How does lead poison children?

Lead is a potent neurotoxin that interferes with virtually every system in the body — but the developing brain is most vulnerable. Lead substitutes for calcium in neuronal signalling, disrupts synaptic development and causes permanent neurotoxicity. Even low BLLs cause: cognitive impairment (lower IQ, reading difficulties); behavioural problems (ADHD, aggression); reduced educational attainment; and — at higher levels — seizures, encephalopathy and death. There is no safe BLL.

Where does lead exposure come from?

The major sources of childhood lead exposure today: lead paint (deteriorating paint in older housing, renovation dust); lead in soil (from decades of leaded fuel exhaust, industrial emissions); unsafe lead-acid battery recycling (particularly in Africa and Asia); lead-contaminated spices (adulteration with lead chromate — found in turmeric and chilli powder); lead in traditional remedies (Ayurvedic and Chinese preparations); lead in food packaging, cookware and water pipes; and occupational exposure brought home on parents' clothing.

Is there a safe level of blood lead?

No — there is no safe level of blood lead. The CDC reference value (3.5 μg/dL) represents a level above which children have higher exposure than 97.5% of their peers — it is not a safety threshold. Research shows cognitive effects at BLLs as low as 1-2 μg/dL. WHO states explicitly: "There is no level of lead exposure that is known to be without harmful effects."

Was the leaded fuel phase-out successful?

Yes — the global elimination of leaded petrol (completed August 2021 when Algeria became the last country to sell it) is one of the great public health achievements. Leaded fuel was introduced in the 1920s and caused massive global lead contamination through exhaust emissions. Its elimination has dramatically reduced blood lead levels globally — US children's average BLL fell from approximately 15 μg/dL in 1978 to approximately 1 μg/dL today. However, legacy lead in soil and paint continues to expose children decades later.

What is the lead paint problem?

Lead paint on walls, ceilings, furniture and toys remains a major exposure source — particularly in housing built before lead paint bans (1978 in the US; later in most countries). Deteriorating lead paint creates fine dust and paint chips that children ingest through normal hand-to-mouth behaviour or during renovation. Only 45% of countries have legally binding controls on lead paint production. WHO targets the elimination of lead paint through the Global Alliance to Eliminate Lead Paint.

What is the battery recycling lead crisis?

Lead-acid batteries (used in vehicles, backup power) contain approximately 20 kg of lead each. Global battery demand is rising. Formal (enclosed) recycling is highly effective at capturing lead. Informal battery recycling — open-air smelting — releases massive amounts of lead dust and fumes into communities. In parts of Africa and Asia, informal battery recycling sites have contaminated entire communities, with children's blood lead levels exceeding 100 μg/dL. Pure Earth's Toxic Sites Investigation Program has documented hundreds of such sites.

What is the IQ loss from lead?

A landmark study estimated that 800 million children globally have elevated blood lead levels causing a cumulative loss of approximately 765 billion IQ points — equivalent to 6.4 IQ points per affected child on average. This unprecedented cognitive damage is largely invisible but has profound consequences for educational attainment, economic productivity and social development. The economic cost of lost productivity has been estimated at $977 billion per year.

How is lead poisoning treated?

For chronic, low-level lead poisoning — which affects the vast majority of children — the only treatment is removing the source of exposure. Cognitive damage from chronic exposure cannot be reversed. For acute, severe lead poisoning (BLL >45-70 μg/dL): chelation therapy with succimer (DMSA) or IV EDTA binds lead and promotes urinary excretion. Chelation slightly reduces BLL but does not reverse neurological damage already sustained. Ensuring adequate iron, calcium and zinc nutrition can reduce lead absorption from the gut.

What is lead in spices?

Lead adulteration of spices — particularly turmeric, cumin and chilli — is a significant and underrecognised lead exposure source in South Asia and the diaspora. Lead chromate (a bright yellow compound) is added to turmeric to enhance colour. Studies have found lead chromate in 30-50% of turmeric samples in Bangladesh and India. This has caused lead poisoning in both local consumers and South Asian diaspora communities in North America. Regulatory enforcement and supply chain testing are the solutions.

What is the Global Alliance to Eliminate Lead Paint?

The Global Alliance to Eliminate Lead Paint — co-led by WHO and UNEP — facilitates adoption of legally binding national controls on lead paint in all countries. It was established in 2009; as of 2023, approximately 45% of countries have such controls. The Alliance provides technical support for testing, regulation and phase-out, and targets elimination of lead paint production and sale in all countries.

How does GMJ News cover lead poisoning?

GMJ News tracks WHO lead exposure data, lead paint regulation progress, battery recycling hazards and the cognitive burden of lead on children. Lead in the environment — from historical fuel emissions, legacy paint and battery recycling — is a direct public health concern for Georgia and the South Caucasus, and a priority for PHIG's environmental health work.

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Lead Poisoning

GMJ News knowledge hub · last reviewed September 2026 · Georgian Medical Journal

Summary Statistics Glossary GMJ news FAQ Documents Organizations Research

Lead is one of the world's most pervasive environmental toxins: an estimated one in three children — over 800 million — have blood lead levels at or above 5 μg/dL, sufficient to cause cognitive impairment, behavioural problems and lifelong health consequences (WHO/UNICEF 2020). Lead exposure causes approximately 1 million deaths per year and is responsible for an estimated 21.7 million years of healthy life lost annually — yet it is entirely preventable by eliminating lead in petrol (achieved globally in 2021), paint, food containers and other sources. There is no safe level of blood lead.

Key messages

800 million children exposed

An estimated 800 million children — 1 in 3 globally — have blood lead levels at or above 5 μg/dL, sufficient to impair cognitive development. There is no safe level of blood lead (WHO/UNICEF 2020).

1 million deaths per year

Lead poisoning causes approximately 1 million deaths per year (GBD 2019) and is responsible for 21.7 million years of healthy life lost — disproportionately in LMICs through cardiovascular disease, kidney disease and brain damage.

765 billion IQ points lost

Lead exposure in children has been estimated to cause the loss of approximately 765 billion IQ points globally — a catastrophic, largely silent cognitive damage with lifelong consequences for educational attainment and productivity.

Leaded fuel phased out globally

In August 2021, Algeria became the last country to sell leaded petrol — completing the global phase-out of leaded fuel, one of the greatest public health achievements of the 21st century. However, legacy lead in soil and paint persists.

Lead paint remains a critical source

Lead paint on walls, furniture and toys is a major ongoing source — particularly in older housing in LMICs. Only 45% of countries have legally binding controls on lead paint. Children ingest lead dust during renovations or through normal hand-to-mouth behaviour.

No treatment — prevention is everything

There is no safe level of blood lead and no treatment reverses cognitive damage from chronic low-level exposure. Chelation therapy is used only for acute high-level poisoning. Prevention — eliminating lead sources — is the only strategy.

Key statistics

800M+

children with elevated blood lead

WHO/UNICEF 2020

deaths/year from lead exposure

GBD 2019

765B

IQ points lost globally from lead

IIASA/WHO

safe level of blood lead exists

WHO/CDC

2021

year leaded fuel phased out globally

UNEP

45%

of countries with legally binding lead paint controls

WHO 2023

Children with blood lead >=5 μg/dL by region (millions) — UNICEF/WHO 2020

Source: UNICEF/Pure Earth/WHO 2020. South Asia and Africa carry the highest burdens.

Glossary of key terms

Blood lead level (BLL)
CDC/WHOThe concentration of lead in whole blood — measured in micrograms per decilitre (μg/dL). There is no safe BLL. CDC reference value is 3.5 μg/dL (97.5th percentile in US children); WHO uses 5 μg/dL for action. BLLs above 45 μg/dL may require chelation therapy.

Leaded paint
WHOPaint containing lead-based compounds (lead carbonate, lead chromate) — once widely used for their durability and opacity. Now banned in most high-income countries but still produced in some LMICs. Lead paint deteriorates into dust that children ingest. Renovation of older housing releases lead dust.

Lead-acid batteries
WHO/UNEPThe largest remaining source of lead production and a major recycling-associated lead exposure source. Informal lead-acid battery recycling — smelting batteries in open fires — exposes workers and communities to high lead levels. Major source in Africa and Asia.

Chelation therapy
WHO/ClinicalMedical treatment for acute, severe lead poisoning (BLL typically >45 μg/dL) — using chelating agents (succimer/DMSA, EDTA) that bind lead and promote urinary excretion. Does not reverse existing cognitive damage. Not indicated for chronic low-level exposure.

Pica
WHO/PaediatricsA condition — common in young children and some pregnant women — characterised by craving and eating non-food substances (soil, paint chips, clay). Pica in lead-contaminated environments causes severe lead poisoning.

Primary prevention
CDC/WHOThe only effective strategy for lead poisoning — eliminating lead from the environment before exposure occurs. Includes: banning leaded paint and fuel; cleaning up contaminated sites; regulating lead in food, cookware and spices; and safe battery recycling.