sewage and improper disposal of livestock manure contributed substantially to NO<sub>3</sub><sup>-</sup> pollution. The nitrogen fixation capacity of the grassland ecosystem led to a relatively low NO<sub>3</sub><sup>-</sup> concentration in the ridge region. Despite elevated NO<sub>3</sub><sup>-</sup> and F<sup>-</sup> concentrations, the entropy weighted water quality index (EWQI) indicated that all groundwater samples were suitable for drinking. This study provides valuable insights into NO<sub>3</sub><sup>-</sup> source identification and hydrochemical processes across varying land-use types.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197245/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Integrated Deterministic and Probabilistic Methods Reveal Heavy Metal-Induced Health Risks in Guizhou, China.","authors":"Qinju Li, Dashuan Li, Zelan Wang, Dali Sun, Ting Zhang, Qinghai Zhang","doi":"10.3390/toxics13060515","DOIUrl":"10.3390/toxics13060515","url":null,"abstract":"<p><p>Due to high geological background and intensive mining activities, soils are prone to heavy metals (HMs) accumulation and ecological fragility in Guizhou Province, China. A total of 740 topsoil samples were therefore collected, and aimed to determine the concentrations of As, Cd, Cr, Hg, and Pb, estimate the ecological pollution, and evaluate the carcinogenic and non-carcinogenic health risks to humans. Results showed As (1.08%) and Cd (24.46%) in soil exceeded standards. The Igeo showed that Cr (1.49%) and Hg (31.62%) in soil were at light pollution levels; single factor pollution index (PI) showed that Cd (21.35%) in soil was mildly polluted; risk index (RI) as at a low risk level. Notably, both deterministic and Monte Carlo analyses revealed unacceptable carcinogenic risks for As and Cr in children, with traditional methods potentially underestimating As risks. Moreover, Target-Organ Toxicity Dose (TTD) revealed soil HMs as a higher risk to hematological health, with notable health risks posed by Pb in children. It is noted that spatial distribution analysis suggested that the southwestern region of Guizhou Province should be prioritized for health risk management and control. By integrating the uniqueness of geological environments, multi-dimensional health risk assessments, and spatial distributions, the present study provides a scientific basis for assessing HMs pollution risks and soil health risks in the karst regions.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197724/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ToxicsPub Date : 2025-06-19DOI: 10.3390/toxics13060514
Benedicte Hauquiert, Aurelien Gonze, Thibault Gennart, Emily Perriens, Sydney Blackman, Nathan De Lissnyder, Arnaud Robert, Julien Moury, Gauthier Nendumba, Ilann Oueslati, Priscilla Gillis, Ovidiu Vornicu, Anne-Sophie Dincq, Pierre Bulpa, Isabelle Michaux, Patrick M Honore
{"title":"Nephrotoxicity and Modern Volatile Anesthetics: A Narrative Review.","authors":"Benedicte Hauquiert, Aurelien Gonze, Thibault Gennart, Emily Perriens, Sydney Blackman, Nathan De Lissnyder, Arnaud Robert, Julien Moury, Gauthier Nendumba, Ilann Oueslati, Priscilla Gillis, Ovidiu Vornicu, Anne-Sophie Dincq, Pierre Bulpa, Isabelle Michaux, Patrick M Honore","doi":"10.3390/toxics13060514","DOIUrl":"10.3390/toxics13060514","url":null,"abstract":"<p><p>Volatile anesthetics, while increasingly utilized in intensive care medicine, are associated with significant renal adverse effects. A critical safety concern-particularly with sevoflurane-involves its potential impact on renal function. Pathophysiologically, inorganic fluoride levels exceeding 50 µmol/L are recognized as a threshold for nephrogenic diabetes insipidus, a condition generally considered reversible. Additionally, the sevoflurane degradation product \"compound A\" has been implicated in direct renal tubular and glomerular toxicity. Specifically, exposure has been correlated with glomerular damage, evidenced by albuminuria, as well as injury to both proximal and distal tubules, indicated by elevated levels of α-glutathione-S-transferase. Postprandial glycosuria may also be observed. Unlike nephrogenic diabetes insipidus, the structural damage induced by compound A may result in irreversible renal impairment.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197702/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ToxicsPub Date : 2025-06-18DOI: 10.3390/toxics13060512
Maolan Zhang, Xuanran Luo, Maocai Jiang, Yu Wen, Peng Wang, Peixing Chen, Da Sun
{"title":"The Development and Toxicological Evaluation of Novel Polyurethane Materials.","authors":"Maolan Zhang, Xuanran Luo, Maocai Jiang, Yu Wen, Peng Wang, Peixing Chen, Da Sun","doi":"10.3390/toxics13060512","DOIUrl":"10.3390/toxics13060512","url":null,"abstract":"<p><p>Polyurethane (PU) is widely employed in the biomedical field. As application scenarios become increasingly complex, it is essential to modify PU to meet diverse requirements. Additionally, the degradation of PU is closely linked to the sustainability of its function, with degradation products having a direct impact on adjacent tissues. In this study, a novel PU containing double bonds in its main chain was developed. We investigated the influence of various ratios of soft segment composition on the degradation performance of PU, maintaining a fixed ratio of soft to hard segments and utilizing specific synthesis methods. The structure and molecular weight of the PU were analyzed using FTIR, NMR, and GPC techniques. The results of physical and chemical performance tests indicated that an increase in polycaprolactone diol (PCL diol) content within the soft segment enhanced the mechanical properties, hydrophobicity, and degradation performance of the PU. A further assessment of the degradation toxicity of PU was carried out using zebrafish as a model organism. The findings indicated that the degradation solution of PU exhibited slight toxicity to zebrafish embryonic development over prolonged degradation periods. However, it also significantly enhanced the hatching of zebrafish embryos. In summary, the novel PU developed in this study demonstrates favorable biocompatibility, and the approach of introducing reaction sites or modifying the composition of its soft segments within the molecular structure offers a promising and effective strategy to address specific application requirements.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197236/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ToxicsPub Date : 2025-06-18DOI: 10.3390/toxics13060510
Giorgio Maria Baldini, Dario Lot, Daniele Ferri, Luigi Montano, Mario Valerio Tartagni, Antonio Malvasi, Antonio Simone Laganà, Mario Palumbo, Domenico Baldini, Giuseppe Trojano
{"title":"Does Electromagnetic Pollution in the ART Laboratory Affect Sperm Quality? A Cross-Sectional Observational Study.","authors":"Giorgio Maria Baldini, Dario Lot, Daniele Ferri, Luigi Montano, Mario Valerio Tartagni, Antonio Malvasi, Antonio Simone Laganà, Mario Palumbo, Domenico Baldini, Giuseppe Trojano","doi":"10.3390/toxics13060510","DOIUrl":"10.3390/toxics13060510","url":null,"abstract":"<p><p>In recent decades, exposure to electromagnetic fields (EMFs) generated by standard devices has raised concerns about possible effects on reproductive health. This cross-sectional observational study examined the impact of EMFs on sperm motility in a sample of 102 healthy males aged 20-35 years in the IVF laboratory. Semen samples were exposed to different sources of EMF for one hour, and motility was assessed immediately thereafter. The results showed a significant reduction in progressive sperm motility after exposure to EMFs generated by mobile phones and Wi-Fi repeaters in the laboratory. In contrast, other equipment showed no significant effects. The study demonstrated a statistically significant reduction in progressive sperm motility following in vitro exposure to electromagnetic fields (EMFs) emitted by mobile communication devices and wireless local area network access points. Conversely, other electromagnetic emitting devices evaluated did not elicit significant alterations in this parameter. These findings suggest a potential negative impact of specific EMF sources on semen quality, underscoring the necessity for further comprehensive research to elucidate the clinical implications and to develop potential mitigation strategies aimed at reducing risks to male reproductive health. This study discourages the introduction of mobile phones in IVF laboratories and recommends positioning Wi-Fi repeaters on the ceiling.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197507/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ToxicsPub Date : 2025-06-18DOI: 10.3390/toxics13060511
Nelmarie Landrau-Giovannetti, Ryanne Murray, Stephen Reichley, Debra Moore, Theresa Madrigal, Ashli Brown, Ashley Meredith, Christina Childers, Darrell Sparks, Moby Solangi, Anna Linhoss, Beth Peterman, Mark Lawrence, Barbara L F Kaplan
{"title":"Tissue Element Levels and Heavy Metal Burdens in Bottlenose Dolphins That Stranded in the Mississippi Sound Surrounding the 2019 Unusual Mortality Event.","authors":"Nelmarie Landrau-Giovannetti, Ryanne Murray, Stephen Reichley, Debra Moore, Theresa Madrigal, Ashli Brown, Ashley Meredith, Christina Childers, Darrell Sparks, Moby Solangi, Anna Linhoss, Beth Peterman, Mark Lawrence, Barbara L F Kaplan","doi":"10.3390/toxics13060511","DOIUrl":"10.3390/toxics13060511","url":null,"abstract":"<p><p>In 2019, an unusual mortality event (UME) affected bottlenose dolphins (<i>Tursiops truncatus</i>) in the Mississippi Sound (MSS) following an extended dual opening of the Bonnet Carré Spillway (BCS), which prevents flooding in New Orleans. This resulted in low salinity, skin lesions, and electrolyte imbalances in dolphins. Additionally, the influx likely altered the MSS's environmental chemical composition, including levels of heavy metals and metalloids; thus, we quantified heavy metals, metalloids, and essential elements in the tissues of dolphins that stranded in the MSS before and after the 2019 UME. We hypothesized that levels of heavy metals and metalloids (such as mercury (Hg), arsenic (As), lead (Pb), and cadmium (Cd)) would not show significant changes post-UME. Indeed, we found no major changes associated with the UME in most metals; sodium (Na) and magnesium (Mg) levels were lower in several tissues after 2019, which correlated with the average yearly salinity measured from the MSS. Toxic metals and metalloids were detectable with some changes over time; however, the selenium (Se):Hg molar ratio increased in some tissues post-2019. Additionally, we confirmed that Hg can bioaccumulate, with positive correlations between Hg levels and dolphin size as assessed by straight length. Overall, our findings indicate that freshwater incursions into the MSS can alter dolphin exposure to essential and toxic elements.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197444/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Urban-Rural Differences in Indoor and Outdoor Air Quality: A Comparative Study in Bangladesh.","authors":"Masamitsu Kurata, Akira Hibiki, Kazushi Takahashi, Yutaka Matsumi","doi":"10.3390/toxics13060509","DOIUrl":"10.3390/toxics13060509","url":null,"abstract":"<p><p>Health hazards caused by indoor air pollution (IAP) remain a global concern, especially in developing countries. IAP has complex mechanisms related to outdoor air pollution (OAP) and various other factors, and their relationship needs to be clarified to examine effective policies. We conducted an indoor and outdoor air monitoring survey in urban, peri-urban, and rural areas in Bangladesh, one of the countries with the most severe air pollution. The results show that IAP is more severe in urban households than in rural households, with a five-fold difference in daily indoor PM2.5 concentration between 117 μg/m3 and 22 μg/m3, respectively. Regression analysis reveals that IAP is strongly associated with OAP and is hardly affected by solid fuels used in well-ventilated outside kitchens. Our findings support the view that the mitigation of IAP in developing countries can be achieved not only through a transition to clean fuels, which often entails substantial costs, but also through more practical and accessible alternatives, such as the use of outdoor kitchens, electric fans, and careful management of behaviors such as indoor smoking and mosquito coil use.</p>","PeriodicalId":23195,"journal":{"name":"Toxics","volume":"13 6","pages":""},"PeriodicalIF":3.9,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12197357/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144485990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}