Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
Theme
Critical findings
319 results(2 / 13)
Investigation of inorganic nutrients and pollutants in private gardens in central Germany using citizen science
2025Christoph Koch, Maria da Glória Arrais Peter · Environmental Challenges · Germany
This citizen science study analyzed inorganic pollutants in private garden soils in central Germany, including front and backyards. Elevated levels of lead and copper were found in one-third of the samples, and zinc in two-thirds. Chromium and nickel concentrations were also elevated in a quarter of the samples, with some readily available substances exceeding limit values.
Contamination & food safetyCommunityHealthDistribuição Espacial de Chumbo em Mangifera indica e Syzygium malaccense em uma Cidade de Médio Porte, Colômbia
2025Christian Valderrama, Hernan Zarate · Ambiente & sociedade · Colombia (Neiva)
This research characterized the presence and spatial distribution of lead (Pb) concentrations in Mangifera indica and Syzygium malaccense fruit trees on public roads in Neiva, Colombia. Using a census, fruit sampling, and spatial interpolation methods, lead levels were detected in all samples. Five samples exceeded the permissible limit of 0.1 mg/kg, with higher concentrations observed in industrial areas.
Contamination & food safetyHealthFood sovereignty & justiceBuilding evidence regarding nature-based solutions indicators and their implications for policy – the case of air quality
2025Corina Başnou, Geovana Mercado, Åsa Ode Sang, Thomas B. Randrup, Verónica Fabio, Adrián Cabezas, Arnau Lluch, Marc Montlleó, Juan Miguel Kanai, Riccardo Saraco, Olívia Bina, Tom Wild · Nature-Based Solutions · Europe
An overview and guidance for air pollution indicators in nature-based solutions (NBS) for urban green planning and public health were provided, using three case studies in Europe and Latin America. The study noted that approaches including multidimensional indicators in research, planning, and policies are limited, and national standards for some air pollutants are missing with little evidence for health effect thresholds. Findings also indicated that knowledge of pollutant uptake in edible plants can suggest potential human exposure risks.
Contamination & food safetyHealthPolicyClimate changeUncontrolled urban vegetable farming poses public health risks in Ethiopia
2025Taffere Addis, Sisay Ketema, Abayneh Melaku · Frontiers in Water · Ethiopia (Addis Ababa)
This study in Addis Ababa, Ethiopia, investigated trace metal levels in sediment, soil, and irrigated vegetables from farms along the Akaki River, evaluating public health risks. Sediment levels of arsenic, chromium, copper, nickel, lead, and zinc exceeded threshold effect levels. Soil levels of arsenic, chromium, copper, manganese, and zinc exceeded typical world soil values, with nickel at one site exceeding EEC limits for agricultural soils. Critically, arsenic, lead, and zinc levels in some vegetable samples were above WHO allowable limits, despite soil levels being acceptable, and cadmium was the most accumulated metal in vegetables.
Contamination & food safetyHealthUrban–rural linkageMultidrug resistance in bacteria associated with leafy greens and soil in urban agriculture systems
2025E. Ryan Harrelson, Qingyue Zeng, Mairui Gao, Magaly Toro, Ryan A. Blaustein · Frontiers in Plant Science · United States (Washington, D.C.)
This study analyzed 87 multidrug-resistant (MDR) bacterial strains from leafy greens (n=29), root zone soil (n=42), and bulk soil (n=16) in Washington, D.C. urban agriculture systems using whole genome sequencing. The isolates, spanning 4 phyla and 14 genera, carried diverse antimicrobial resistance genes (ARGs) and mobile genetic elements (MGEs). The results indicate that MDR bacteria are present in urban agriculture systems, including on fresh produce, dominated by soil-associated taxa carrying diverse ARGs and MGEs, which suggests implications for resistance mobilization.
Contamination & food safetyHealthCommunityCadmium and lead pollution in environmental and food matrices in Kakamega Town of Kenya highlighting risks in rapidly urbanizing regions of Africa
2025Doreen N. Meso, Enos W. Wambu, Gelas Simiyu, Shem M. Mwasi, Thomas Munyao · Discover Environment · Kenya (Kakamega Town)
This study assessed heavy metal pollution in agricultural soils, water, and pumpkin leaves from 21 sites across three zones in peri-urban Kakamega Town, Kenya. It found cadmium pollution in all water samples, and lead and nickel pollution in sections of soil and leafy vegetable samples. Lead pollution was linked to vehicular emissions near the town center, while cadmium enrichment in informal settlements implicated inadequate waste management. Sequential extraction showed 31–35% of soil cadmium was in exchangeable fractions, posing a risk of bioavailability, highlighting persistent heavy metal contamination with implications for public health, environmental sustainability, and agricultural productivity.
Contamination & food safetyHealthPeri-urban agricultureQuality of Constructed Technogenic Soils in Urban Gardens Located on a Reclaimed Clay Pit
2025Dariusz Gruszka, Katarzyna Szopka, Cezary Kabała · Land · Poland (Wroclaw)
This study in Wroclaw, Poland, investigated the quality of constructed technogenic soils in urban gardens located on a reclaimed clay pit. Despite beneficial physicochemical properties and high fertility in the topsoil layers, the soils were seriously contaminated with trace elements, including zinc (up to 1700 mg kg−1), lead (920 mg kg−1), copper (740 mg kg−1), cadmium (5.1 mg kg−1), mercury (7.4 mg kg−1), and arsenic (5.1 mg kg−1). This contamination, likely from industrial and urban waste used for mine infilling, compromises soil quality and poses potential health and ecological risks.
Contamination & food safetyHealthIdentification of the pollution sources and hidden clustering patterns for potentially toxic elements in typical peri-urban agricultural soils in southern China
2025Haofan Xu, Peng Hu, Hailong Wang, Peter Croot, Zhiwen Li, Cheng Li, Shaowen Xie, Hongyi Zhou, Chaosheng Zhang · Environmental Pollution · China
This study in Gaoming county, China, integrated PMF and K-means clustering to identify sources and contamination patterns of 8 potentially toxic elements (PTEs) in peri-urban agricultural soils. Average concentrations of PTEs were reported, with PMF identifying geogenic, industrial/traffic-related, and agricultural sources. The highest PTE concentrations were found in urbanized zones, confirming significant human impact and underscoring the dual influences of agriculture and urbanization on PTE contamination.
Contamination & food safetyPeri-urban agricultureHealthFarmer awareness of heavy metal contamination in urban roadside vegetables along the Accra–Tema motorway, Ghana
2025Ebenezer Boahen · Discover Agriculture · Ghana
This study assessed the awareness and practices of 50 purposively selected vegetable farmers along the Accra-Tema Motorway, Ghana, regarding heavy metal contamination from vehicular emissions and its potential health implications. Data were collected through structured questionnaires and one-on-one interviews. Results showed that 96% of the farmers were unaware of heavy metal contamination, though 80% expressed a willingness to discontinue farming near the motorway if they were informed of the risks. Farmers face challenges such as limited access to clean irrigation water and dependence on informal agricultural knowledge. The study highlights the urgent need for targeted educational interventions to raise awareness about the risks of heavy metal exposure and to encourage safer farming practices.
Contamination & food safetyHealthEconomicsFood sovereignty & justicePilotstudie zu urbanem Gärtnern: Schadstoffgehalte in Nahrungspflanzen in Straßennähe/Pilot study on urban gardening: Pollutant levels in food plants near roads
2025Katja Hombrecher · Gefahrstoffe Reinhaltung der Luft · Germany
A pilot study in Germany investigated the impact of road traffic emissions on food plants grown near roads. Bioindicators like kale, chard, Lollo Rosso, and lettuce were exposed for four weeks at four roadside locations and compared to plants in a garden away from roads. While pollutant levels generally did not exceed background or EU maximum limits, significant traffic-related inputs of PAK 4, antimony, aluminum, chromium, and vanadium, and lesser inputs of copper, iron, and lead were detected compared to the control. The findings indicate a potential contamination risk for certain vegetable plants from road traffic.
Contamination & food safetyHealthUrban–rural linkageHydrochemical Characterization and Water Pollution Indices of Groundwater in Urban Farming Areas: The Case of the Municipality of Man, Western Côte d'Ivoire
2025YAO, 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.
Contamination & food safetyHealthOrganic cycleLead Contamination Propagation into Plants of a Metro Atlanta Home
2025Carithers, Jaci, Gowen, Samantha, Jenney, Francis · Digital Commons - PCOM (Philadelphia College of Osteopathic Medicine) · United States (Atlanta)
A study in a Metro Atlanta residence, United States, analyzed lead contamination in soil and plant samples using inductively coupled plasma mass spectrometry (ICP-MS). The research found substantial lead contamination, particularly in areas where crops were grown. Results demonstrated the propagation of lead from contaminated soil into local vegetation over time, with an average level of 143.9 mg/kg, ranging from 5.1 mg/kg to 499.5 mg/kg.
Contamination & food safetyHealthDIYGenomics and Network Analysis of Multidrug-Resistant Shigella flexneri from Raw Vegetables in Bangladesh for Risk Assessment and Targeted Therapeutic Intervention
2025K 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.
Contamination & food safetyHealthContamination level and dietary risk assessment of trace elements in Brassica pekinensis Lour. from gardening areas under tropical conditions
2025Anaïs 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.
Contamination & food safetyHealthPrevalence of Antibiotic Resistance Bacteria in Manure, Soil, and Vegetables in Urban Blantyre, Malawi, from a Farm-to-Fork Perspective
2025Amon 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.
Contamination & food safetyHealthOrganic cycleHeavy metal contamination and remediation strategies in peri-urban agricultural soils
2025Laxman Barua, YOGITA ADHIKARI, Kuldeep Naik · International Journal of Agriculture and Nutrition · India (Prayagraj)
This research assessed heavy metal concentrations in agricultural soils near the Naini industrial area in Prayagraj, India, and evaluated remediation strategies. Lead and cadmium concentrations at 0.5 km from the industrial zone exceeded Indian permissible limits (Pb: 67.8 mg/kg vs 50 mg/kg; Cd: 6.4 mg/kg vs 5 mg/kg). A pot trial showed that Brassica juncea removed 34.7% of Pb and 41.2% of Cd, while lime + biochar reduced Pb by 52.4%. A combined approach reduced bioavailable Pb to below the permissible limit.
Contamination & food safetyPeri-urban agricultureHealthOrganic cyclePortable X-ray fluorescence as a tool for urban soil contamination analysis: accuracy, precision, and practicality
2025E.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.
Contamination & food safetyHealthUrban–rural linkageIdentifying priority control factors for heavy metal pollution in urban agricultural soils of the Chengdu Plain: An integrated multi-model approach
2025M. J. Ni, Shuai Yan, Ting Li, Zijun Zhou, Xiaojing Liu, Shirong Zhang, Guiyin Wang, Xiaoxun Xu, Yulin Pu, Yongxia Jia, Lan Li · Ecotoxicology and Environmental Safety · China (Chengdu)
This study investigated heavy metal (HM) contamination in urban and peri-urban agricultural soils of the Chengdu Plain, China, using an integrated multi-model approach. Four major HM sources were identified, including natural (30.0%), mixed agricultural and transportation (29.5%), metal smelting (19.4%), and atmospheric deposition (21.1%). Risk assessments revealed that Cd and Hg posed the highest ecological risks, and human health risk assessment indicated unacceptable health risks for children, with non-carcinogenic and carcinogenic risk probabilities reaching 4% and 10% respectively.
Contamination & food safetyHealthUrban–rural linkageAssessment of heavy metal pollution on agricultural land in Chengdu city under different anthropogenic pressures based on APCS-MLR modelling
2024Yizhou Peng, Grigorieva Iya Yu · Ecological Indicators · China (Chengdu)
This study assessed heavy metal pollution in rural, urban-rural interface, and urban agricultural lands in Chengdu, China. It found varying degrees of heavy metal pollution across all areas, with arsenic (As) and cadmium (Cd) being the most severe pollutants. Concentrations of As and Cd in soil samples exceeded risk thresholds, and these elements showed high spatial variability, indicating significant anthropogenic influence. Pollution sources included livestock manure, natural sources, agricultural activities, and industrial activities in urban areas.
Contamination & food safetyHealthUrban–rural linkageFood sovereignty & justiceThe Extraction and Characterization of Microplastics of Biocompost and Water Samples Collected from the Different Semi-Urban Agronurseries
2024Roopika Sivaraman, Haritha Thulaseedharan Nair, Sharmila Krishnan, Perumal Siddhuraju · Soil and Sediment Contamination An International Journal · India (Coimbatore)
This study analyzed biocompost and water samples from four agricultural nurseries in semi-urban Coimbatore, India, for microplastic contamination using density separation and ATR-FTIR. While physicochemical properties met Indian standards, microplastic fragments (85%) and fibers (15%) were found in two biocompost samples (BC-B and BC-C), identifying PMMA, PP, and EVA polymers. No microplastics were detected in samples BC-A and BC-D, but the findings suggest semi-urban agricultural gardening may contribute to microplastic accumulation in terrestrial environments, potentially harming soil and plant health.
Contamination & food safetyCompostOrganic cycleHealthQualidade Microbiológica no Cultivo de Plantas Alimentícias e Medicinais Produzidas em uma Horta Urbana de uma Instituição de Ensino
2024Beatriz Barbosa da Silva, Caroline Senatore, Manueli Monciozo Domingos, Jackline Freitas Brilhante de São José · Ensaios e Ciência C Biológicas Agrárias e da Saúde · Brazil (Vitória)
From March to May 2023, the microbiological quality of food and medicinal plants, soil, and irrigation water was evaluated in an urban garden at an educational institution in Vitória, Brazil. 16.6% (n=2) of the analyzed plants exceeded legal limits for total coliforms at 35ºC, and Salmonella spp. was detected in 41.6% (n=5) of plants. Salmonella spp. was also found in 80.0% (n=4) of soil samples, suggesting a potential source of plant contamination.
Contamination & food safetyHealthFood educationImpact of zinc on arbuscular mycorrhizal-mediated nutrient acquisition in urban horticulture
2024Miles 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.
Contamination & food safetyHealthOrganic cycleClimate changeMapping wild food foraging locations reveals urban green space preferences and avenues for edible city solutions
2024Anjoulie 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.
Contamination & food safetyCommunityBiodiversityHealthPolicyChallenges of Urban Agricultural Production from the Aspects of Plant Protection and Food Safety
2024Dragana 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.
Contamination & food safetyHealthPeri-urban agricultureDIYDesigning healthy edible cities: investigating the environmental and spatial factors affecting urban fruit safety
2024Mohammad 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.
Contamination & food safetyHealth