Research & reports
Peer-reviewed research and reports on community urban agriculture, food education, composting, welfare and more.
Theme
Critical findings
17 results
Potentially Toxic Elements in Foods Consumed in Uganda: Occurrence, Dietary Exposure, and Public Health Risks
2026Gabson Baguma, Gadson Bamanya, Allan Gonzaga, Hannington Twinomuhwezi, Barnabas Mubangizi, Eric Niringiyimana · Pollutants · Uganda
This review synthesized literature on the occurrence of cadmium, chromium, nickel, lead, and arsenic in foods consumed in Uganda. Contamination was concentrated in mining-influenced agricultural areas, wastewater-irrigated farms, municipal dumpsites, industrial corridors, and urban food markets, with vegetables, cereals, livestock products, fish, and street-vended foods exhibiting the greatest contamination burdens. Lead and cadmium most frequently exceeded WHO/FAO, Codex Alimentarius, and Ugandan food safety limits, and children consistently showed higher dietary exposure than adults.
Contamination & food safetyHealthUrban–rural linkagePortable 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 linkageUrban Agriculture & Regional Food Systems Special Section: Improving Livability in Urban Areas: Examining Urban and Peri‐Urban Soil and Plant Management
2024Roberta 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.
Contamination & food safetyUrban–rural linkageBiodiversityPolicyHealthHEAVY METALS IN FOOD CROPS: IDEAL SOURCES AND ROLES OF URBAN AGRICULTURE IN FACILITATING THEIR CONSUMPTION- A REVIEW
2021Nazir Muhammad Abdullahi, Ernest Chukwusoro IGWE, Munir Abba Dandago, Naima Umar · FUDMA Journal of Sciences · Global
This review discusses heavy metal contamination in food crops, identifying wastewater irrigation, agrochemical abuse, contaminated fields, atmospheric deposition, and unethical mining as primary sources. Agricultural soil in urban and peri-urban areas is heavily contaminated due to anthropogenic activities, with wastewater irrigation intensifying this contamination. Heavy metals are transferred to food crops during production and subsequently to humans upon consumption, posing a detrimental risk.
Contamination & food safetyHealthUrban–rural linkagePolluted Waters Use in the Urban Agriculture and Its Impact on the Quality of the Grown Vegetables
2020Fabien Ilunga Mpanga, Michel Shengo Lutandula⃰ · The Global Environmental Engineers · Democratic Republic of Congo (Lubumbashi)
A study conducted in the Kasungami district of Lubumbashi, Democratic Republic of Congo, investigated the link between the use of polluted waters in urban agriculture and heavy metal contamination in soil and cultivated vegetables (amaranths, broccolis). Physicochemical and mineral analyses of water, soil, and plant samples revealed that heavy metals, except cobalt, were present in the water used for urban agriculture at concentrations below quality standards, but the soil contained heavy metals at phytotoxic concentrations. Only broccolis were contaminated with lead, while amaranths had heavy metals below quality standards. These findings suggest that urban agriculture in large agglomerations of the DRC could endanger consumers' health.
Contamination & food safetyHealthUrban–rural linkageПотенциални рискове от замърсяване на производството при земеделие в градска среда
2020Милена Йорданова, Вера Петрова, Цветелина Николова, Елена Цветкова, Milena Yordanova, Vera Petrova, Tsvetelina Nikolova, Elena Tsvetkova · Bulgarian Portal for Open Science · Global
This article considered the potential risks of contamination in urban agricultural products. Urban agriculture, particularly in large cities, areas with heavy traffic, or near industrial zones, can lead to the accumulation of heavy metals in vegetable crops due to air pollution, traffic pollution, and other sources. Consuming these contaminated fresh vegetables is noted to potentially deteriorate human health.
Contamination & food safetyHealthUrban–rural linkageAtmospheric sources of trace element contamination in cultivated urban areas: A review
2020Salvatore Engel‐Di Mauro · Journal of Environmental Quality · Global
This review examines atmospheric sources of trace element (TE) contamination in cultivated urban areas (CUAs), noting that these sources are understudied and poorly understood despite extensive research on TE contamination in CUAs. Existing research often assesses atmospheric deposition indirectly or lacks controls for other TE contaminants, and shows little engagement with atmospheric sciences methodological guidelines, which reduces confidence in current findings. The review suggests combining atmospheric science techniques with existing robust methodologies for TE contamination studies in CUAs.
Contamination & food safetyHealthUrban–rural linkageInfección por Angiostrongylus cantonensis (Nematoda: Metastrongylidae) en Rattus rattus (Rodentia: Muridae) en una localidad de La Habana, Cuba
2019Ariamys Companioni, Jennys Peraza, Zulema Menéndez Díaz, Aileen González, Ledy X López, Ana Elisa Rodriguez, Jorge Cantillo, Fidel Ángel Núñez · Dialnet (Universidad de la Rioja) · Cuba
A descriptive study in La Lisa Municipality, Havana, Cuba, examined 63 Rattus rattus rodents for Angiostrongylus cantonensis infection in an urban farm field. The study found that 46.03% of the captured rodents were infected with A. cantonensis, with infection rates increasing in adult individuals (59.46%) and during the rainy season (55.88%). This demonstrated the circulation of A. cantonensis in its definitive host in the area, indicating an increased risk of transmission to humans.
Contamination & food safetyHealthUrban–rural linkageGeostatistical Analysis Of Contamination Of Soils In An Urban Area In Ghana
2018Simon Kojo Appiah, Eric Nimako Aidoo, Derrick Asamoah Owusu, M. W. Nuonabuor · Zenodo (CERN European Organization for Nuclear Research) · Ghana (Kumasi)
This paper assesses the spatial distribution of heavy metals and potential ingestion risks in Kumasi, Ghana, using geostatistical techniques on topsoil samples. Results from univariate and multivariate semivariogram models showed strong spatial dependence with autocorrelations ranging from 100 to 300 meters. The produced risk maps indicate strong spatial heterogeneity for most soil heavy metals, with extremely high contamination risk found near commercial areas.
Contamination & food safetyHealthUrban–rural linkageIdentifying the potential of some heavy metals toxicity in urban and peri-urban cropping systems in Sierra Leone
2017Abdul Rahman Conteh, Alusaine Edward Samura, E. L. S. Hinckley, Osman Nabay, Mohamed S. Kamara · Journal of Agricultural Science and Practice · Sierra Leone (Freetown)
This study was conducted to identify the risks of heavy metal contamination in urban and peri-urban cropping systems in Sierra Leone. Soil and plant samples were collected from 72 sites in Freetown and Bo and analyzed for Zn, Cu, Cr, Ni, Pb, and Cd. Heavy metals were detected across all sites, and some mild risk of cadmium toxicity was observed in densely populated areas of Freetown, though this was not reflected in plant uptake of cadmium.
Contamination & food safetyHealthUrban–rural linkageWelfareWastewater use in urban agriculture: an exposure and risk assessment in Accra, Ghana
2016P. Antwi Agyei, Jeroen H. J. Ensink · Journal of Science and Technology (Ghana) · Ghana (Accra)
A study in Accra, Ghana, from September 2012 to August 2013, analyzed 323 soil and irrigation water samples and 501 produce samples for E. coli, and interviewed 693 participants. It found irrigation water was significantly more contaminated than farm soil, and over 80% of produce samples were contaminated with E. coli, with street food salad being the most contaminated. Key risk factors included farm soil, wastewater use, and poor hygiene, while consumers did not prioritize health indicators despite high risk awareness.
Contamination & food safetyHealthPolicyUrban–rural linkageA faecal exposure assessment of farm workers in Accra, Ghana: a cross sectional study
2016Prince Antwi-Agyei, Adam Biran, Anne Peasey, Jane Bruce, Jeroen H. J. Ensink · BMC Public Health · Ghana (Accra)
This cross-sectional study in Accra, Ghana, assessed faecal exposure among 80 farm workers during dry and wet seasons, analyzing water and soil samples for E. coli. The results showed that while irrigation water was highly contaminated (5.6 Log E. coli/100 ml), exposure to farm soil (2.3 Log E. coli/g) was the key risk pathway due to soil-to-mouth events, with 53% of farmers experiencing such events daily. The estimated norovirus infection risk to farmers was found to be higher than guidelines set by the WHO, indicating that exposure to soil is a critical pathway of pathogen risk in wastewater farmers, exceeding recommended health targets.
Contamination & food safetyHealthUrban–rural linkagePolicyA Scoping Review of Heavy Metal Contamination in Urban Market Vegetables and Biomarker Evidence of Consumer Exposure in Kinshasa, Democratic Republic of the Congo: An African Perspective, 2014
2014Abdirahman Osman Warsame, Fadumo Abdi Mohamud, Ahmed Hassan Ali · Zenodo (CERN European Organization for Nuclear Research) · Democratic Republic of the Congo (Kinshasa)
This scoping review synthesized evidence on the association between heavy metal contamination in vegetables sold in Kinshasa's urban markets, Democratic Republic of the Congo, and human biomarkers of consumer exposure. Available evidence consistently showed that vegetables, particularly leafy greens, from Kinshasa markets contained elevated levels of lead and cadmium, often exceeding international safety limits. However, studies directly linking vegetable contamination with human biomarkers are notably scarce, suggesting a potential exposure pathway but not establishing definitive causation.
Contamination & food safetyHealthUrban–rural linkageNIVELES DE CADMIO, PLOMO, COBRE Y ZINC EN HORTALIZAS CULTIVADAS EN UNA ZONA ALTAMENTE URBANIZADA DE LA CIUDAD DE LA HABANA, CUBA
2013Susana Olivares Reumont, Damarys García Céspedes, Lázaro Lima Cazorla, Israel Saborit Sánchez, Axel Llizo Casals, Pedro Pérez Álvarez · Revista Internacional de Contaminación Ambiental · Cuba (Havana)
This study investigated levels of Cu, Pb, Cd, and Zn in soils and vegetables from 17 urban agriculture farms around the "Calle 100" landfill in Havana, Cuba, during 2006-2007. Findings showed that 35% of soils exceeded typical Cuban agricultural ranges for Zn, and 52% for Pb. Critically, 23% of soils surpassed phytotoxic and international limit levels for Pb, and 12.5% of vegetable samples exceeded Cuban maximum permissible limits for Pb in food for human consumption. The results indicate a need for strict monitoring of horticultural crops in the area due to contamination.
Contamination & food safetyHealthUrban–rural linkagePolicyForms of Lead in Profiles of Differently Use Soil
2012Iwona Makuch · Soil Science Annual · Global
This study investigated the influence of intensive horticulture on lead content and its fractions in soil profiles from house gardens, allotment gardens, and arable fields. It was not determined that the manner of usage had any influence on total lead content or its distribution in soil profiles. However, the usage manner did influence the content and distribution of lead fraction III, which is connected with organic matter, with humus horizons of garden soils showing the highest content.
Contamination & food safetyHealthCommunityUrban–rural linkageReducing risk from wastewater use in urban farming – A case study of Accra, Ghana
2009Pay Drechsel, Liqa Raschid-Sally, Robert Clement Abaidoo · · Ghana (Accra)
Urbanization in West Africa has led to most domestic wastewater contaminating surface water sources. In Accra, Ghana, vegetables on urban markets are highly contaminated, with about 200,000 urban dwellers consuming street food containing raw vegetables from these sources daily. This research explores on-farm risk mitigation options, finding potential to significantly reduce helminth egg counts and bacterial contamination through improved washing practices.
Contamination & food safetyHealthUrban–rural linkageWastewater use for urban and peri-urban agriculture.
2006Stephanie Buechler, Gayathri Devi Mekala, B. Keraita · Victoria University Research Repository (Victoria University) · Global
This 2006 global study from Victoria University discusses wastewater use in urban and peri-urban agriculture for crop production and aquaculture, noting its role in generating livelihoods and providing cheap produce. However, the study emphasizes that clear policy guidelines and careful research are needed to prevent potential negative impacts on human health and the environment from wastewater reuse.
Contamination & food safetyUrban–rural linkagePeri-urban agricultureHealthPolicyEconomics