America drove its children's blood lead down 96% by taking lead out of petrol and paint. Worldwide, one child in three still carries more than the level that calls for action — and the bill runs into trillions.
800M
Children worldwide — about 1 in 3 — with blood lead at or above 5 µg/dL, the level that calls for action. Nearly half of them live in South Asia.
UNICEF & Pure Earth, The Toxic Truth, 2020 (IHME analysis)
01 · The scale
From today's typical child to 1971's "poisoning"
Blood lead in micrograms per decilitre, on a log scale. Every level below once counted as normal or safe. WHO now says no level is known to be safe.
0.6US child median 2017–20
2.4US child 95th percentile
3.5CDC reference value, 2021
5UNICEF action level (800M kids)
10CDC "level of concern", 1991
15US child median 1976–80
25CDC threshold 1985
40"Undue absorption" 1971
80"Lead poisoning" 1971
← 0.5 µg/dLlog scale · µg/dL100 µg/dL →
02 · The falling line
US children's blood lead fell 96%
Median blood lead, children aged 1–5, by national survey period. Most of the drop came as lead left petrol.
Points are survey-period medians (NHANES 1976–80, 1988–91, 1999–2000, 2017–Mar 2020), plotted at period midpoints; lines between them are interpolations. Source: US EPA, America's Children and the Environment.
−96%
Median blood lead in US children aged 1–5, 1976–80 to 2017–20 (EPA).
−78%
Mean blood lead for all Americans aged 1–74 in just over a decade, 12.8 → 2.8 µg/dL (1976–80 to 1988–91). Researchers credited taking lead out of petrol and out of soldered food cans (Pirkle et al., JAMA 1994).
03 · The moving goalpost
"Safe" kept getting smaller
The US level that triggers public-health concern for a child has been cut by more than 90% in half a century, as the science on low doses improved.
1971: Surgeon General's "undue absorption" level; 1975–1991: CDC levels of concern; 2012 onward: CDC blood lead reference value, set at the 97.5th percentile of US children. The 2012 value was published as 5 µg/dL. Sources: CDC Childhood Lead Poisoning Prevention timeline; Paulson & Brown, Environmental Health 2019.
04 · Counting the toll
How many deaths? Every new count is higher.
Estimates of adult deaths caused by lead each year, mostly from heart disease and stroke, have risen as studies capture harm at lower doses.
IHME Global Burden of Disease2021 data
1.5M
WHO fact sheet (GBD update)2023 data
3.5M
Larsen & Sánchez-Triana, Lancet Planetary Health2019 data · heart disease only
5.5M
These models use different methods and years, so read them as a range, not a time series. The 2023 Lancet estimate is about six times earlier GBD figures and puts lead on par with outdoor and household air pollution combined. About 90% of those deaths occur in low- and middle-income countries.
05 · The bill
What lead costs the world
One modelling study priced lost IQ and heart-disease deaths for a single year, 2019.
$6.0T
Global cost of lead exposure in 2019 — 6.9% of world GDP (range $2.6–9.0T).
Larsen & Sánchez-Triana, 2023 · modelled
765M
IQ points lost among children under five worldwide, 95% of them in low- and middle-income countries.
Larsen & Sánchez-Triana, 2023 · modelled
48%
Share of countries with legally binding limits on lead in paint, as of January 2024. The rest have none.
WHO, 2024
Leaded petrol was sold for about a century and ended only in July 2021, when Algeria used up its last stocks. UNEP says the phase-out will prevent more than 1.2 million premature deaths a year (projection).
06 · What you can do
Lead is preventable. Most of what remains comes from a few sources.
Test young children, especially in homes built before 1978 (US) or near battery recycling or smelting. A blood test is the only way to know.
Treat old paint as hazardous. Wet-wipe dust, never dry-sand or scrape, and use certified renovators.
Check your water line. Ask your utility whether your service line is lead. Run the cold tap before drinking, and never use hot tap water for baby formula.
Back paint laws and battery recycling rules. More than half of countries still have no binding limit on lead paint, and informal battery recycling is a leading source for children in poorer countries.