Journal Description
Environments
Environments
is an international, peer-reviewed, open access journal on environmental sciences published monthly online by MDPI.
- Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
- High Visibility: indexed within Scopus, ESCI (Web of Science), PubAg, AGRIS, GeoRef, and other databases.
- Journal Rank: JCR - Q2 (Environmental Sciences) / CiteScore - Q1 (Ecology, Evolution, Behavior and Systematics)
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 22.8 days after submission; acceptance to publication is undertaken in 3.5 days (median values for papers published in this journal in the second half of 2024).
- Recognition of Reviewers: reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal, in appreciation of the work done.
- Testimonials: See what our editors and authors say about the Environments.
Impact Factor:
3.5 (2023);
5-Year Impact Factor:
3.5 (2023)
Latest Articles
Modeling Air Pollution in Metropolitan Lima: A Statistical and Artificial Neural Network Approach
Environments 2025, 12(6), 196; https://doi.org/10.3390/environments12060196 - 10 Jun 2025
Abstract
Particulate matter is a mixture of fine dust and tiny droplets of liquid suspended in the air. PM10 is a pollutant composed of particles smaller than 10 µm. These particles are harmful to the respiratory system. The air quality in the region
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Particulate matter is a mixture of fine dust and tiny droplets of liquid suspended in the air. PM10 is a pollutant composed of particles smaller than 10 µm. These particles are harmful to the respiratory system. The air quality in the region and capital Lima in the Republic of Peru has been investigated in recent years. In this context, statistical analyses of PM10 data with forecast models can contribute to planning actions that can improve air quality. The objective of this work is to perform a statistical analysis of the available PM10 data and evaluate the quality of time series classical models and neural networks for short-term forecasting. This study demonstrates that classical time series models, particularly ARIMA and SSA, achieve lower average forecast errors than LSTM across stations SMP, CRB, and ATE. This finding suggests that for data with seasonal patterns and relatively short time series, traditional models may be more efficient and robust. Although neural networks have the potential to capture more complex relationships and long-term dependencies, their performance may be limited by hyperparameter settings and intrinsic data characteristics.
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(This article belongs to the Special Issue Air Pollution in Urban and Industrial Areas III)
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Open AccessArticle
A Multidimensional Assessment of CO2-Intensive Economies Through the Green Economy Index Framework
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Halina Falfushynska
Environments 2025, 12(6), 195; https://doi.org/10.3390/environments12060195 - 9 Jun 2025
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Despite growing international consensus on the urgency of climate action, global CO2 emissions have continued to rise, exposing a critical implementation gap between environmental ambition and reality. This study explores the readiness and structural capacity of the world’s most CO2-intensive
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Despite growing international consensus on the urgency of climate action, global CO2 emissions have continued to rise, exposing a critical implementation gap between environmental ambition and reality. This study explores the readiness and structural capacity of the world’s most CO2-intensive countries to transition toward a green and hydrogen-based economy. We introduce and apply the Green Economy Index, a composite measure integrating 31 indicators across four core dimensions—political and regulatory efficiency, socio-economic status, infrastructure, and sustainable targets. Using data from 29 countries emitting over 200 Mt of CO2 in 2022, the analysis combines principal component analysis, Random Forest modeling, and network-based correlation analysis to classify nations into frontrunners, transitional performers, and structural laggers. The results reveal significant disparities in green economy readiness, with high-income countries showing institutional maturity and infrastructural robustness, while middle-income nations remain constrained by fossil fuel dependencies and governance challenges. Importantly, we highlight the growing utility of machine learning and multivariate statistics in capturing complex sustainability interdependencies. The Green Economy Index framework offers a relevant tool to benchmark progress, diagnose barriers, and guide targeted interventions in global decarbonization efforts.
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Open AccessReview
Reviewing Treatment Options for Organohalogen Contamination: From Established Methods to Fungal Prospects
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Gerardo Aguilar, Jr., Leadin Khudur, Attila Tottszer, Julie A. Besedin, Sali K. Biek and Andrew S. Ball
Environments 2025, 12(6), 194; https://doi.org/10.3390/environments12060194 - 9 Jun 2025
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Persistent organohalogen pollutants—including halogenated nitrophenols (HNCs), trichloroethylene (TCE), and per- and polyfluoroalkyl substances (PFAS)—pose serious environmental and health risks due to their stability, toxicity, and bioaccumulation potential. This review critically assesses current remediation technologies including advanced oxidation processes (AOPs), adsorption, membrane filtration, and
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Persistent organohalogen pollutants—including halogenated nitrophenols (HNCs), trichloroethylene (TCE), and per- and polyfluoroalkyl substances (PFAS)—pose serious environmental and health risks due to their stability, toxicity, and bioaccumulation potential. This review critically assesses current remediation technologies including advanced oxidation processes (AOPs), adsorption, membrane filtration, and thermal treatments. While these methods can be effective, they are often limited by high costs, energy demands, toxic byproduct formation, and sustainability concerns. Emerging biological approaches offer promising alternatives. Among these, fungal-based degradation methods (mycodegradation) remain significantly underrepresented in the literature, despite fungi demonstrating a high tolerance to contaminants and the ability to degrade structurally complex compounds. Key findings reveal that white-rot fungi such as Phanerochaete chrysosporium and Trametes versicolor possess enzymatic systems capable of breaking down persistent organohalogens under conditions that inhibit bacterial activity. This review also identifies critical research gaps, including the need for direct comparative studies between fungal and bacterial systems. The findings suggest that integrating mycodegradation into broader treatment frameworks could enhance the environmental performance and reduce the long-term remediation costs. Overall, this review highlights the importance of diversifying remediation strategies to include scalable, low-impact biological methods for addressing the global challenge of organohalogen contamination.
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Open AccessArticle
Enhancing the Detection and Identification Sensitivity of Organophosphorus Pesticide-Related Phenols via Derivatization and LC-ESI-MS/MS: A Straightforward Approach to Identify the Specific Pesticide Involved in Exposure
by
Avi Weissberg, Tamar Shamai Yamin, Avital Shifrovitch, Adi Tzadok, Merav Blanca and Moran Madmon
Environments 2025, 12(6), 193; https://doi.org/10.3390/environments12060193 - 8 Jun 2025
Abstract
Organophosphorus (OP) pesticides are a class of chemicals that are extensively used worldwide. The exposure to and use of organophosphates can be assessed by analyzing their metabolites and degradation products, such as dialkyl phosphate (DAP), dialkyl thiophosphate (DATP), and dialkyl dithiophosphate (DADTP). However,
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Organophosphorus (OP) pesticides are a class of chemicals that are extensively used worldwide. The exposure to and use of organophosphates can be assessed by analyzing their metabolites and degradation products, such as dialkyl phosphate (DAP), dialkyl thiophosphate (DATP), and dialkyl dithiophosphate (DADTP). However, since these metabolites/hydrolysis products can result from the metabolism or breakdown of several organophosphorus pesticide families, they serve as nonspecific biomarkers and do not indicate the specific pesticide involved in exposure. In an earlier study, chemical derivatization using N-(2-(bromomethyl)benzyl)-N,N-diethylethanaminium bromide (CAX-B) was described to improve the signal intensity of numerous organophosphorus (OP) acids in liquid chromatography tandem mass spectrometry (LC-ESI-MS/MS) analysis. In the present study, CAX-B was employed to derivatize a set of seven phenolic compounds corresponding to the complementary portion of OP pesticides. The derivatization process using CAX-B was performed in acetonitrile with potassium carbonate at 50 °C for 30 min. LC-Orbitrap-ESI-MS/MS was used to analyze the resulting phenol derivatives and their fragmentation patterns were studied. Notably, the derivatized phenols were markedly more sensitive than the underivatized phenols when LC-ESI-MS/MS was used in MRM technique, without being affected by the sample matrix (soil or plant extracts). This derivatization technique aids in identifying OP pesticides, offers insights into their subfamily, and pinpoints a specific compound through the analysis of corresponding phenol derivative.
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(This article belongs to the Special Issue Monitoring and Assessment of Inorganic and Organic Microcontaminants in Soil, Sediment, Water Systems)
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A Field-Scale Assessment of the Impact of Conventional and Permeable Concrete Pavements on Surface and Air Temperatures
by
Lu-Ming Chen, Jui-Wen Chen, Timothy J. Lecher and Paul C. Davidson
Environments 2025, 12(6), 192; https://doi.org/10.3390/environments12060192 - 7 Jun 2025
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Environmental impacts, such as elevated temperatures due to urban heat islands (UHIs), associated with land cover change due to urbanization, should not be ignored. In contrast to conventional impermeable concrete, permeable pavements have been implemented as green infrastructure strategies for achieving environmental benefits,
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Environmental impacts, such as elevated temperatures due to urban heat islands (UHIs), associated with land cover change due to urbanization, should not be ignored. In contrast to conventional impermeable concrete, permeable pavements have been implemented as green infrastructure strategies for achieving environmental benefits, such as stormwater management. Their impacts and benefits on other environmental aspects should not be ignored, especially for those with limited discussion in the literature. Therefore, this study monitored the surface and air temperatures of three types of pavements: conventional impermeable concrete (IC), pervious concrete (PC), and the patented JW Eco-technology (JW). As UHIs are more intense in the summer, temperature profiles during targeted periods when surface temperatures exceeded 40 °C for consecutive days were examined. In addition, as an available option at the study site, shade was created to evaluate its effect on surface temperatures across the pavement systems. Overall, the annual average surface and air temperatures of the three pavements were similar. However, seasonal and diurnal variations in temperatures were both observed, suggesting summer was the season when the differences in temperatures among pavements were most noticeable. Investigation during the targeted periods revealed that the average surface temperatures of PC were 2.4–2.7 °C and 3.2–3.3 °C higher than those observed on IC and JW, and the average air temperature of PC was 1.8 °C greater than that of IC and JW between 12:00 and 16:00. On the contrary, the average surface temperatures of PC were significantly lower than those on IC (1.3–1.4 °C) and JW (1.5 °C) between 21:00 and 5:00. Results also indicate that shade was an effective way to alleviate the high surface temperatures during the warm hours by lowering surface temperatures 21.0 °C, 15.4 °C, and 15.0 °C, for PC, IC, and JW, respectively. Finally, temperatures associated with the aqueducts of JW Eco-technology and the impacts on overall surface temperatures will be discussed.
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Integration of Mosses (Funaria hygrometrica) and Lichens (Xanthoria parietina) as Native Bioindicators of Atmospheric Pollution by Trace Metal Elements in Mediterranean Forest Plantations
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Malek Bousbih, Mohammed S. Lamhamedi, Mejda Abassi, Damase P. Khasa and Zoubeir Bejaoui
Environments 2025, 12(6), 191; https://doi.org/10.3390/environments12060191 - 6 Jun 2025
Abstract
Atmospheric emissions of industrial-origin trace metals are a major environmental problem that negatively affects air quality and the functioning of forest ecosystems. Traditional air quality monitoring methods require investments in equipment and infrastructure. Indeed, it is difficult to measure most of these pollutants
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Atmospheric emissions of industrial-origin trace metals are a major environmental problem that negatively affects air quality and the functioning of forest ecosystems. Traditional air quality monitoring methods require investments in equipment and infrastructure. Indeed, it is difficult to measure most of these pollutants because their concentrations usually occur at very low levels. However, this study explores an ecological approach for low-cost air quality biomonitoring that is based on native biological indicators in the context of the Mediterranean basin. This study aims (i) to evaluate the lichen species composition, diversity, and distribution across three distinct forest sites; (ii) investigate the relationship between lichen species richness and proximity to the pollution source; and (iii) evaluate heavy metal bioaccumulation using a moss species (Funaria hygrometrica) and a lichen species (Xanthoria parietina) as bioindicators of atmospheric pollution. High concentrations of toxic metals were observed along the transect and closer to the pollutant source with marked interspecies variability. X. parietina exhibited high bioaccumulation potential for most toxic metals (Fe, Zn, Pb, Cr, Cu, and Ni) compared to F. hygrometrica with concentrations varying across the three sites, reaching maximum dry-mass values of 6289 µg/g for Fe at the first site and 226 µg/g for Zn at Site 3. Our results suggest that X. parietina can be used as a potential bioindicator for long-term spatial biomonitoring of air quality by determining atmospheric toxic metals concentrations.
Full article
(This article belongs to the Special Issue Trace Metals in the Environment: Advances in Detection Techniques, Pollution Assessment and Management)
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Open AccessArticle
Exploitation of the Herbicide Effect of Compost for Vineyard Soil Management
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Piergiorgio Romano, Lorenzo Samuil Mordos, Marcello Stifani, Francesco Mello, Corrado Domanda, Daniel Grigorie Dinu, Concetta Eliana Gattullo, Gianluca Pappaccogli, Gianni Zorzi, Rita Annunziata Accogli and Laura Rustioni
Environments 2025, 12(6), 190; https://doi.org/10.3390/environments12060190 - 5 Jun 2025
Abstract
Soil management in vineyards is a crucial component of sustainable viticulture. Weed control under the row has traditionally been addressed using mechanical, physical, and chemical techniques, but herbicides pose environmental and health risks. The circular economy offers an alternative approach by converting organic
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Soil management in vineyards is a crucial component of sustainable viticulture. Weed control under the row has traditionally been addressed using mechanical, physical, and chemical techniques, but herbicides pose environmental and health risks. The circular economy offers an alternative approach by converting organic waste into a resource, such as compost. This study explores the effectiveness of compost derived from the organic fraction of municipal solid waste (MSW) not only as a mulching technique but also as a potential biological agent for weed control through allelopathic mechanisms in vineyards. Experiments were conducted both in the field and under controlled conditions. In the field, compost was applied under the vine row as mulch and incorporated into the soil. Under controlled conditions, germination tests were performed to assess weed inhibition at different compost concentrations. Field results demonstrated that compost applications, both as mulch and incorporated into the soil, significantly inhibited weed growth during the first period after application compared to the tilled control without compost. Thus, this inhibition is not limited to physical mulching; it also applies to the release of allelopathic compounds from compost. Controlled condition experiments showed strong inhibition of germination in Cichorium intybus and Foeniculum vulgare seeds, confirming the anti-germinative effects of compost, particularly on small-seeded weed species. Compost is a promising tool for sustainable vineyard management, offering fertilization and weed-suppression benefits while reducing herbicide use.
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(This article belongs to the Special Issue New Insights in Soil Quality and Management, 2nd Edition)
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Open AccessBrief Report
Locating Low-Cost Air Quality Monitoring Devices in Low-Resource Regions Is Not Enough to Acquire Robust Air Quality Data Usable for Policy Decisions
by
Adaeze Emekwuru, Alexander Wokoma, Otonye Ojuka, Isaac Amadi, Miebaka Moslen, Chidinma Amuzie and Nwabueze Emekwuru
Environments 2025, 12(6), 189; https://doi.org/10.3390/environments12060189 - 4 Jun 2025
Abstract
Air quality monitoring (AQM) is key to maintaining healthy air in cities. This is crucial in low- and middle-income countries due to increasing evidence of poor air quality but lack of monitors to consistently collect evaluate air quality data and effect policy changes,
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Air quality monitoring (AQM) is key to maintaining healthy air in cities. This is crucial in low- and middle-income countries due to increasing evidence of poor air quality but lack of monitors to consistently collect evaluate air quality data and effect policy changes, mainly because of the costs of monitoring devices. In participating in a challenge for the development of low-cost AQM devices in low-resource regions, an Arduino-based device with sensors for particulate matter size, temperature, and humidity data acquisition was developed for deployment in Port Harcourt, a city in Nigeria’s Niger Delta region, exposed to poor air quality partly due to gas and oil production activities. During the project, challenges to AQM were encountered, including inadequate awareness of air quality issues, lack of necessary AQM device components, unavailability of trained manpower and partnerships, and lack of funding. However, lack of a means of calibrating the device was a major hindrance, as no reference AQM instrument was available, rendering the data acquired largely qualitative, educational, and useless for regulatory purposes. There is an urgent need for AQM in such cities. However, a robust AQM strategy must be designed and used to address these constraints, especially whilst using low-cost devices, for significant progress in acquiring robust air quality data in such low-resource regions to be made.
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(This article belongs to the Special Issue Editorial Board Members' Collection Series: Air Quality Assessment and Management, 2nd Edition)
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Open AccessArticle
Urban Source Apportionment of Potentially Toxic Elements in Thessaloniki Using Syntrichia Moss Biomonitoring and PMF Modeling
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Themistoklis Sfetsas, Sopio Ghoghoberidze, Panagiotis Karnoutsos, Vassilis Tziakas, Marios Karagiovanidis and Dimitrios Katsantonis
Environments 2025, 12(6), 188; https://doi.org/10.3390/environments12060188 - 4 Jun 2025
Abstract
Urban air pollution from potentially toxic elements (PTEs) presents a critical threat to public health and environmental sustainability. The current study employed Syntrichia moss in a passive biomonitoring capacity to ascertain the levels of atmospheric PTE pollution in Thessaloniki, Greece. A comprehensive collection
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Urban air pollution from potentially toxic elements (PTEs) presents a critical threat to public health and environmental sustainability. The current study employed Syntrichia moss in a passive biomonitoring capacity to ascertain the levels of atmospheric PTE pollution in Thessaloniki, Greece. A comprehensive collection of 192 moss samples was undertaken at 16 urban sampling points over the March–July 2024 period. Concentrations of 21 PTEs were quantified using ICP-MS, and contamination levels were assessed through contamination factor (CF), enrichment factor (EF), and pollution load index (PLI). Positive matrix factorization (PMF) modeling and multivariate statistical analyses were used to identify pollution sources and spatiotemporal variations. Results revealed persistent hotspots with significant anthropogenic enrichments of elements, such as Fe, Mn, Sn in industrial zones and Tl, Ce, Pt in traffic corridors. PMF modeling attributed 48% of the measured PTE variance to traffic-related sources, 35% to industrial sources, and 17% to crustal material. Seasonal transitions showed a significant 3.5-fold increase in Tl during summer, indicating elevated traffic-related emissions. This integrated multi-index and source apportionment framework demonstrates the efficacy of Syntrichia moss for high-resolution urban air quality assessment. The approach offers a cost-effective, scalable, and environmentally friendly tool to support EU-aligned air quality management strategies.
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(This article belongs to the Special Issue Air Pollution in Urban and Industrial Areas III)
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Convergence Research for Microplastic Pollution at the Watershed Scale
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Heejun Chang, Elise Granek, Amanda Gannon, Jordyn M. Wolfand and Janice Brahney
Environments 2025, 12(6), 187; https://doi.org/10.3390/environments12060187 - 3 Jun 2025
Abstract
Microplastics are found in Earth’s atmosphere, lithosphere, hydrosphere, pedosphere, and ecosphere. While there is a growing interest and need to solve this grand challenge in both the academic and policy realms, few have engaged with academics, policymakers, and community partners to co-identify the
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Microplastics are found in Earth’s atmosphere, lithosphere, hydrosphere, pedosphere, and ecosphere. While there is a growing interest and need to solve this grand challenge in both the academic and policy realms, few have engaged with academics, policymakers, and community partners to co-identify the problem, co-design research, and co-produce knowledge in tackling this issue. Using a convergence research framework, we investigated the perception of microplastic pollution among different end users, delivered educational materials to K-12 teachers and practitioners, and identified key sampling points for assessing environmental microplastic concentrations in the Columbia River Basin, United States. Three community partner workshops identified regional issues and concerns associated with microplastic pollution and explored potential policy intervention strategies. The stakeholder survey, co-designed with community partners, identified varying perceptions around microplastic pollution across educators, government employees, non-profit employees, and industry practitioners. Pre- and post-test results of teacher workshops show increases in participants’ knowledge after taking a four-week summer class with the knowledge being translated to their students. Community partners also helped develop a unique passive sampling plan for atmospheric deposition of microplastics using synoptic moss samples and provided freshwater samples for microplastic quantification across the basin. Our study drew three major lessons for successfully conducting convergence environmental research—(1) communication and trust building, supported by the use of key-informants to expand networks; (2) co-creation through collaboration, where partners and students shaped research and education to enhance impact; and (3) change-making, as project insights were translated into policy discussions, community outreach, and classrooms.
Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Plastic Contamination)
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Open AccessArticle
Enhancement in Lithium Recovery from Spent Lithium Batteries by Nanofiltration Membranes
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Giuseppe Prenesti, Antonio Tagarelli, Rosangela Elliani, Anna Napoli, Alessio Caravella, Elena Tocci, Gregorio Cappuccino and Alfredo Cassano
Environments 2025, 12(6), 186; https://doi.org/10.3390/environments12060186 - 1 Jun 2025
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The recovery of lithium from extracts obtained from a black mass of spent lithium-ion batteries treated with a ternary solvent system at acidic pH was investigated using flat-sheet nanofiltration (NF) membranes operated according to a dead-end configuration. Specifically, four samples obtained at different
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The recovery of lithium from extracts obtained from a black mass of spent lithium-ion batteries treated with a ternary solvent system at acidic pH was investigated using flat-sheet nanofiltration (NF) membranes operated according to a dead-end configuration. Specifically, four samples obtained at different pH values (2.5 and 5) and extraction times (48, 96 and 168 h) were treated in selected operating conditions by using two commercial polymeric membranes (denoted DK and HL, with an approximate molecular weight cut-off of 150–300 Da) up to a volume reduction factor (VRF) of 4. Membrane performance was assessed in terms of productivity and selectivity towards specific ions, including lithium. For most treated samples, the HL membrane exhibited higher permeate fluxes in comparison to the DK membrane. However, the DK membrane performed better in terms of lithium rejection than the HL membrane, with a negative rejection at VRF 4 observed for all treated samples. More than 90% of multivalent ions were rejected by both membranes independently of the VRF. The membrane ability to retain multivalent ions led to their progressive concentration in the retentate as the VRF increased. The extraction time did not impact the NF performance of both membranes in terms of ion rejection. For the DK membrane conditions of extraction of 96 h and pH 5 represented the best trade-off between flux, ion rejection, and total lithium recovery.
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Open AccessArticle
Remediating Per- and Polyfluoroalkyl Substances (PFAS)-Contaminated Water by Foam Fractionation and Electrochemical Oxidation
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Steve Comfort, Amanda Araújo da Silva, Jessica Powell, Rebecca Cain, Ashleigh McGreer and Renato F. Dantas
Environments 2025, 12(6), 185; https://doi.org/10.3390/environments12060185 - 31 May 2025
Abstract
Per- and polyfluoroalkyl substances (PFASs) are a family of synthetic chemicals that were used to improve the quality of several commercial products by making them resistant to heat, oil, stains, and grease. By containing a fluorinated carbon tail and a hydrophilic head (-COOH,
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Per- and polyfluoroalkyl substances (PFASs) are a family of synthetic chemicals that were used to improve the quality of several commercial products by making them resistant to heat, oil, stains, and grease. By containing a fluorinated carbon tail and a hydrophilic head (-COOH, -SO3H), PFASs act as surfactants that are attracted to bubble–water interfaces. Foam fractionation is the process of facilitating PFAS–air bubble interactions for the purpose of removing contaminants from tainted water. In this paper, we report on the use of foam fractionation and electrochemical oxidation (EO) under stirred batch conditions (200 mL) to remediate PFAS-contaminated water. We used radiolabeled PFOA (perfluorooctanoic acid; 14C-PFOA) as a representative surrogate to quickly screen treatment variables of flow rate, pH, temperature, and soap mass. Using radiolabeled PFASs eliminated the possibility of cross-contamination and greatly reduced analytical costs and processing time. The results showed that foam fractionation can remove 80 to 90 percent of PFOA from water within 30 min and that 90 to 100 percent of the PFOA in the concentrated foamate can be oxidized via electrochemical oxidation (-14COOH → 14CO2). We also tested the efficacy of the combined foam fractionation–EO treatment in natural waters by spiking 14C-PFOA and a cosolvent (CTAB) into PFAS-contaminated water obtained from two field sites with divergent PFAS concentrations and differing sources of PFAS contamination (natural drainage ditch vs. WWTP). Using a larger-scale tank (3500 mL), we observed that foam fractionation was 90% effective in removing 14C-PFOA from the WWTP effluent but only 50% effective for the drainage ditch water. Regardless, EO was highly effective in oxidizing 14C-PFOA in the foamate from both sources with half-lives (T1/2) ranging from 8.7 to 15 min. While water chemistry differences between source waters may have influenced foam fractionation and require additional investigations, tank experiments provide the first proof-of-concept experiment using 14C-PFASs that foam fractionation and electrochemical oxidation can be used in tandem to treat PFAS-contaminated water.
Full article
(This article belongs to the Special Issue Advanced Catalytic Processes and Nanomaterials for Environmental Remediation)
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Street-Level Sensing for Assessing Urban Microclimate (UMC) and Urban Heat Island (UHI) Effects on Air Quality
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Lirane Kertesse Mandjoupa, Pradeep Behera, Kibria K. Roman, Hossain Azam and Max Denis
Environments 2025, 12(6), 184; https://doi.org/10.3390/environments12060184 - 30 May 2025
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During the intense heatwaves of late summer 2024, Washington, D.C.’s urban landscape revealed the powerful influence of urban morphology on microclimates and air quality. This study investigates the impact of building height-to-width (H/W) ratios on the urban heat island (UHI) effect, using a
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During the intense heatwaves of late summer 2024, Washington, D.C.’s urban landscape revealed the powerful influence of urban morphology on microclimates and air quality. This study investigates the impact of building height-to-width (H/W) ratios on the urban heat island (UHI) effect, using a combination of field measurements and Computational Fluid Dynamics (CFD) simulations to understand the dynamics. Street-level data collected from late August to November 2024 across three sites in Washington, D.C., indicate that high H/W ratios (1.5–2.0) increased temperatures by approximately 2–3 °C and reduced wind speeds to around 0.8 m/s. These conditions led to elevated pollutant concentrations, with ozone (O3) ranging from 1.8 to 7.3 ppb, nitrogen dioxide (NO2) from 0.3 to 0.5 ppm, and carbon monoxide (CO) remaining relatively constant at approximately 2.1 ppm. PM2.5 concentrations fluctuated between 2.8 and 0.4 g/m3. Meanwhile, lower H/W ratios (less than 1.5) demonstrated better air circulation and lower pollution levels. The CFD simulations are in agreement with the experimental data, yielding an RMSE of 0.75 for temperature, demonstrating its utility for forecasting UHI effects under varying urban layouts. These results demonstrate the potential of Computational Fluid Dynamics in not only modeling but also predicting UHI dynamics.
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Open AccessReview
The Fate of Chemical Contaminants in Soil with a View to Potential Risk to Human Health: A Review
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Gianniantonio Petruzzelli, Beatrice Pezzarossa and Francesca Pedron
Environments 2025, 12(6), 183; https://doi.org/10.3390/environments12060183 - 30 May 2025
Abstract
This review reports some aspects of soil contaminant chemistry and its fundamental role in shaping the soil–human health relationship. Exposure to soil contaminants can occur through direct pathways, such as ingestion, inhalation, and dermal contact, as well as indirect pathways, including food chain
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This review reports some aspects of soil contaminant chemistry and its fundamental role in shaping the soil–human health relationship. Exposure to soil contaminants can occur through direct pathways, such as ingestion, inhalation, and dermal contact, as well as indirect pathways, including food chain contamination via plant uptake or groundwater leaching. The mobility and persistence of organic and inorganic pollutants in soil are primarily controlled by sorption–desorption processes, which involve a complex interplay of physical and chemical mechanisms. Soil properties, such as pH, organic matter content, clay minerals, and oxide hydroxides, play a crucial role in regulating these processes and determining contaminant behavior. A high sorption capacity enhances the soil’s ability to mitigate pollutant mobility, thereby reducing their infiltration into groundwater and accumulation in the food chain. Soils rich in organic matter and fine-textured minerals, such as clay, can effectively immobilize contaminants, limiting their bioavailability and potential harm to human health. A deeper understanding of how soil characteristics influence contaminant mobility and bioavailability is critical to addressing the hazards of soil pollution for human health. Beyond merely assessing contaminant concentrations, it is essential to consider the dynamic processes governing pollutant fate in soil, as they ultimately shape exposure pathways and health risks. This knowledge is the key to developing more effective strategies for mitigating soil contamination and protecting public health.
Full article
(This article belongs to the Special Issue Environments: 10 Years of Science Together)
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Open AccessReview
The Sustainable Management of Nitrogen Fertilizers for Environmental Impact Mitigation by Biochar Applications to Soils: A Review from the Past Decade
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Yudai Kohira, Desalew Fentie, Mekuanint Lewoyehu, Tassapak Wutisirirattanachai, Ashenafei Gezahegn, Milkiyas Ahmed, Shinichi Akizuki, Solomon Addisu and Shinjiro Sato
Environments 2025, 12(6), 182; https://doi.org/10.3390/environments12060182 - 30 May 2025
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This review assesses biochar’s potential to mitigate nitrogen (N) losses when co-applied with N fertilizers, emphasizing mechanisms linked to its measurable physicochemical properties. The mitigation of ammonia (NH3) volatilization shows variable effects from its cation exchange capacity (−21.7% to 20.4%) and
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This review assesses biochar’s potential to mitigate nitrogen (N) losses when co-applied with N fertilizers, emphasizing mechanisms linked to its measurable physicochemical properties. The mitigation of ammonia (NH3) volatilization shows variable effects from its cation exchange capacity (−21.7% to 20.4%) and specific surface area (SSA; −23.8% to 39.1%). However, the biochar pH (influencing mitigation from −45.0% to −9.0%) and application rate are key factors, with clayey soils exhibiting the greatest mitigation (−52.2%), potentially due to their high bulk density. High SSA biochar, often from high pyrolysis temperatures, reduces nitrate-N (NO3−-N) leaching (up to −26.6%) by improving the soil’s water-holding capacity. A co-application with organic fertilizers shows a pronounced mitigation (up to −39.0%) due to a slower N release coupled with biochar adsorption. A high SSA also plays an important role in mitigating nitrous oxide (N2O) emissions (up to −25.9%). A higher biochar C/N ratio promotes microbial N immobilization, contributing to N2O reductions (+1.5% to −34.2%). Mitigation is greater in sandy/loamy soils (−18.7% to −7.9%) than in clayey soils, where emissions might increase (+18.0%). Overall, biochar applications demonstrate significant potential to mitigate N losses and improve N use efficiency, thereby supporting sustainable agriculture; however, its effectiveness is optimized when biochar properties (e.g., high SSA and appropriate C/N ratio) and application strategies are tailored to specific soil types and N sources.
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Open AccessArticle
Environment Friendly Biodegradable Sprayable Shrimp Waste Fertilizer and Low-Cost Crab Waste Carbon Fixer
by
Viral Sagar and Joan G. Lynam
Environments 2025, 12(6), 181; https://doi.org/10.3390/environments12060181 - 29 May 2025
Abstract
Seafood waste is often landfilled and/or discarded into water, raising microbiological pollution and environment policy concerns. Repurposing this low-cost biomass collected at point-source processing centers can help reduce greenhouse gas emissions and support industrial progress in developing economies. Safe alternative methods to utilize
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Seafood waste is often landfilled and/or discarded into water, raising microbiological pollution and environment policy concerns. Repurposing this low-cost biomass collected at point-source processing centers can help reduce greenhouse gas emissions and support industrial progress in developing economies. Safe alternative methods to utilize seafood waste were investigated. Hydrothermal carbonization-enriched shrimp shell waste was converted into higher-value products, such as sprayable fertilizer and dry biochar fertilizer pellets. Environment friendly sprayable fertilizer from shrimp and crab shell waste as an inexpensive carbon fixer is a potential solution. An average spray coverage area of 0.12 m2 from only 300 mL of 1:10 shrimp shell waste to water mixture is reported. Characterization using N:P:K ratios from elemental analysis showed crustacean shell waste to comprise long-term organic carbon fixers in the soil with minor mineral enrichment, demonstrating potential for long-term soil care. Additionally, hydrothermally carbonized mineral rich shrimp shell and untreated crab shell waste were pelletized to test their friability and feasibility in transportation. Such a bio-investigation to promote economic goals for sustainability can improve biomass waste handling locally.
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(This article belongs to the Special Issue Preparation and Application of Biochar (Second Edition))
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Open AccessReview
Drivers of Mercury Accumulation in Juvenile Antarctic Krill, Epipelagic Fish and Adélie Penguins in Different Regions of the Southern Ocean
by
Roberto Bargagli and Emilia Rota
Environments 2025, 12(6), 180; https://doi.org/10.3390/environments12060180 - 29 May 2025
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Antarctica and the Southern Ocean are important sinks in the global mercury (Hg) cycle, and in the marine environment, inorganic Hg can be converted by bacteria to monomethylmercury (MeHg), a highly bioavailable and toxic compound that biomagnifies along food webs. In the Southern
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Antarctica and the Southern Ocean are important sinks in the global mercury (Hg) cycle, and in the marine environment, inorganic Hg can be converted by bacteria to monomethylmercury (MeHg), a highly bioavailable and toxic compound that biomagnifies along food webs. In the Southern Ocean, higher concentrations of Hg and MeHg have typically been reported in the coastal waters of the Ross and Amundsen Seas, where katabatic winds can transport Hg from the Antarctic Plateau and create coastal polynyas, which results in spring depletion events of atmospheric Hg. However, some studies on MeHg biomagnification in Antarctic marine food webs have reported higher Hg concentrations in penguins from sub-Antarctic waters and, unexpectedly, higher levels in juvenile krill than those in adult Antarctic krill. In light of recent estimates of the phytoplankton and zooplankton biomass and distribution in the Southern Ocean, this review suggests that although most studies on MeHg biomagnification refer to the short diatom–krill–vertebrate food chain, alternative and more complex pelagic food webs exist in the Southern Ocean. Thus, juvenile krill and micro- and mesozooplankton grazing on very small autotrophs and heterotrophs, which have high surface-to-volume ratios for MeHg ad-/absorption, may accumulate more Hg than consumers of large diatoms, such as adult krill. In addition, the increased availability of Hg and the different diet contribute to a greater metal accumulation in the feathers of Adélie penguins from the Ross Sea than that of those from the sub-Antarctic.
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Open AccessArticle
Evaluation of Standardised (ISO) Leaching Tests for Assessing Leaching and Solid–Solution Partitioning of Perfluoroalkyl Substances (PFAS) in Soils
by
Dan B. Kleja, Hugo Campos-Pereira, Johannes Kikuchi-McIntosh, Michael Pettersson, Oksana Golovko and Anja Enell
Environments 2025, 12(6), 179; https://doi.org/10.3390/environments12060179 - 29 May 2025
Abstract
The spread of per- and polyfluoroalkyl substances (PFAS) in the environment poses a severe threat to soil organisms, aquatic life, and human health. Many PFAS compounds are mobile and easily transported from soils to groundwater and further to surface waters. Leaching tests are
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The spread of per- and polyfluoroalkyl substances (PFAS) in the environment poses a severe threat to soil organisms, aquatic life, and human health. Many PFAS compounds are mobile and easily transported from soils to groundwater and further to surface waters. Leaching tests are valuable tools for assessing the site-specific leaching behaviour of contaminants. Here, we report the results of an evaluation of two standardized leaching tests for PFAS-contaminated soil materials: the batch test (ISO 21268-2:2019) using either demineralized water or 1 mM CaCl2 as leachants (liquid-to-solid (L/S) ratio of 10) and the up-flow percolation test (ISO 21268-3:2019) using 1 mM CaCl2 as leachant. One field-contaminated soil and three spiked (12 PFAS compounds) soils (aged 5 months) were included in the study. Desorption kinetics in the batch test were fast and equilibrium was obtained for all PFAS compounds within 24 h, the prescribed equilibration time. The same solubility was obtained for short-chain PFAS (PFBA, PFHxA, PFHpA, PFBS) in demineralized water and 1 mM CaCl2, whereas significantly lower solubility was often observed for long-chain PFAS in CaCl2 than in water, probably due to decreased charge repulsion between soil surfaces and PFAS compounds. In the up-flow percolation test, concentrations of short-chain PFAS in leachates decreased rapidly with increasing L/S, in contrast to long-chain PFAS, where concentrations decreased gradually or remained constant. Solid–solution partitioning coefficients (Kd), calculated from the data of the batch and percolation tests (1 mM CaCl2), were generally in agreement, although differing by more than three orders of magnitude between different PFAS compounds. Uncertainties and pitfalls when calculating Kd values from leaching test data are also explored.
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(This article belongs to the Special Issue Monitoring and Assessment of Inorganic and Organic Microcontaminants in Soil, Sediment, Water Systems)
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Open AccessArticle
Association of PFAS and Metals with Cardiovascular Disease Risk: Exploring the Mediating Effect of Diet
by
Augustina Odediran, Kenneth Bollen and Emmanuel Obeng-Gyasi
Environments 2025, 12(6), 178; https://doi.org/10.3390/environments12060178 - 28 May 2025
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Background: Cardiovascular disease (CVD) is a major global health burden influenced by genetic, behavioral, and environmental factors. Among these, exposure to per- and poly-fluoroalkyl substances (PFASs) and toxic metals has been increasingly implicated in adverse cardiovascular outcomes. However, the mediating role of dietary
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Background: Cardiovascular disease (CVD) is a major global health burden influenced by genetic, behavioral, and environmental factors. Among these, exposure to per- and poly-fluoroalkyl substances (PFASs) and toxic metals has been increasingly implicated in adverse cardiovascular outcomes. However, the mediating role of dietary inflammation in these associations remains unclear. Objective: This study investigates the relationship between PFAS and metal exposures and CVD risk, focusing on the potential mediating role of diet, operationalized through the Dietary Inflammatory Index (DII). Additionally, this study examines age as an effect modifier in these associations. Methods: Utilizing data from the National Health and Nutrition Examination Survey (NHANES) 2017–2018 cycle (n = 660), we assessed environmental exposures (lead, cadmium, mercury, perfluorooctanoic acid-PFOA, perfluorooctane sulfonate-PFOS), dietary inflammatory potential (DII), and cardiovascular markers (blood pressure, lipid profile, C-reactive protein). Statistical analyses included linear regression and Bayesian Kernel Machine Regression-Causal Mediation Analysis (BKMR-CMA) to estimate the direct, indirect (through DII), and total effects of exposure on CVD risk biomarkers. Results: Linear regression revealed significant associations between mercury and reduced systolic blood pressure (SBP) (p = 0.017) and cadmium with increased C-reactive protein (CRP) (p = 0.006). Mediation analysis suggested dietary inflammation may play a role, though estimates were imprecise. Conclusions: PFAS and metals may influence CVD risk through inflammatory pathways, with potential age-related differences. Future longitudinal studies are needed to clarify these complex interactions, reduce measurement error, and guide age-specific exposure regulations.
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Open AccessReview
Global Trends in Air Pollution Modeling over Cities Under the Influence of Climate Variability: A Review
by
William Camilo Enciso-Díaz, Carlos Alfonso Zafra-Mejía and Yolanda Teresa Hernández-Peña
Environments 2025, 12(6), 177; https://doi.org/10.3390/environments12060177 - 28 May 2025
Abstract
The objective of this article is to conduct a review to analyze global trends in the use of air pollution models under the influence of climate variability (CV) over urban areas. Five scientific databases were used (2013–2024): Scopus, ScienceDirect, SpringerLink, Web of Science,
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The objective of this article is to conduct a review to analyze global trends in the use of air pollution models under the influence of climate variability (CV) over urban areas. Five scientific databases were used (2013–2024): Scopus, ScienceDirect, SpringerLink, Web of Science, and Google Scholar. The frequency of citations of the variables of interest in the selected scientific databases was analyzed by means of an index using quartiles (Q). The results showed a hierarchy in the use of models: regional climate models/RCMs (Q3) > statistical models/SMs (Q3) > chemical transport models/CTMs (Q4) > machine learning models/MLMs (Q4) > atmospheric dispersion models/ADMs (Q4). RCMs, such as WRF, were essential for generating high-resolution projections of air pollution, crucial for local impact assessments. SMs, such as GAM, excelled in modeling nonlinear relationships between air pollutants and climate variables. CTMs, such as WRF-Chem, simulated detailed atmospheric chemical processes vital for understanding pollutant formation and transport. MLMs, such as ANNs, improved the accuracy of predictions and uncovered complex patterns. ADMs, such as HYSPLIT, evaluated air pollutant dispersion, informing regulatory strategies. The most studied pollutants globally were O3 (Q3) > PM (Q3) > VOCs (Q4) > NOx (Q4) > SO2 (Q4), with models adapting to their specific characteristics. Temperature emerged as the dominant climate variable, followed by wind, precipitation, humidity, and solar radiation. There was a clear differentiation in the selection of models and variables between high- and low-income countries. CTMs predominated in high-income countries, driven by their ability to simulate complex physicochemical processes, while SMs were preferred in low-income countries, due to their simplicity and lower resource requirements. Temperature was the main climate variable, and precipitation stood out in low-income countries for its impact on PM removal. VOCs were the most studied pollutant in high-income countries, and NOx in low-income countries, reflecting priorities and technical capabilities. The coupling between regional atmospheric models and city-scale air quality models was vital; future efforts should emphasize intra-urban models for finer urban pollution resolution. This study highlights how national resources and priorities influence air pollution research over cities under the influence of CV.
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(This article belongs to the Special Issue Air Pollution in Urban and Industrial Areas III)
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