Research & reports

YAO, Kouadio Assemien François, OUEDRAOGO, Moussa, BROU, Konan Richmond, COULIBALY, Léréyaha, OUATTARA, Ismaïla, N'CHO, Odon Clément, YAO, Koffi Blaise · Zenodo (CERN European Organization for Nuclear Research) · Côte d'Ivoire

Nine groundwater samples were collected in March 2025 from urban farming areas of the Man municipality, western Côte d’Ivoire, to assess their physicochemical and metallic quality. Analysis revealed high concentrations of major ions and nitrites (up to 101.7 mg/L) in the groundwater, exceeding WHO standards. Extreme pollution by cadmium, iron, and zinc was confirmed, with an overall contamination degree of 793.6. These groundwaters are unsuitable for human consumption and require regular monitoring and sustainable water resource management.

K M Tanjida Islam, Md Shahin Mahmud · Pharmacon Jurnal Farmasi Indonesia · Bangladesh

This study characterized multidrug-resistant (MDR) Shigella flexneri strains from contaminated raw vegetables in Bangladesh, retrieved from the NCBI genome database. Whole-genome sequences of four S. flexneri strains from tomatoes and green chilies in Gazipur and Dhaka were analyzed. The analysis identified 4273 core genes and 44 antibiotic resistance genes, with five essential hub genes (tolC, acrA, emrK, emrB, evgS) identified as high-priority therapeutic targets for compromising MDR mechanisms in food-borne S. flexneri.

Anaïs M. Kipelo, M. Jothilakshmi, Dhafer Mohammed M. Al Salah, Georgette N. Ngweme, Emmanuel K. Atibu, Crispin K. Mulaji, Periyasamy Sivalingam, John Poté · Toxicology Reports · Democratic Republic of the Congo (Kinshasa)

This study examined trace element levels in Brassica pekinensis Lour. from urban gardening sites (Cecomaf and Lutendele) in Kinshasa, Democratic Republic of the Congo, and associated human health risks. Analysis showed that Cr, Cu, Cd, Pb, and Hg concentrations in samples from both sites exceeded FAO/WHO maximum permissible limits. Health risk assessments indicated that Estimated Daily Intake (EDI) values for Cd and Pb exceeded recommended limits, and Target Hazard Quotient (THQ) values exceeded 1 for most metals, suggesting potential non-carcinogenic risks.

K I Safitri, Oekan S. Abdoellah, Budhi Gunawan, P Parikesit · Ethics in Science and Environmental Politics · Global

This qualitative study investigated the commercialization of urban agriculture and its influence on agricultural practices and environmental ethics, engaging 43 participants through observation, interviews, and documentation. Findings showed that global commercialization promotes policies for environmental sustainability, leading to aligned production methods. However, in local contexts, farmers cultivating sloped land without perennial crops often use artificial inputs and contaminated irrigation water, facing constraints from intermediaries.

Amon Abraham, Andrew G. Mtewa, Chimwemwe Chiutula, Richard Lizwe Steven Mvula, Alfred Maluwa, Fasil Ejigu Eregno, John Njalam’mano · International Journal of Environmental Research and Public Health · Malawi (Blantyre)

This cross-sectional study in Blantyre, Malawi, characterized antibiotic-resistant bacteria (ARB) prevalence in 35 samples from five livestock farms, including manure, soil, and vegetables. It found high contamination, with Escherichia coli dominating pig manure (52%) and farm soil (35%), and Klebsiella pneumoniae contaminating all sample types (up to 67% in home soils, 60% in vegetables). All manure isolates showed sulfamethoxazole–trimethoprim resistance, and vegetables exhibited severe multidrug resistance, including 100% E. coli resistance to gentamicin. Composting for ≤6 weeks did not eliminate ARBs, indicating manure-amended farms are AMR reservoirs.

E.N. Jenkins, John M. Galbraith, Anna Paltseva · SOIL · Global

This study conducted a literature review of 84 publications to evaluate the accuracy, precision, and practicality of Portable X-ray fluorescence (PXRF) as a tool for analyzing heavy metal contamination in urban soils. Urban soils often face contamination with heavy metals like lead and arsenic, and PXRF was shown to achieve reliable accuracy when properly calibrated. PXRF emerges as a viable method for assessing urban soil contamination.

Magboul M.S. Siddig, Stephen Boahen Asabere, Abdullah S. Al-Farraj, Eric C. Brevik, Daniela Sauer · Journal of Hazardous Materials Advances · Sudan

This systematic review and meta-analysis examined 76 publications on soil heavy metals in Sudan published between 1996 and 2024, assessing concentrations of 10 heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Zn) and potential ecological risk index (PERI) across 9 land-use types including urban agricultural, industrial, roadside, tannery, waste dump, rural agricultural, coastal sediment, gold mining, and river sediment areas. Average heavy metal levels across all land uses exceeded common soil ranges, with Cd, Cr, Cu, Hg, Ni, and Pb surpassing WHO/FAO limits. In urban agricultural soils, Cd averaged about 158 times and Hg about 340 times typical background ranges, while industrial, gold mining, and waste dump land uses exceeded a serious ecological risk threshold (PERI greater than 900). Cd and Hg together accounted for over 70% of PERI in waste dump and gold mining sites.

Álvaro Luis José Reyes Córdova · Horizontes Amazónicos · Ecuador

A bibliographic review of research on water quality in the Puyo River and its tributaries in Pastaza, Ecuador, compiled studies from scientific databases and institutional repositories reporting physicochemical, microbiological, and heavy metal parameters. The main sources of contamination were found to be wastewater discharges, fecal coliforms, and accumulation of heavy metals such as lead and mercury linked to urban, agricultural, and mining activities, with community perception aligning with technical findings as most of the population rated the water poor quality and associated it with health problems. Over the past twenty years, a progressive deterioration in water quality parameters has been documented, with increases in turbidity and pathogenic microorganisms despite some isolated recovery efforts, and the review concludes that lack of attention from the municipality and prefecture, together with the absence of continuous monitoring, is worsening the water crisis and demands comprehensive, participatory governance.

Pierre‐Alexandre Deyris, Franck Pélissier, Claire M. Grison, Claude Grison · Journal of Hazardous Materials Advances · Global

Herbicide use worldwide has doubled over the past 30 years, and diuron contamination of tropical aquatic ecosystems — affecting food crops such as pineapple — has been reported across Southeast Asia, the Pacific, and Africa. This perspective article examines taro (Colocasia esculenta), a widely cultivated crop whose tubers are consumed locally, as a nature-based means of mitigating diuron impact on tropical aquatic ecosystems through rhizofiltration, i.e., phytoaccumulation of the herbicide by the roots. Analysis of treated tubers found that diuron levels in the tuber core were below recommended European standards, indicating the tubers could remain edible for the local population and confirming compatibility with existing food uses.

Jennifer Newell, Siobhan Cox, Rory Doherty · Urban Agriculture & Regional Food Systems · Global

A systematic review synthesized literature on the oral bioaccessible fraction (BAF) of arsenic, cadmium, chromium, nickel, and lead in vegetables grown on contaminated soils, drawing values from multiple online databases across potentially toxic elements (PTEs), in vitro test methods, and vegetable types. The review starts from the premise that many urban and peri-urban brownfield sites carry a legacy of soil metal and metalloid contamination, so crops grown there may pose human health risks. Median PTE BAFs ranked Cd > Ni > Cr > As > Pb; among in vitro methods, the unified BARGE method (UBM) produced the highest median BAFs (63.0% gastric, 59.6% gastrointestinal); and by crop type, BAFs ranked non-vegetables (e.g., rice, fungi) > legumes > root vegetables > bulb vegetables > leafy vegetables.

José Luis Chaves, Alexandre Boleira Lopo, G. M. OLIVEIRA, J. F. ARAÚJO, Luciano Sérgio Ventin Bomfim, J. A. CASTRO · Editora Científica Digital eBooks · Global

This systematic review investigated the viability of animal production in urban and peri-urban agriculture as a tool for food security, using the PRISMA methodology. The review found that while this practice offers benefits like domestic food security and income generation, it also presents negative aspects such as odors, noise, and the transmission of zoonoses. Public policies are needed to regulate the activity and minimize health risks.

Miles P.A. Bate-Weldon, Jill L. Edmondson, Katie J. Field · iScience · Global

This study investigated the effect of urban environmentally relevant concentrations of zinc in soils on nutrient exchange between arbuscular mycorrhizal fungi and pea plants using radio-isotope tracing. It found that at higher zinc concentrations, the transfer of phosphorus from fungi to plants and carbon from plants to fungi dramatically decreased. The results suggest that while urban horticulture has potential for food production, the unchecked presence of contaminants like zinc in urban soils may critically hinder its realization.

Anjoulie Brandner, Karolina Taczanowska, Brenda Maria Zoderer, Christoph Schunko · Urban forestry & urban greening · Austria (Vienna)

A survey of 458 respondents in Vienna, Austria, analyzed urban wild food foraging locations and preferences for urban green spaces (UGS). 1239 foraging locations were identified across 9 UGS types, with forest and meadow landscapes, parks, and UGS mosaics being most utilized. Foragers' major concerns were contamination from traffic and dogs.

Dragana Šunjka, Sanja Lazić, Slavica Vuković, Siniša Berjan, Hamid El Bilali · · Serbia

This chapter examines the food safety of urban agriculture systems in the Republic of Serbia through selected case studies. It highlights that agricultural products from urban production may be contaminated by polluted soil, water, and air, as well as by pesticides, heavy metals, persistent organic pollutants, nitrate and nitrite, and mycotoxins. The study emphasizes the need for strict control and reduction of synthetic pesticides and other agrochemicals in urban agriculture.

Mohammad Reza Khalilnezhad, Mohammad Taheri, Alessio Russo, Negin Nasseh, Ahmad Taheri · Cities & Health · Iran

This study investigated factors affecting lead and cadmium levels in urban fruits in Tehran's Tarasht neighborhood, Iran, due to heavy traffic and urban gardens. It found that sites taller than 10 meters had the highest cadmium, while sites without barriers or with 4-meter barriers showed the highest lead content. Barrier width, urban fruit tree height (for lead), distance to the street, and fruit type also influenced heavy metal absorption, indicating significant contamination risks.

Nur Dinie Syahirah Sanusi, Fadhlina Che Ros, Siti Zulaikha Ngah Demon, Ismayadi Ismail, Imad Hamadneh · Journal of Advanced Research Design · Malaysia

This mini-review discusses the extensive use of AB mix nutrients in Malaysian urban farming, noting their role in high yields but also their contribution to significant environmental pollution when overused. Although a survey of local entrepreneurs showed most complied with guidelines for chili plants, intensive use of fertilizers leads to nutrient leaching into the soil, causing environmental pollution and affecting humans, livestock, and microbial life. The review emphasizes the need for controlled nutrient application to prevent soil degradation and groundwater contamination.

Muhammad Waqas, Kamran Ashraf, Muhammad Mohiuddin, Asim Abbasi, Khawar Sultan, Muhammad Umar, Hayssam M. Ali, M. Abdel-Hamid, Qamar Zaman · Notulae Botanicae Horti Agrobotanici Cluj-Napoca · Global

This study assessed heavy metal and metalloid concentrations in ridge gourd, soil, and irrigation water, finding that groundwater samples exceeded permissible limits for Ni, Fe, Cu, Pb, As, Cr, and Cd. Soil irrigated with groundwater showed Cd, Cr, and As above limits, and ridge gourd samples had higher Cd levels than safe limits. Consumption of ridge gourd from the studied area may pose health hazards due to elevated target hazard quotients for Zn, Fe, and Cr, and high cancer risks from Ni, Cr, Cd, As, and moderate risk from Pb in canal water.

Fernanda Olivares, John Clunes, Susana Valle, Dorota Dec · Agro Sur · Chile (Valdivia)

This study evaluated the quality of irrigation water in urban gardens in Valdivia, Chile, against Chilean standards NCh 1333 and NCh 409. Measured parameters included pH, electrical conductivity, total dissolved solids, and iron concentration. All urban gardens met the established standards, with the exception of the Collico garden, which showed an elevated iron concentration.

Nilanjana Ganguli, Anna Maria Subic, Janani Maheswaran, Byomkesh Talukder · Global Health Journal · Global

A systematic literature review of 55 papers identified five distinct planetary health risks associated with urban agriculture, despite its environmental benefits. The study highlighted particular concerns regarding trace metal bioaccumulation in soil and vegetables, posing health risks to populations. Additionally, risks related to wastewater irrigation, backyard livestock farming, and gaps in infectious disease research were identified.

Roberta Bulgari, Erdona Demiraj, Calogero Schillaci, Ahlem Tlili, Yushu Xia · Urban Agriculture & Regional Food Systems · Global

This special issue examines urban and peri-urban soil and plant management, highlighting that soil-related factors in urban agricultural systems pose unique challenges. Issues such as soil fertility, soil biodiversity, and soil contamination require further investigation to enhance urban agriculture's contribution to livability. The issue collects studies supporting sustainable soil management and crop diversification, and explores remote sensing and deep learning for soil health monitoring and plant disease detection related to contamination.

Fatimata Bintou Josiane Diarra, Isidore Juste O. Bonkoungou, Zakaria Garba, Namwin Siourimè Somda, Djifahamaï Soma, Marguerite Edith Malatala Nikiema, Évariste Bako, Souleymane Sore, Natéwindé Sawadogo, Nicolas Barro, Kaisa Haukka · Microorganisms · Burkina Faso (Ouagadougou)

A study in Ouagadougou, Burkina Faso, assessed the occurrence of extended-spectrum β-lactamase-producing Escherichia coli (ESBL-Ec) and Klebsiella spp. (ESBL-K) in 356 samples from lettuce, the environment, and gardeners' stools in market gardens. The overall prevalence of ESBL-producing bacteria was 65.2%. Specifically, ESBL-Ec was found in 25.0% of lettuce samples and ESBL-K in 43.4% of lettuce samples, indicating a high prevalence of these resistant bacteria in urban agriculture.

Prince Owusu Adoma, Afia Sakyiwaa Amponsah, Kwarteng Twumasi Ankrah, Francis Acquah, Hubert Amu, Richard Osei Agjei, Ruby Hanson · Environmental Health Insights · Ghana

This study in Kumasi, Ghana, assessed heavy metal concentrations in lettuce and spring onion cultivated at anthropogenic urban sites. It found that mean concentrations of nickel in lettuce (137.15 ± 0.0231 mg/kg) and spring onion (173.55 ± 0.02 mg/kg) at BSGS, and zinc in both vegetables across most sites, exceeded WHO/FAO permissible levels. Furthermore, the cancer risk factor for nickel in both lettuce and spring onion exceeded the benchmark of 1 × 10−6, indicating a potential increased cancer risk for consumers from long-term consumption.

Luke Beesley, Michael Hardman · Cities · Global

This opinion piece discusses the potential risks of urban agriculture (UA) practices within Green Social Prescribing (GSP), particularly in post-industrial regions. It highlights barriers related to heavy metal-enriched urban soils, emphasizing the need for greater awareness and management of these risks. The piece provides recommendations for improving knowledge exchange on urban soils and risk in GSP contexts.

Almou Abdoulaye Alio, Alio Sanda Abdel-Kader, Alio Fody Mahamadou, Chaibou Yaou, Rabiou Mamane Moustapha, Hamidou Djelifa, SOUMANA SOUROUNDA Idé, Mahamane Idi Issa Abdoulahi, Lewamy Mamadou, Haoua Sabo Seini, Hassimi Sadou · Asian Journal of Biology · Niger (Niamey)

This study assessed the impact of irrigation water on the bacteriological quality of lettuce in three market garden sites in Niamey, Niger. Analysis of 18 lettuce and 29 irrigation water samples revealed high contamination across all sites with various bacteria, including total coliforms, fecal coliforms, enterobacteria, and E. coli. The irrigation water quality was found unsuitable for irrigation, significantly contaminating the lettuce and posing potential health risks to consumers.

Lee D. Bryant, Roy Maconachie, Bastian Schnabel, Abubakarr Swaray, Howard Gigi, Solomon Gbanie, Kabba Haroun Bangura, Anthony Kamara, Prince Antwi-Agyei · Water Science & Technology Water Supply · Sierra Leone (Freetown)

This paper examined the environmental health status of three urban and peri-urban agriculture (UPA) sites in Freetown, Sierra Leone. Qualitative and quantitative data revealed heavy metal concentrations significantly exceeding regulatory limits in sweet potato leaves and arable soil. Additionally, soaring levels of faecal coliform bacteria were found in irrigation water, and crops were identified as hyperaccumulators for environmental contaminants.