Nearly four in every 10 Bangladeshi children aged one to five have elevated levels of lead in their blood, exposing millions to an invisible neurotoxin capable of permanently damaging brain development, intelligence and learning ability.
The danger becomes dramatically greater around industrial pollution hotspots.
More than two-thirds of children living near industrial facilities or e-waste processing sites have elevated blood lead levels, while the rate climbs to a staggering 80.6% around lead-acid battery recycling areas, according to the final findings of the Bangladesh Multiple Indicator Cluster Survey (MICS) 2025.
The nationally representative survey, conducted jointly by the Bangladesh Bureau of Statistics (BBS) and Unicef, tested 10,661 children aged 12–59 months and found 38.4% with blood lead concentrations of at least 5 micrograms per decilitre (µg/dL).
The findings expose a public health threat extending far beyond conventional poisoning: lead can interfere with the development of a child’s brain and nervous system, impairing attention, memory, behaviour and cognitive ability, with some damage potentially irreversible.
The consequences may also extend to Bangladesh’s economy.
Estimates cited in the report put the annual economic cost associated with cognitive losses from childhood lead exposure at around Tk70,900 crore, equivalent to approximately 3.5% of the country’s GDP in 2019.
The findings also point to exposure before birth, with elevated levels detected among pregnant women, while a high prevalence of anaemia among exposed children raises additional health concerns.
Exposure widespread
The average blood lead concentration among all children tested was 5.21 µg/dL.
Of those tested, 7.1% had concentrations of 10 µg/dL or higher, while 31.2% recorded levels between 5 and 9.99 µg/dL. Another 27.5% had concentrations between 3.5 and below 5 µg/dL.
Boys were more affected, with elevated levels detected among 40.3%, compared with 36.2% of girls.
Lead is a potent neurotoxin, and health authorities warn that there is no known safe level of lead exposure for children.
The developing brain is particularly vulnerable because exposure during early childhood can affect neurological development at a critical stage.
Dr Shaoli Sarker, associate professor of Neurology at Bangladesh Shishu Hospital & Institute, said doctors were seeing more children presenting with neurodevelopmental problems than in previous years, although she cautioned against attributing that increase specifically to lead without further research.
“Without specific research, it is not possible to say at this stage that lead exposure is solely responsible for this increase,” she told Dhaka Tribune.
Lead, however, is capable of disrupting normal neurodevelopment.
“Lead exposure can interfere with normal neurodevelopment by affecting the frontal and prefrontal regions of the brain and disrupting neural connectivity,” Sarker said.
“This may impair functions such as attention, impulse control and executive functioning, which are essential for healthy cognitive and behavioural development.”
Such disruption has also been associated with neurodevelopmental conditions including attention-deficit/hyperactivity disorder, or ADHD, she said.
Sarker cautioned that the effects may not be confined to immediate neurological problems.
“Prolonged exposure can potentially affect brain development and cognitive development in children,” she said.
Lead exposure may also produce epigenetic effects, potentially altering gene expression through interactions between environmental and genetic factors, she added.
However, Sarker stressed that more epidemiological and clinical research would be necessary to establish the extent to which lead exposure is contributing to neurodevelopmental problems among Bangladeshi children.
Public health and vaccination expert Tajul Islam A Bari said the consequences could extend beyond neurological development.
“Children with high levels of lead in their bodies may have weakened immune systems, which can also reduce the effectiveness of vaccines. They may also face a higher risk of developing various other diseases,” he told Dhaka Tribune.
Eight in 10 exposed near battery recycling
The national average masks striking geographical and environmental disparities.
Among children living within five kilometres of industrial facilities or e-waste processing sites, 68.3% had elevated blood lead levels.
Around lead-acid battery recycling areas, the prevalence reached 80.6% -- more than twice the national rate.
Nearly one-third of children in these areas recorded concentrations of at least 10 µg/dL.
The findings put informal battery recycling and unsafe e-waste processing at the centre of concerns over children’s exposure.
Other potential sources identified in the report include lead-contaminated spices, lead-based paints, low-quality cookware, toys and cosmetics, as well as contaminated soil and household dust.
Urban children were considerably more exposed than their rural counterparts.
Nearly half, or 49.6%, of children in urban areas had elevated blood lead concentrations, compared with 33.7% in rural areas.
Sylhet recorded the highest prevalence among divisions at 46.8%, followed by Dhaka at 42.5% and Chittagong at 42.1%. Rajshahi recorded the lowest at 15.9%.
Wealth offers no protection
One of the survey’s more striking findings challenges the assumption that lead exposure is predominantly a problem of poverty.
More than half, 51.5%, of children from the wealthiest households had elevated blood lead levels, compared with 30.2% among children from the poorest households.
Possible sources associated with urban living include contaminated dust, paint, processed foods and certain ceramic utensils, alongside broader environmental pollution.
The findings suggest that higher household income alone provides little protection against a contaminant that can enter children’s bodies through food, household products and their surrounding environment.
Lead and anaemia
MICS 2025 also identified a troubling overlap between lead exposure and anaemia.
Overall, 43.9% of children aged 12–59 months were anaemic, with an average haemoglobin concentration of 10.99 g/dL.
Among children with blood lead concentrations above 5 µg/dL, 43.5% were anaemic.
This included 28.4% with mild anaemia, 14.5% with moderate anaemia and 0.5% with severe anaemia.
Children aged 12–23 months appeared particularly vulnerable.
Among children in this age group with elevated lead levels, 54.2% were anaemic, while 41.7% of all children in the age group had blood lead concentrations above the threshold.
Exposure begins before birth
The threat is not limited to children who are already born.
The survey tested 1,940 pregnant women aged 15–49 and found 7.5% with blood lead concentrations above the threshold.
Geography again produced sharp differences.
The rate rose to 22.8% among pregnant women in Dhaka Division and 44.8% among those living near industrial areas.
Maternal exposure is particularly concerning because lead can affect a developing foetus, making prevention important even before a child is born.
The scale of the findings means tackling the problem will require interventions extending from factories and informal recycling operations to food safety and consumer products.
Public health experts have called for stronger enforcement against unsafe and illegal battery recycling, tighter monitoring of food contamination and adulteration, greater availability of lead-free products, and expanded screening and treatment for exposed children.
The MICS findings ultimately reveal a threat that is largely invisible in everyday life but potentially permanent in its consequences.
For Bangladesh, where almost four in 10 young children are already carrying elevated concentrations of lead in their blood, the cost may be measured not only in illness, but in lost learning, diminished cognitive potential and the future capabilities of an entire generation.