Environmental Pollution最新文献

{"title":"Protective Masks Reduced Gastrointestinal Risks of Antibiotic-Resistant E. coli for Hospital Wastewater Treatment Plant Workers: A Quantitative Microbial Risk Assessment","authors":"Thammanitchpol Denpetkul, Thitima Srathongneam, Oranoot Sittipunsakda, Sajjamarn Tancharoen, Prachote Krabkran, Skorn Mongkolsuk, Kwanrawee Sirikanchana","doi":"10.1016/j.envpol.2025.126180","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126180","url":null,"abstract":"Antibiotic-resistant bacteria (ARB) in hospital wastewater present significant but under-researched risks for wastewater treatment plant (WWTP) workers. This study evaluated annual infection risks (<em>P</em>_<em>y</em>) from exposure to ESBL-producing <em>Escherichia coli</em> (ESBL <em>E. coli</em>) and the effectiveness of protective masks. Wastewater samples from 25 hospitals in Thailand revealed 88% of untreated samples were positive for ESBL <em>E. coli</em> (6.25 × 10² to 1.83 × 10⁷ CFU/100 mL, mean 2.22 × 10⁶), while 40% of treated samples tested positive (1.00 × 10² to 1.97 × 10⁵ CFU/100 mL, mean 2.45 × 10⁴). Using quantitative microbial risk assessment and data from 917 workers, risks were calculated under three scenarios: non-resistant, antibiotic-resistant, and highly virulent <em>E. coli</em>. Ingestion of aerosols and droplets posed a higher infection risk than hand-to-mouth contact, with <em>P</em>_<em>y</em> often exceeding the U.S. EPA benchmark of 10^-4 per person per year. Mask use, particularly surgical and FFP2 masks, significantly reduced risks, bringing treated wastewater exposure below the benchmark. However, highly virulent <em>E. coli</em> risks remained high across all mask types. These findings highlight the need for effective protective measures and disinfection strategies to safeguard WWTP workers and mitigate ARB dissemination, protecting public health and environmental safety.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"34 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766610","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}

{"title":"Microplastics in the deep: suspended particles affect the model species Mytilus galloprovincialis under hyperbaric conditions","authors":"Marlene Pinheiro, Clara Lopes, Nélson Alves, Eunice Almeida, Hugo Morais, Marta Ribeiro, Susana Barros, Joana Raimundo, Miguel Caetano, Teresa Neuparth, Miguel M. Santos","doi":"10.1016/j.envpol.2025.126195","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126195","url":null,"abstract":"Microplastics (MPs) are small plastic particles that result from the degradation of bigger fragments or introduced into the environment as primary particles. Their reduced size makes them available for ingestion by marine organisms, particularly in subtidal and deep-sea environments, which represent the largest sinks for MPs in the ocean. However, there is a lack of data regarding the effects of MPs in subtidal and deep-sea ecosystems. Thus, the present study aimed to assess the effects of MPs under hyperbaric conditions. Juvenile mussels, <em>Mytilus galloprovincialis</em>, were exposed to three concentrations of polyethylene MPs: 0.1, 1 and 10 mg/L, in a mixture of sizes (38-45, 75-90 and 180-212 μm), at different pressures: 1, 4 and 50 Bar, for 96 h. After exposure, the filtration rate, biochemical markers of oxidative stress and transcriptomic profile were analyzed to assess the effects of MPs. Results indicate that MPs affected functional endpoints, with a significant decrease in the filtration rate of mussels exposed to MPs at 1 mg/L and higher. Similarly, all tested oxidative stress biomarkers were affected in a treatment, concentration and pressure-dependent manner. RNA-seq analysis performed in organisms exposed to 1mg/L of MPs at 4 Bar identified several affected signaling pathways (430 differentially expressed genes) including cellular senescence, the MAPK, RAS PI3K-Akt signaling pathways, apoptosis, among others. Overall, the results here presented corroborate the hypothesis that MPs affect exposed organisms under short-term hyperbaric conditions. These findings highlight the need to study MPs effects in subtidal and deep-sea <em>taxa</em> and address, in future studies, combined effects with other stressors such as contaminants that might be sorbed to the surface of the particles. These findings also indicate that improving hazard assessment of MPs under hyperbaric conditions is paramount to support risk assessment and the implementation of mitigation strategies.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"57 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766908","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}

{"title":"Emission of CO2 enhanced by thiamethoxam and cadmium in agricultural soil","authors":"Zaiming Ge, Xiaoxia Lu, Shuai Zhang, Lijin Yi","doi":"10.1016/j.envpol.2025.126190","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126190","url":null,"abstract":"The coexistence of neonicotinoid insecticide thiamethoxam (TMX) and heavy metal cadmium (Cd) is quite common in agricultural soils, yet their effects on the emission of greenhouse gas CO₂ remain insufficiently studied. To address this issue, microcosms spiked with singe or combined TMX (20 mg/kg) and Cd (20 mg/kg) in soil were studied for 90 days. It turned out that single TMX (+12.13%) and Cd (+22.76%) both stimulated the emission of CO₂, and the combined TMX and Cd exhibited synergic effect (+51.00%). The presence of Cd reduced the attenuation of TMX (-3.32%), while the presence of TMX increased the attenuation of Cd (+3.11%). The relative abundances of bacteria <em>Sphingomonas</em>, <em>Devosia</em>, <em>Erythrobacter</em>, <em>Phaselicystis</em>, <em>Woeseia</em>, <em>FFCH7168</em>, <em>Rhizorhapis</em>, <em>Hamadaea</em> and genes related to sugar metabolism, glycolysis and the TCA cycle were found positively correlated to CO₂ emission in the studied microcosms (<em>p</em>&lt;0.05). Results from this study provide scientific basis for developing sound environmental policies that aim to reduce CO₂ emission from agricultural soils.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"183 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766914","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}

{"title":"Interaction and sorption mechanisms of phthalate plasticizers and Cd2+ on biochar","authors":"Wenjie Li, Jian Wang, Xuwen Chen, Ahmed Mosa, Wanting Ling, Yanzheng Gao","doi":"10.1016/j.envpol.2025.126176","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126176","url":null,"abstract":"Biochar exhibits significant potential for the remediation of soil contaminated with organic pollutants and heavy metals. A comprehensive understanding of the interfacial interactions and sorption mechanisms of low-hydrophobicity phthalate plasticizers, such as dimethyl phthalate (DMP) and diethyl phthalate (DEP), along with Cd²⁺ on biochar, is essential for the effective remediation of polluted soil environments. This study systematically examines the interaction and sorption mechanisms of PAEs-Cd²⁺ on biochar at both macro and micro levels using sorption batch experiments and molecular dynamics simulations. The sorption of contaminants by biochar occurred through a combination of physical and chemical mechanisms. The presence of coexisting pollutants reduced the sorption capacity of biochar to PAEs but had a minimal effect on Cd²⁺ adsorption. In the co-sorption system, PAEs and Cd²⁺ demonstrated distinct interaction behaviors. Due to its smaller molecular size and higher diffusion coefficient, Cd²⁺ readily bonded to surface sorption sites on biochar and infiltrated its pores. Although PAE-ion complexes enhanced the sorption of pollutants by biochar, PAE molecules, and cluster structures primarily accumulated on the biochar surface, interacting with heavy metals through electrostatic forces. This interaction reduced the contribution of pore filling to pollutant sorption and weakened the desorption hysteresis capacity of biochar. The intraparticle diffusion model had similar results. Thus, a larger specific surface area and an abundant pore structure are crucial factors in improving the co-sorption capacity of biochar. This study offers novel insights into the sorption behavior of PAEs and Cd²⁺ on biochar within organic-inorganic composite pollution.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"62 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766607","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}

{"title":"Atmospheric microplastics deposition in a central Indian city: Distribution, characteristics and seasonal variations","authors":"Archana Prajapati, Pradip Jadhao, Asirvatham Ramesh Kumar","doi":"10.1016/j.envpol.2025.126183","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126183","url":null,"abstract":"Atmospheric microplastics (AMPs) transport and deposition in urban areas contribute to microplastics pollution. The present study investigates AMPs deposition, characteristics, potential sources, and the influence of meteorological factors in a central Indian city. AMPs were collected over three land-use types, <em>viz.</em> institutional, commercial, and industrial areas, during four seasons: summer, monsoon, autumn, and winter. The deposition flux of microplastics ranged from 212.53 ± 52.32 to 543.25 ± 71.23 particles/m²/day. The AMPs were predominantly fibres (87.84 %), followed by films (5.43 %), with particle size &lt;1000 μm contributed 43.67 %. The predominant polymer types identified were polyethylene terephthalate (PET, 37.39 %), nylon (20.49 %), and polypropylene (PP, 10.27 %). Higher deposition fluxes were recorded in summer, with 491.06 ± 73.37 particles/m²/day. Correlation analysis revealed a negative correlation between rainfall and AMPs deposition, suggesting a potential cleaning role of rainfall. The estimated annual deposition flux of AMPs in Nagpur city was 3.22 × 10¹³ particles. Higher AMPs deposition was attributed to plastic waste littering, industrial emissions, and textiles. The estimated mean annual inhalation exposures of AMPs of size 50 – 250 μm for children and adults were 7375.84 ± 1312.89 and 3738.17 ± 665.39 MPs/ kg-bw/year, respectively. The findings of this study contribute to understanding the fate of AMPs and its implications for human exposure. The findings underscore the importance of reducing and managing plastic waste.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"37 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766911","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}

{"title":"In vitro effects of aged low-density polyethylene micro(nano)plastic particles on human airway epithelial cells","authors":"Agnė Vailionytė, Ieva Uogintė, Justina Pajarskienė, Edvardas Bagdonas, Tadas Jelinskas, Ilja Ignatjev, Steigvilė Byčenkienė, Rūta Aldonytė","doi":"10.1016/j.envpol.2025.126186","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126186","url":null,"abstract":"Airborne micro(nano)plastic (MNP) pollution has emerged as a major global concern due to its increasingly worrying adverse health effects. Environmental weathering and UV irradiation of plastic waste, together with tire wear, generate airborne MNPs with irregular shapes and varied sizes, with low-density polyethylene (LDPE) being the predominant plastic type. However, knowledge of MNPs’ toxicological effects remains scarce, as current <em>in vitro</em> research mainly focuses on commercial polystyrene beads. In this study, we investigated for the first time the toxicological effects of environmentally relevant aged LDPE MNPs on human bronchial epithelial cells (BEAS-2B). UV-aged LDPE fragments of irregular sizes and shapes were used to mimic real atmospheric particles, and BEAS-2B cells were exposed to 10–1000 μg/cm² of LDPE MNPs. Our results showed that MNPs were internalized by BEAS-2B cells and promoted epithelial-to-mesenchymal transition (EMT), characterized by reduced β-catenin and increased vimentin expression, enhanced motility, and disturbed cell cycle. Moreover, exposure to aged LDPE MNPs significantly increased intracellular ROS levels and reduced cell proliferation rate at the highest dose. LDPE MNPs triggered oxidative stress in BEAS-2B cells through activation of the NRF2 signaling pathway, with impaired autophagic flux indicated by increased expression of p62 and LC3A/B. Importantly, LDPE MNP exposure significantly increased the secretion of pro-inflammatory mediators (CD62E, CD62P, ICAM-1, IL-6, IL-8), accompanied by suppressive effects on mitochondrial respiration and glycolytic function at 1000 μg/cm². Taken together, our findings suggest that inhalation of LDPE MNPs could impact the morphology and function of the human airway epithelium and respiratory health in general.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"21 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766913","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}

{"title":"Spatiotemporal evolution and risk thresholds of PM2.5 components in China from the human health perspective","authors":"Haifeng Xu, Wenhui Luo, Chen Dai, Shijie Zhao, Rui Qian, Bing Dong, Zhengqiang Li, Jinji Ma","doi":"10.1016/j.envpol.2025.126194","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126194","url":null,"abstract":"PM_2.5 is a significant global public health hazard, with its components closely linked to various fatal diseases, thereby significantly increasing mortality rates. This study analysed the spatiotemporal evolution of PM_2.5-related mortality and death rates in China using risk attribution methods based on PM_2.5-component and population data. The study used a LightGBM model based on Bayesian and SHAP algorithms to identify the concentration thresholds at which the components of PM_2.5 affect mortality. The results showed that from 2001 to 2022, the mortality rates influenced by the five PM_2.5 components showed a consistent downward trend, decreasing by 101,000–529,000, with a mean annual decrease of 2.2–4.6%. The relative importance of organic matter (OM), nitrate (NO₃^-) and ammonium (NH₄⁺) in influencing mortality increased by 6.3, 17.4 and 4% respectively, while the relative importance of black carbon (BC) and sulphate (SO₄^2-) in influencing mortality decreased rapidly to approximately 2%. The contribution of OM and SO₄^2- to mortality exceeded 30%, with thresholds of 8.6–10.3 and 9.6–10.5 μg/m³, respectively. The thresholds for the effects of NO₃^-, NH₄⁺, and BC on mortality were 6.8–9.4, 3.4–6, and 1.8–3.5 μg/m³, respectively. This study provides effective insights for policymakers to help formulate targeted air pollution control measures and optimise public health interventions to support human health and sustainable societal development.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"34 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766603","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}

{"title":"Microplastics from cigarette filters: comparative effects on selected terrestrial and aquatic invertebrates","authors":"Andraž Dolar, Branka Mušič, Tina Skalar, Gregor Marolt, Damjana Drobne, Andrijana Sever Škapin, Anita Jemec Kokalj","doi":"10.1016/j.envpol.2025.126199","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126199","url":null,"abstract":"Cigarette filters comprise plasticised cellulose acetate, a synthetic polymer categorized as bioplastic. They represent a significant source of microplastics (MPs), in particular microfibers, and associated chemicals, yet their impact on organisms, especially soil invertebrates, is not well-studied. This research examines the effects of MPs milled from smoked (SCF-MPs) and unsmoked cigarette filters (UCF-MPs) on terrestrial invertebrates (<em>Porcellio scaber, Tenebrio molitor</em>) and aquatic invertebrates (<em>Daphnia magna, Brachionus calyciflorus</em>). SCF-MPs and UCF-MPs were found to be 9.06 ± 4.1 μm and 12.71 ± 6.82 μm in size, respectively. Both samples contained triacetin and potentially toxic metals, while SCF-MPs also contained nicotine and a larger number of trace organic compounds. While exposure to SCF-MPs or UCF-MPs (up to 1.5% MPs, w/w in soil) did not affect the survival of either terrestrial invertebrate, several physiological responses were observed. These included changes in immune parameters, energy-related biomarker levels, and altered glutathione S-transferase and acetylcholinesterase activities. Both types of MPs were acutely toxic to aquatic invertebrates, reducing the survival rates of <em>B. calyciflorus</em> (10 mg L^-1 of either particle after 48h exposure) and <em>D. magna</em> (100 mg L^-1 of SCF-MPs after 48h exposure). SCF-MPs generally caused more pronounced effects than UCF-MPs. This study highlights the need for effective environmental management to address both smoked and unsmoked cigarette filters.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"8 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766604","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}

{"title":"From Input to Transformation: Investigating the Dynamic Evolution of Volatile Organic Compounds and Driving Mechanisms During Sandstorms","authors":"LinZhen Wang, GuangYao Shi, HuiHui Du, JinSong Zhang, LiangJin Yao, LingTong Du, XiLu Ni, Yang Hu, DanBo Pang","doi":"10.1016/j.envpol.2025.126192","DOIUrl":"https://doi.org/10.1016/j.envpol.2025.126192","url":null,"abstract":"Sandstorms are frequent natural phenomena in arid and semi-arid regions, with significant impacts on air quality and ecological systems. Volatile organic compounds (VOCs) demonstrate high photochemical reactivity and a strong tendency to form secondary pollutants during sandstorm events. However, the mechanisms governing their interactions with dust particles remain poorly understood. This study was conducted using synchronous observations at the Yinchuan Urban Ecosystem Positioning Station in Ningxia, where data on meteorological parameters, atmospheric pollutants, and VOCs were collected across different dust storm stages. By integrating Positive Matrix Factorization and Structural Equation Model, we systematically examined the dynamic evolution of VOCs, pollution sources, and their driving mechanisms during dust storm events. Results showed that during sandstorm period, the total VOCs concentration declined from 36.14 × 10^-9 (pre-sandstorm period) to 20.76 × 10^-9, then gradually increased to 23.58 × 10^-9 (post-sandstorm period). The primary contributors to VOCs included alkanes and oxygenated VOCs. Sandstorm inputs altered the VOCs component ratios, with the most pronounced reduction observed in low-reactivity alkanes. In the pre-sandstorm period, VOCs primarily originated from industrial activities and motor vehicle emissions, contributing 28% and 23%, respectively. During the sandstorm and post-sandstorm period, solvent sources and motor vehicle emissions emerged as the primary sources of VOCs. Meteorological factors, such as wind speed, primarily exerted a dilution effect on VOCs, whereas temperature and humidity promoted VOCs generation in the post-sandstorm period. During the sandstorm period, dust particles mainly diluted VOCs concentrations, whereas in the post-sandstorm period, they contributed to increased VOCs levels by facilitating secondary pollutant formation. This study enhances the theoretical understanding of compound pollution formation during sandstorm events and provides scientific guidance for regional pollution control strategies.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"37 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766608","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}

{"title":"Spatiotemporal variations of dissolved nitrous oxide concentrations in small water bodies in a typical urban landscape in eastern China","authors":"Xuebing Chen ,&nbsp;Yuye Shen ,&nbsp;Yihong Liu ,&nbsp;Fangfang Zhang ,&nbsp;Linlin Tian ,&nbsp;Jing Wang ,&nbsp;Yanjiang Cai ,&nbsp;Yan Li ,&nbsp;Scott X. Chang","doi":"10.1016/j.envpol.2025.126173","DOIUrl":"10.1016/j.envpol.2025.126173","url":null,"abstract":"<div><div>Waters in urban landscape are susceptible to nitrogen (N) pollution, potentially leading to supersaturation of dissolved nitrous oxide (N₂O) and making them a source of atmospheric N₂O. However, the spatiotemporal variations and driving factors of dissolved N₂O concentrations in these waters remain unclear. This study examined the spatiotemporal variations of dissolved N₂O in an interconnected river-lake system in a subtropical urban landscape. The annual mean dissolved N₂O concentration was 0.81 μg N L⁻¹, with a mean N₂O saturation of 304 %, indicating the system could act as a N₂O emitter. Under the influence of daily fluctuations in water temperature and DO, the diurnal variation of N₂O was most pronounced in autumn, with the smallest amplitude observed in winter. Seasonal mean concentrations of dissolved N₂O, N, phosphorus (P), chlorophyll-a (Chl-a) and dissolved oxygen (DO) peaked in winter and were lowest in summer. The central lake had significantly lower dissolved N₂O, N and P concentrations, but possessed higher water temperature, pH, concentrations of Chl-a and DO than its upstream and downstream rivers. Dissolved N₂O concentrations were positively correlated with concentrations of N and P, but negatively with pH, Chl-a, and DO. There was intensifying competition for N between the N₂O producers and algae, particularly in summer or in the central lake area. Therefore, the spatiotemporal variations of dissolved N₂O concentrations were primarily driven by the integrated effects of seasonal conditions, nutrient fluctuations and algal growth. This research can provide essential scientific guidance for developing the effective strategies to control N pollution and mitigate the risk of N₂O emissions from water bodies in urban landscape.</div></div>","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"373 ","pages":"Article 126173"},"PeriodicalIF":7.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745702","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}