Research & reports

Mohamed Haythem Msaddek, Mohsen Ben Alaya, Lahcen Zouhri, Yahya Moumni, Bilel Abdelkarim · Water · Global

This study developed a Geo-AI ensemble modeling framework to assess groundwater contamination dynamics in peri-urban agricultural aquifers. Applied to the Manouba aquifer in Tunisia using 295 samples from 85 wells (2005-2025), the spatial analysis revealed severe contamination expanded from 7% of the study area in 2005 to 55% in 2025. Urban expansion and agricultural intensification were found to reduce recharge, increase pollutant loading, and accelerate contaminant accumulation.

Ndiaye Awa, Diallo Ibrahima, Dieng Amadou, Ba Ibrahima, Sembene Mbacke · African Journal of Environmental Science and Technology · Senegal

This study in Dakar, Senegal, assessed Salmonella contamination in irrigation water and lettuce across three urban agricultural sites. Sites using wastewater (Pikine and Patte d’Oie) showed high Salmonella prevalence in water (70-90%) and vegetables (20-80%), while a tap water site (Lendeng) had no contamination. Market-sourced lettuce also tested positive (28.57%), indicating public health risks from untreated wastewater use.

Réné Kasende Disashi, Belloty Mundadi Ngeteke, Dorcas Sola Tabitha, Prescilia Mabubu Pembe, Fanny BAKOMBA KIKOBO, Denise OKITO WIKANU, Esther MPIANA MUKANIA, Sarah Kinsona Bombili, Esther Kimpala Karuna, Clément Munganga Kilingwa, Rosie Mubindukila Nzamba · European Scientific Journal ESJ · Congo (Kinshasa)

A study conducted from June 10 to July 20, 2025, in peri-urban market gardens of Kimwenza and Ndjili Cecomaf in Kinshasa, Democratic Republic of Congo, surveyed 68 market gardeners on the use of prohibited and unauthorized pesticides. The findings revealed an alarming reliance on informal supply channels, with six out of 27 identified pesticides being formally prohibited. Despite 94.3% of gardeners acknowledging risks, only 9.6% used full protective equipment, and 32.7% took no precautions.

Nelson Joseph Msacky, Amelia Alfred, Oscar Punguti, Edson Protas, Iddi Mapande, Novatus, Shukrani Phillip, January G Msemakweli · Open MIND · Global

This systematic review aims to synthesize current scientific evidence on the effectiveness of fruit-waste-derived biochar in immobilizing potentially toxic elements (PTEs) in contaminated agricultural soils. It will evaluate how fruit-waste biochar reduces metal bioavailability, plant uptake, and associated human health risks from vegetable consumption. The review also seeks to identify which fruit wastes are used as biochar feedstocks and which biochar properties and production conditions influence immobilization performance, noting that existing research is fragmented.

Hajra Kanwal, Qudrat Ullah, Waqas Haider, Mujahid Farid, Zaki Ul Zaman Asam, Muhammad Zubair, Abdulrahman Alasmari, Sarah Owdah Alomrani, Muhammad Munir, Shafaqat Ali · Open MIND · Global

This study investigated the interactive effects of contaminated wastewater with cadmium, mercury, lead, and polyethylene microplastics from exfoliating personal care products on chili plants (Capsicum annuum). Plant growth parameters were reduced by 71–82% at high wastewater and microplastic levels, accompanied by significant losses in photosynthetic pigments and soluble proteins. Oxidative stress markers increased by 124–230%, and heavy metal uptake was significantly increased, facilitated by microplastics.

Paula Marques Crelier, Manoel Jerônimo Moreira Cruz, Danusia Ferreira Lima · Seven Editora eBooks · Global

A controlled laboratory experiment cultivated BRS Leila lettuce (L. sativa) in samples contaminated with lithium carbonate (Li₂CO₃) at concentrations of 150 and 200 mol/L. The study found that lithium correlates with other alkaline and alkaline earth elements in the leaves and roots of the lettuce. This indicates a contamination pathway where lithium is absorbed by the plant.

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.

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.

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.

Mansi I. Bhati and R.K. Dubey · Zenodo (CERN European Organization for Nuclear Research) · Global

Urban horticulture, a new concept for growing family-sufficient food in urban and peri-urban areas, is gaining importance. However, environmental challenges for urban farming in urban environments include soil contamination, micro-climate alteration and air pollution, and contaminated water resources. Appropriate guidelines for urban and peri-urban agricultural practices are required.

Naoual Zerrari, Naoual Raïs, Mustapha Ijjaali · Soil and Sediment Contamination An International Journal · Morocco (Fez)

Nine soil samples from agricultural soils in Fez-Upstream, Morocco, were analyzed to assess concentrations of major elements, Rare Earth Elements (REEs), and heavy metals. The soils were enriched by light REEs, and the contamination factor and degree of contamination indicated moderate and low contamination, respectively. However, all sampling sites showed PLI values above 1, indicating obvious anthropogenic pollution due to human activities.

Jihan Faouzi, Imane Bedoui, Sanae Rezouki, Tarik Moubchir, Aimad Allali, Noureddine Eloutassi, Amal Lahkimi · Ecological Engineering & Environmental Technology · Morocco (Fez)

This study in Fez, Morocco, compared bacteriological and parasitological contamination in urban, peri-urban, and rural irrigation waters, and their transfer to soil and crops (cardoon and eggplant). Investigated microorganisms included total and thermotolerant coliforms, helminth eggs, Salmonella, and cholera vibrio. Results revealed contamination exceeding national and international standards for both types of coliforms in treated wastewater (TWW), wastewater (WW), Oued Fez water, and upstream well water in both winter and summer. This fecal contamination was found in soils and crops irrigated by urban and peri-urban water. Helminth eggs and cholera vibrio were also present in these waters, soils, and crops, with Salmonella detected in TWW in summer. Only the plot irrigated with Oued Bitit water in the rural zone met standards across all three levels of irrigated water, soil, and plants, and in both periods.

Shwan Mohammed, P. K. Nyade, Mohamad Abdulhamid, I. O. A. Hodgson · Water Science · Ghana (Accra)

This study assessed urban water quality parameters of the Nima Creek in Southeastern Accra, Ghana, sampling water from six locations. The results showed high enrichment of nutrients (ammonia, nitrate, phosphate) and elevated levels of BOD, COD, and grease at sites receiving solid and liquid wastes. Physicochemical parameters like conductivity, TSS, and TDS also exhibited elevated values, indicating significant contamination that poses challenges for sustainable urban agriculture.

Camille Dumat · Aspects in Mining & Mineral Science · Global

This paper discusses the negative environmental and health impacts of mining, such as air and soil pollution, despite its socio-economic benefits. It highlights that urban agriculture, particularly in areas near former mining sites, faces challenges regarding soil quality and the production of unpolluted vegetables due to public concerns about contamination.

Tanmoy Roy Tusher, Md. Eusuf Sarker, Sumaya Nasrin, Tapos Kormoker, Ram Proshad, Md. Saiful Islam, Shamim Al Mamun, A. R. M. Tareq · Toxin Reviews · Bangladesh

This study investigated toxic metal and PAH contamination in rooftop soils and vegetables (red amaranth, spinach) in urban and peri-urban Bangladesh. Urban rooftop soil and vegetables were highly contaminated with toxic metals and PAHs compared to peri-urban samples. Lead (Pb) and cadmium (Cd) concentrations in urban vegetables exceeded safe limits. However, health risk indices indicated that the levels of toxic metals and PAHs in urban rooftop vegetables would not pose carcinogenic or non-carcinogenic health risks for adults and children, deeming them safe for consumption.

Razzaq Ahmed, Shaukat Khan, Khalida Mahmood, Ahsanullah · Irrigation and Drainage · Pakistan (Karachi)

Agricultural activities in the Gadap Basin, Karachi, Pakistan, showed a declining trend over two decades from 1997 to 2016. Analysis of 13 irrigation water samples revealed that water quality had severely degraded, with sodium concentration substantially increasing, especially near sand and gravel excavation sites. While 100% of samples were suitable for irrigation in 1997, this dropped to almost 50% by 2016, and SAR also decreased, indicating irrigation water quality degradation. Satellite imagery further showed a 60% decline and degradation of agricultural land in the basin during the same period.

Joseph Richmond Fianko, Mavis Korankye · West African Journal of Applied Ecology · Ghana

A study assessed the environmental and health impact of urban and peri-urban irrigated agriculture in Ghana by analyzing the physico-chemical and microbiological characteristics of irrigation water in the Greater Accra Region, calculating a comprehensive pollution index (CPI) and sodium adsorption ratio (SAR). Water samples used for informal irrigation contained significant microbial loads: total coliform ranged from 25×10² to 1209×10² cfu/100ml and E. coli from 2×10² to 651×10² cfu/100ml, with a mean total coliform level (517.917×10² cfu/100ml) far exceeding the recommended maximum guideline values of 5,000 and 1,000 cfu/100ml for irrigation water. CPI values ranged from 0.16 to 0.43 (average 0.27), indicating moderate pollution; about 42% of samples were classified as sodic waters, and SAR values of 3.42 to 24.75 meant nearly all samples exceeded the threshold (SAR > 4) associated with reduced water infiltration and soil permeability problems. The water is described as under persistent pollution pressure from expanding human activity, posing high risks to the health of the environment, farmers, traders, and consumers.

Camille Dumat, Antoine Pierart, Muhammad Shahid, Sana Khalid · · Global

Urban agriculture, while a strategy for sustainable food production, faces a serious threat from natural and anthropogenic pollution sources in urban and peri-urban environments. These sources release hazardous organic and inorganic contaminants, leading to a high likelihood of human exposure. Consumption of vegetables grown on polluted urban soils or those that have intercepted metal-rich atmospheric particles represents a potential route of pollutant exposure and human health hazard.

L.C. Obuseng · Botswana Journal of Agriculture and Applied Sciences · Botswana (Gaborone)

This review highlights the potential for heavy metal accumulation in soil and crops from urban and peri-urban agriculture (UPA) around Gaborone, Botswana, due to the intensive use of chemical fertilizers, pesticides, wastewater, sludges, and industrial effluents. A literature review showed that fertilizers contain heavy metals, and the use of treated or untreated sewage water by UPA farmers can lead to heavy metal accumulation in soil and crops, posing a danger to human health. Information on heavy metal accumulation in soils is limited in Botswana, despite high agrochemical use in UPA vegetable production.

Dan Li, Chun Hong Wong, Mei Fang Seet, Nicole Kuan · Frontiers in Microbiology · Singapore

This study conducted, for the first time to the authors' knowledge, an investigation of Stenotrophomonas maltophilia -- an emerging opportunistic pathogen capable of causing high-mortality nosocomial infections in immunocompromised patients while also being ubiquitous in the environment -- on leafy green vegetables and in a hydroponic farming facility in Singapore. Eleven isolates were recovered from three vegetable types (sweet basil, kale, parsley) and the nutrient solution, with high population levels reached in vegetables under abused storage temperatures (over 8-log CFU/ml in basil juice after six days at 20°C) and on hydroponic facilities through biofilm formation (8 to 9-log CFU/well), and UV treatment (over 4-log reduction at 250 mJ/cm²) was identified as an effective measure to reduce contamination in nutrient solutions and facilities.

Sandeep Kumar, Lal Chand Malav, ICAR- National Bureau of Soil Survey & Land Use Planning, Nagpur, 440033, Maharashtra, Shiv Prasad, Sunita Yadav, Amrita Daripa, ICAR- National Bureau of Soil Survey & Land Use Planning, Nagpur, 440033, Maharashtra · Agropedology · Global

This review argues that rapid industrialization and mechanization are driving heavy metal pollution worldwide, with both anthropogenic and natural sources of heavy metals reaching soil, water bodies and plants and ultimately entering the human body through the food chain. Heavy metals accumulate in plants and living organisms after uptake from soil and cause harm, and they are also toxic to soil biological activity by disrupting key microbial processes. The review states that, due to industrial development in urban areas, heavy metal contamination — from metals such as zinc, copper, lead and cadmium — has become a serious threat to the peri-urban agriculture that supplies vegetable production, and it surveys sources of contamination and remediation techniques, with a particular focus on phytoremediation.

P.S. Bouda, Edmond Hien, A. Dioma, Hyacinthe Kambiré, Yacouba Maïga, Der Adolphe Somé, Sylvie Nazaret, A.S. Ouattara · DOAJ (DOAJ: Directory of Open Access Journals) · Burkina Faso

A study in Ouagadougou sub-urban agricultural fields, Burkina Faso, assessed the impact of using untreated Solid Urban Wastes (SUW) as agricultural fertilizers on soil properties and crop production. SUW amendment significantly increased pH, total C, N, P, and available P, and maize height and biomass yield were 124% and 164% higher in amended plots, respectively. However, trace metal elements (Cu, Zn, Pb, Ni, Cr) concentrations were higher in amended fields, indicating that urban waste carries contaminants posing public health risks.

Muhammad Asif Khan Rai Muhammad Amir · International Journal of Biosciences (IJB) · Pakistan (Faisalabad)

To investigate heavy metal residue levels in cauliflower grown in the peri-urban area of Faisalabad district, Pakistan, 30 cauliflower samples were collected from 10 selected farmers. Analysis revealed variable heavy metal residue levels (nickel, lead, zinc, copper, arsenic, and mercury) in the samples, indicating that the cauliflower was contaminated with multiple heavy metals. This contamination is attributed to the use of untreated sewage water for cultivation, which is the single largest contributor to heavy metal accumulation in cauliflower.