A critical component of lithium-ion batteries in smartphones, laptops, and electric vehicles, cobalt creates serious health risks for artisanal mining communities in the DRC and e-waste recycling workers, with environmental contamination in mining regions measurably affecting child health.
Where it's found
Lithium cobalt oxide (LiCoO₂) cathodes in lithium-ion batteries — the dominant power technology for smartphones, tablets, laptops, and a significant fraction of electric vehicles. Approximately 70% of global cobalt is mined in the Democratic Republic of Congo, much of it under artisanal and small-scale mining (ASM) conditions with severe occupational health consequences. Consumer devices during normal use present negligible direct cobalt exposure. Cobalt compounds are released when batteries are damaged, punctured, or subjected to fire or informal thermal recycling. Environmental contamination around mining sites creates community-level soil and water exposure.
Routes of exposure
For mining communities and workers: inhalation of cobalt-containing dust during artisanal mining, crushing, and processing operations — often without respiratory protection. Dermal contact with cobalt-contaminated soil and water. Dietary intake from crops grown on contaminated agricultural land near mining operations. For consumers and e-waste workers: inhalation during informal battery dismantling, crushing, or burning. For the general population: dietary cobalt from food (as trace element — essential in B12 form) is the primary route; cobalt from electronics is not a significant consumer exposure under normal use conditions.
Health concerns
Cobalt dust and fumes cause hard metal lung disease — cobalt-induced interstitial pulmonary fibrosis — and occupational asthma in manufacturing and mining workers. Cobalt is classified as a possible human carcinogen (IARC Group 2B). In DRC mining communities, elevated urinary cobalt is associated with neurological symptoms, thyroid abnormalities, and developmental effects in children — studies in Katanga Province document blood cobalt in children hundreds of times higher than reference levels. Contact dermatitis and systemic cobalt toxicity at high doses include polycythaemia and thyroid disruption.
Evidence
Occupational lung disease from cobalt inhalation is thoroughly established. Community health impacts in DRC mining regions are documented by multiple independent academic and NGO research groups with biomonitoring data. Consumer exposure during normal device use is effectively nil — the harm is concentrated in the extractive and disposal phases of the device lifecycle. This makes it a supply chain and global justice issue as much as a personal health one.
Who's most at risk
Children in artisanal mining communities — particularly in southern DRC — face the highest exposures and most severe developmental consequences. Artisanal miners, predominantly young adults, face direct occupational inhalation. E-waste recycling workers in informal sectors globally. People with thyroid conditions may be more susceptible to cobalt-induced thyroid disruption.
Regulatory status
RegulationEU REACH restricts cobalt compounds in certain consumer products. EU Battery Regulation (2023) introduces due diligence, carbon footprint, and recycling requirements for cobalt in batteries. UK and US have supply chain transparency requirements for some manufacturers under conflict minerals frameworks. Formal WEEE recycling channels apply appropriate controls; informal recycling is unregulated.
How to reduce your exposure
Ensure old devices and batteries are recycled through certified WEEE and battery collection facilities rather than general waste — this protects recycling workers. Avoid puncturing, crushing, or exposing lithium-ion batteries to heat. Choose device manufacturers with independently audited, transparent cobalt supply chains. Support battery take-back schemes. Extending device lifetimes reduces overall cobalt demand and associated mining impacts.
The nutrition connection
Cobalt is an essential trace element — it forms the core of vitamin B12 — but excess cobalt from industrial sources causes harm through entirely different pathways from nutritional deficiency. Adequate dietary B12 from meat, fish, dairy, or supplements ensures cobalt is obtained in its biologically safe form. Iodine adequacy supports thyroid resilience against cobalt-induced thyroid disruption — another example of how nutritional sufficiency is protective against environmental chemical effects.