Environmental Pollution最新文献

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Huge challenges of improving ozone pollution in China: high regional background ozone concentrations calculated from observational data
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-28 DOI: 10.1016/j.envpol.2025.126162
Yusi Liu, Yang Zhang, Fan Yang, Linlin Liang, Guiqian Tang
{"title":"Huge challenges of improving ozone pollution in China: high regional background ozone concentrations calculated from observational data","authors":"Yusi Liu, Yang Zhang, Fan Yang, Linlin Liang, Guiqian Tang","doi":"10.1016/j.envpol.2025.126162","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126162","url":null,"abstract":"Understanding current regional background ozone concentrations can clarify their ability to meet air quality standards. In this study, the regional background ozone concentration was defined as the stable concentration of ozone caused by large-scale winds. Therefore, on the basis of an experimental equation, the national regional background ozone concentration was calculated via national hourly ozone concentration and wind speed observational data from 2015 to 2023. This study divided China into five regions according to the spatial distributions of climatic zones and regional background ozone concentrations. The regional background ozone concentration in China was low in the northeast (77.3 ± 5.7 μg/m<sup>3</sup>) and southeast monsoon (79.3 ± 5.2 μg/m<sup>3</sup>) regions and high in the southwest monsoon region (94.5 ± 8.0 μg/m<sup>3</sup>) and northern region (95.3 ± 7.1 μg/m<sup>3</sup>). The regional background concentration of the plateau region was considered high at the national level (99.6 ± 4.8 μg/m<sup>3</sup>). This study highlights that the regional background ozone concentration in plains is related to soil NOx, and that that in plateaus is related to altitude (stratospheric intrusion and strong radiation). Cross-border transport from Southeast Asia contributed significantly to regional background ozone in Southwest China. Given the differences in regional background ozone concentrations, the ability to meet national air quality standards varies across regions. The plateau, northern, and southwest monsoon regions presented high regional background ozone concentrations, which indicates that these regions are under great pressure to reduce emissions.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"13 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Epidemiological and genomic insights of mcr-1-positive colistin-resistant Klebsiella pneumoniae species complex strains from wastewater treatment plants in Shanghai
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-28 DOI: 10.1016/j.envpol.2025.126146
Min Jia, Jing Zhang, Jun Feng, Yuan Zhuang, Zhen Xu, Lingyue Yuan, Jiayuan Luo, Liang Hong, Jiahui Xia, Huanyu Wu, Xin Chen, Min Chen
{"title":"Epidemiological and genomic insights of mcr-1-positive colistin-resistant Klebsiella pneumoniae species complex strains from wastewater treatment plants in Shanghai","authors":"Min Jia, Jing Zhang, Jun Feng, Yuan Zhuang, Zhen Xu, Lingyue Yuan, Jiayuan Luo, Liang Hong, Jiahui Xia, Huanyu Wu, Xin Chen, Min Chen","doi":"10.1016/j.envpol.2025.126146","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126146","url":null,"abstract":"The emergence of <em>mcr-1</em>-positive <em>Klebsiella pneumoniae</em> species complex (MP-KpSC) poses a significant threat to public health due to its resistance to last-resort antibiotics like colistin. This study aimed to investigate the prevalence, genomic characteristics, and transmission features of MP-KpSC in wastewater treatment plants (WWTPs) in Shanghai, China. A total of 13 (0.36%) MP-KpSC isolates were identified, including 12 <em>K. pneumoniae</em> and 1 <em>K. quasipneumoniae subsp. similipneumoniae</em> (Kqps). Nine multidrug-resistant (MDR) MP-KpSC and 3 extensively drug-resistant (XDR) MP-KpSC strains were identified. Twenty-two resistance determinants were present in over 30% of the strains, with the most prevalent being <em>mcr-1</em> (100%), <em>floR</em> (84.62%), <em>mphA</em> (69.23%), and <em>tet(A)</em> (69.23%). MP-KpSC exhibited 11 sequence types, 4 plasmid types, 6 <em>mcr-1</em>-flanked regions, 4 clonal groups, and diverse serotypes. In 53.85% of strains, transposons were identified within the <em>mcr-1</em>-flanked regions. One strain contained both <em>mcr-8.2</em> and <em>mcr-1</em> gene. Notably, the <em>mcr-1</em> gene was identified for the first time in Kqps and was located on the conjugative IncP1 plasmid, with <em>ISApl1</em> elements upstream of it. Worryingly, two carbapenem- and colistin-resistant XDR MP-KpSC stains, and three possible hypervirulence (hv) were found in MDR MP-KpSC strains. Moreover, multiple virulence genes and <em>mcr-1</em>, on the same contig with IS679 insert element. The evolutionary trajectories of these strains among WWTPs-clinical-animals were revealed in Shanghai. The study highlights the environmental reservoir of MP-KpSC in WWTPs and the potential risk of XDR and hv MP-KpSC transmission to humans and aquatic animals, and underscores the importance of active surveillance in WWTPs to curb the spread of MP-KpSC.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"183 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Competitive interactions among the rare earth metals (lanthanum, cerium, and yttrium) lead to quantitative decreases in biouptake by Chlamydomonas reinhardtii
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-28 DOI: 10.1016/j.envpol.2025.126170
Laurianne Pagé, Marie-Hélène Brunet, Kevin J. Wilkinson
{"title":"Competitive interactions among the rare earth metals (lanthanum, cerium, and yttrium) lead to quantitative decreases in biouptake by Chlamydomonas reinhardtii","authors":"Laurianne Pagé, Marie-Hélène Brunet, Kevin J. Wilkinson","doi":"10.1016/j.envpol.2025.126170","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126170","url":null,"abstract":"With increasing mining and production of the rare earth elements (REE), it is important to quantify their potential environmental impacts. The objective of this study was to quantitatively relate REE biouptake to exposure under carefully controlled laboratory conditions. Internalization fluxes of three REE cations (La<sup>3+</sup>, Ce<sup>3+</sup>, and Y<sup>3+</sup>) were measured at environmentally relevant concentrations (10<sup>-9</sup> – 5x10<sup>-6</sup> M) in order to determine the stability constants of their interaction with biological uptake sites in <em>Chlamydomonas reinhardtii</em> (logK<sub>La</sub> = 7.9 M<sup>-1</sup>; logK<sub>Ce</sub> = 7.6 M<sup>-1</sup>; logK<sub>Y</sub> = 7.8 M<sup>-1</sup>). Biouptake for cation pairs and ternary metal mixtures confirmed a competitive (antagonistic) interaction among the three REE that was well predicted using constants from the single metal experiments, indicating that the REE shared a common uptake site. Competition for Ca<sup>2+</sup> and Mg<sup>2+</sup> was also quantified, and while less important than for the REE, the constants (logK<sub>Ca</sub> = 4.7 M<sup>-1</sup>; logK<sub>Mg</sub> = 3.8 M<sup>-1</sup>) indicated that water hardness will nearly completely reduce biouptake and effects of the REE for environmentally relevant concentrations of the hardness ions (e.g. biouptake reduced by ∼78% for a [Ca]/[REE] of 10<sup>4</sup> and ∼97% for [Ca]/[REE] of 10<sup>5</sup>).","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"36 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Spatial Variation of Resuspended Particulate Matter in Urban Environments and Real-World Assessment of Street Sweeping
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-28 DOI: 10.1016/j.envpol.2025.126165
Cheol-Heon Jeong, Cuilian Fang, Greg Evans
{"title":"Spatial Variation of Resuspended Particulate Matter in Urban Environments and Real-World Assessment of Street Sweeping","authors":"Cheol-Heon Jeong, Cuilian Fang, Greg Evans","doi":"10.1016/j.envpol.2025.126165","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126165","url":null,"abstract":"Non-tailpipe emissions have gained growing attention as an emerging source of traffic-related air pollution, especially as tailpipe emissions decline. This study conducted extensive mobile measurements in a high-density urban area over two years to investigate the spatial variability of resuspended road dust and evaluate the real-world effectiveness of street sweeping. Resuspended particulate matter (PM), specifically PM<sub>2.5</sub> and PM<sub>10</sub>, was measured alongside pollutants from tailpipe and non-tailpipe sources. The mobile sampling revealed substantial spatial variability in resuspended PM with notably higher concentrations on local streets compared to major roads. This spatial pattern contrasted with tailpipe-related black carbon and ultrafine particles, which were elevated near highways, commercial, and industrial zones. Nearby construction and renovation activities were major contributors to resuspended PM on local streets. As a result, school neighborhoods in residential areas and open spaces may experience acute exposure to road dust PM.Street sweepers equipped with regenerative air systems were generally ineffective in reducing resuspended PM under real-world conditions. This trend was consistent across different types of regenerative sweepers and operational modes, except for one sweeper equipped with an advanced filtration system showing some reduction in resuspended PM. Operational factors, including sweeper speed and water spraying, substantially influenced PM resuspension. While water spraying reduced on-road PM during sweeping, excessive use resulted in unintended increases in both resuspended and on-road PM concentrations afterward. While street sweeping helps to manage debris on road surfaces, these findings underscore the need to optimize sweeping practices and develop strategies to improve near-road air quality.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"36 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Tracing emerging contaminants from the Baltic Sea and North Sea in fjord waters in southern Norway with rare earth elements as far-field tracers
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-27 DOI: 10.1016/j.envpol.2025.126124
Anna-Lena Zocher, Tomasz Maciej Ciesielski, Stefania Piarulli, Julia Farkas, Michael Bau
{"title":"Tracing emerging contaminants from the Baltic Sea and North Sea in fjord waters in southern Norway with rare earth elements as far-field tracers","authors":"Anna-Lena Zocher, Tomasz Maciej Ciesielski, Stefania Piarulli, Julia Farkas, Michael Bau","doi":"10.1016/j.envpol.2025.126124","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126124","url":null,"abstract":"Knowledge of geogenic and anthropogenic rare earth elements and yttrium (REY) in fjords in Norway and elsewhere is still limited despite the importance of fjords for biodiversity and economy and the known ecotoxicity of the REY. We provide complete sets of REY data for fjord waters and a river in southern Norway and for several stations along the coasts of Denmark and Sweden, which characterise Baltic Sea outflow water.Shallow fjord waters show high REY concentrations and shale-normalised (<sub>SN</sub>) patterns that resemble those of the river water input. Deeper waters show lower concentrations, seawater-like REY<sub>SN</sub> patterns, and the Pr<sub>SN</sub>/Tb<sub>SN</sub> ratios (≥ 0.5) typical of fjord waters. Some of the samples show elevated Gd/Tb ratios and distinct positive Gd anomalies, revealing the presence of anthropogenic Gd originating from constrast agents used in magnetic resonance imaging (MRI).We emphasise that <em>all</em> water samples from the Baltic Sea outflow taken over a twelve months period show large positive Gd anomalies, suggesting permanent input of anthropogenic Gd from the Baltic Sea into the Skagerrak. Combined with literature data, our results suggest that the anthropogenic Gd in the fjords of southern Norway is not derived from local sources. It rather originates from the Baltic Sea and southern North Sea and is transported northward by currents along the coasts of Sweden, Denmark and Germany. If application of Gd-based contrast agents in MRI continues to increase, this signal will get stronger in the future and be transported even further north.Overall, our data for geogenic REY and anthropogenic Gd in fjord and bay waters from southern Norway and in the Baltic Sea outflow show that local hydrography exerts an important control on the concentration and distribution of trace elements which may be (micro)nutrients and/or (micro)pollutants in fjords and needs to be considered in environmental impact studies.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"36 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Factors influencing the vertical distribution and transport of plastics in riverine environments: Theoretical background and implications for improved field study design
IF 7.6 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-27 DOI: 10.1016/j.envpol.2025.126151
Jenna Brooks, Julia Hopkins
{"title":"Factors influencing the vertical distribution and transport of plastics in riverine environments: Theoretical background and implications for improved field study design","authors":"Jenna Brooks,&nbsp;Julia Hopkins","doi":"10.1016/j.envpol.2025.126151","DOIUrl":"10.1016/j.envpol.2025.126151","url":null,"abstract":"<div><div>Rivers have been widely recognized as important conduits and accumulation sites for plastics. Accurately describing plastic fate and transport in these systems is essential for the development of numerical models, estimating loads to oceans, and implementing effective management strategies. However, plastic transport mechanisms within fluvial environments are not well understood, and field studies often do not provide sufficient information to test analytical models of transport. Sediment transport has dynamical similarities to plastics transport in water bodies, enough to warrant further investigation into how principles from sediment transport can be used to guide the study of plastics. In this review, we summarize fundamentals from sediment transport research and their application to plastics, then use these to make suggestions of clarifying research questions and riverine field study design with the goal of generating more insightful data that can be used to understand and predict plastic fate and transport. We focus specifically on factors influencing plastic vertical distribution and movement in the water column, as variations in this direction have historically been overlooked or oversimplified in rivers.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"373 ","pages":"Article 126151"},"PeriodicalIF":7.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Uncovering the Partitioning, Transport Flux and Socioeconomic Factors of Organophosphate Esters in an Urban Estuary of Eastern China
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-27 DOI: 10.1016/j.envpol.2025.126132
Ya Yang, Lai Wei, Rui Wang, Guohua Zhao, Shouye Yang, Haifeng Cheng, Hualin Wu, Qinghui Huang
{"title":"Uncovering the Partitioning, Transport Flux and Socioeconomic Factors of Organophosphate Esters in an Urban Estuary of Eastern China","authors":"Ya Yang, Lai Wei, Rui Wang, Guohua Zhao, Shouye Yang, Haifeng Cheng, Hualin Wu, Qinghui Huang","doi":"10.1016/j.envpol.2025.126132","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126132","url":null,"abstract":"The Yangtze River Estuary is considered as a critical transition zone for terrestrial organophosphate esters (OPEs) transported to the open sea, yet their environmental behavior and influencing drivers remain inadequately investigated. Here, we examine the occurrence of eleven OPEs across water, suspended particulate matter (SPM), and sediment, which reveals moderate pollution levels compared to other Chinese estuaries. The OPE partitioning processes are dependent on compound-specific partition coefficients (LogK<sub>d</sub>), hydraulic factors, and terrestrial input. Compounds with lower logK<sub>ow</sub> remain mostly dissolved or particulate-bound, whereas higher logK<sub>ow</sub> OPEs tend to be deposited in sediment. Riverine input and output emerge as the dominant transport pathways for OPEs within the YRE, with an annual input flux of 677 tons. Modeling reveals that tris(1-chloro-2-propyl) phosphate (TCIPP), tris(2-chloroethyl) phosphate (TCEP), and triethyl phosphate (TEP) face significant resuspension risks, indicating their increased transport into the open sea, while tris(2-ethylhexyl) phosphate (TEHP) presents a remarkable sedimentary risk due to its high hydrophobicity. The results suggest that the YRE functions as a source for resuspension-prone compounds and a sink for sediment-bound OPEs, demonstrating their distinct environmental fates. Additionally, aggravating pollution of OPEs has been observed in the Pearl River, Yellow River, and Yangtze River Estuaries with sustained wastewater discharge and rapid urbanization. This study provides an overview of the partitioning processes, transport mechanisms, and anthropogenic threats, thus underlining the need for effective pollution mitigation to protect estuarine ecosystems and promote sustainable water management.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"36 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Characterization and risk-quantification of antibiotic resistome in grain-based and non-grain cropping soils
IF 7.6 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-27 DOI: 10.1016/j.envpol.2025.126147
Jingpeng Li , Lin Zhu , Xiaodi Li , Xuezhu Han , Jiaming Yi , Ying Wu , Meizhen Wang
{"title":"Characterization and risk-quantification of antibiotic resistome in grain-based and non-grain cropping soils","authors":"Jingpeng Li ,&nbsp;Lin Zhu ,&nbsp;Xiaodi Li ,&nbsp;Xuezhu Han ,&nbsp;Jiaming Yi ,&nbsp;Ying Wu ,&nbsp;Meizhen Wang","doi":"10.1016/j.envpol.2025.126147","DOIUrl":"10.1016/j.envpol.2025.126147","url":null,"abstract":"<div><div>Microbial contamination in soils, encompassing human bacterial pathogens (HBPs), antibiotic resistance genes (ARGs), and virulence factor genes (VFGs), poses a significant threat to human health via the food chain. Currently, there is a lack of comprehensive assessments of microbial contamination and associated health risks of ARGs in agricultural soils. In this study, metagenomic sequencing was used to evaluate microbial contamination in grain-based cropping soils (rice cultivation) and non-grain cropping soils (vegetable cultivation and aquaculture). The results showed that the diversity and abundance of HBPs and VFGs were significantly higher in non-grain soils. Further resistome analysis revealed higher abundances of high-risk (from 0.014 to 0.018–0.023) and “last-resort” ARGs (from 0.007 to 0.034–0.046) in non-grain soils. Besides ARGs abundance, health risk quantification revealed that non-grain soils exhibited 1.49–2.14-fold greater ARG-related risks than grain-based soils. Additionally, stronger network associations were found between HBPs, ARGs, and mobile genetic elements (MGEs) in non-grain soils. This study indicated that the non-grain cropping pattern of soils elevated the risk of microbial contamination and ARGs health risk, which provided an important basis for accurately quantifying the risk of microbial contamination in different agricultural soils.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"373 ","pages":"Article 126147"},"PeriodicalIF":7.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Unraveling the Impact of Micro- and Nano-sized Polymethyl methacrylate on Gut Microbiota and Liver Lipid Metabolism: Insights from Oral Exposure Studies
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-27 DOI: 10.1016/j.envpol.2025.126157
Peng Chen Zheng, Xin Qiang Pan, Yi Jiong Zhou, Keng Po Lai, Rong Li, Xiao Xi Zhang
{"title":"Unraveling the Impact of Micro- and Nano-sized Polymethyl methacrylate on Gut Microbiota and Liver Lipid Metabolism: Insights from Oral Exposure Studies","authors":"Peng Chen Zheng, Xin Qiang Pan, Yi Jiong Zhou, Keng Po Lai, Rong Li, Xiao Xi Zhang","doi":"10.1016/j.envpol.2025.126157","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126157","url":null,"abstract":"Microplastics, particularly polymethyl methacrylate (PMMA), have emerged as significant environmental pollutants, with growing concerns about their impact on various biological processes. However, the effects of chronic PMMA exposure on hepatic lipid metabolism remain insufficiently studied. This research aimed to examine the consequences of chronic exposure to PMMA particles of different sizes (100 nm and 2 μm) on hepatic lipid metabolism in mice. Female C57BL/6J mice were administered PMMA particles in drinking water over an 8-week period, and the effects on intestinal and liver morphology and function were evaluated. Histopathological analyses, gut microbiota profiling, and serum and liver assays were conducted to assess oxidative stress, lipid metabolism-related biomarkers, and liver metabolomics. The results revealed that PMMA particles accumulated in both the liver and colon, causing liver injury characterized by elevated ALT and AST levels. The exposure also induced oxidative stress by inhibiting the NRF2/HO-1 signaling pathway. Furthermore, PMMA exposure resulted in significant alterations to the gut microbiota and hepatic metabolism. These changes were linked to increased microbial diversity, which impacted cholesterol metabolism through the gut-liver axis. Additionally, the activation of the PI3K/AKT/PPARγ signaling pathway disrupted hepatic lipid metabolism, leading to increased cholesterol synthesis and hepatic lipid accumulation. This study underscores the potential of PMMA to disrupt both hepatic lipid metabolism and gut microbiota composition, suggesting a novel mechanism by which PMMA exposure could contribute to metabolic disorders and liver disease.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"37 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
Distribution Characteristics of Volatile Organic Compounds and Its Multidimensional Impact on Ozone Formation in Arid Regions Based on Machine Learning Algorithms
IF 8.9 2区 环境科学与生态学
Environmental Pollution Pub Date : 2025-03-27 DOI: 10.1016/j.envpol.2025.126159
GuangYao Shi, HuiHui Du, LingTong Du, XiLu Ni, Yang Hu, DanBo Pang, LiangJin Yao
{"title":"Distribution Characteristics of Volatile Organic Compounds and Its Multidimensional Impact on Ozone Formation in Arid Regions Based on Machine Learning Algorithms","authors":"GuangYao Shi, HuiHui Du, LingTong Du, XiLu Ni, Yang Hu, DanBo Pang, LiangJin Yao","doi":"10.1016/j.envpol.2025.126159","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126159","url":null,"abstract":"Volatile Organic Compounds (VOCs) are key components of atmospheric pollution and play a critical role in ozone (O<sub>3</sub>) formation. Understanding their distribution and pollution sources is essential to grasping the multifaceted impact of VOCs on O<sub>3</sub> production. This study, conducted at the Yinchuan Urban Ecosystem Research Station, carried out simultaneous field observations to collect data on VOCs, meteorological factors, and O<sub>3</sub>. Machine learning algorithms were employed to analyze the sources of VOCs pollution and evaluate their impact on O<sub>3</sub> formation. Results show that the monthly average volume fraction of total VOCs was 29.28×10<sup>-9</sup>, with alkanes dominating, accounting for 51.1% of total VOCs during summer at high altitudes. Ethane (3.55×10<sup>-9</sup>), n-hexane (3.36×10<sup>-9</sup>), and propane (2.85×10<sup>-9</sup>) were identified as key components. Artificial source contributed 78.6% of VOCs emissions in summer, with hydrocarbon volatile emission source (31.6%) and vehicle emission source (30.1%) being the major sources, while natural emissions accounted for only 21.4%. VOCs exhibited a notable negative impact on O<sub>3</sub> levels, reflected by a total effect value of -0.29. Among the VOCs components, aromatics, halocarbons, and alkanes were identified as the primary contributors to O<sub>3</sub> dynamics, with respective effect values of 0.84, 0.75, and 0.71, and their contribution rates were quantified as 21.8%, 19.4%, and 18.4%, respectively. Among meteorological factors, temperature was a key determinant of O<sub>3</sub> levels, with a significant positive effect (effect value of 0.58). Temperature, wind speed, and relative humidity primarily influenced O<sub>3</sub> through direct effects, while photosynthetically active radiation indirectly influenced O<sub>3</sub> by affecting VOCs. The findings of this study link pollution sources, meteorological factors, and air quality management. Through systematic multidimensional analysis, it offers deeper insights into the complex relationships between meteorological factors, VOCs, and O<sub>3</sub> in high-altitude areas. These insights provide a scientific basis for formulating precise, region-specific, and component-targeted air pollution control measures.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"48 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
引用次数: 0
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