Lead exposure elimination

What the evidence says

The harm is well established. WHO says there is no known safe blood lead level. Citing the Global Burden of Disease study, it attributes more than 3.5 million deaths in 2023 to lead, mostly through heart and blood vessel disease. Other estimates run higher: Larsen and Sánchez-Triana (2023) put lead-linked cardiovascular deaths at about 5.5 million in 2019, six times the Global Burden of Disease figure for that year. They also estimated that children under five lost 765 million IQ points, and that over 90 percent of both harms fell on low- and middle-income countries.

Removing lead from products works at population scale. U.S. children aged 1 to 5 had 94.5 percent lower blood lead levels in 2011–2016 than in 1976–1980, a decline the researchers credit largely to federal rules on lead in gasoline, residential paint and plumbing solder. Leaded petrol ended worldwide when Algeria stopped selling it in July 2021, after a UN-hosted campaign that began in 2002.

Paint is next. As of January 2024, 48 percent of countries had legally binding controls on lead paint, according to WHO. Laws and practice can differ. Clark and colleagues (2014) found that paints in Brazil that had averaged 36,000 parts per million of lead tested below detection after a new legal limit, though without public monitoring they couldn’t confirm the law was the main cause. In India, where groups had campaigned against lead paint, 24 of 28 major-brand paints had dropped to 90 parts per million or less.

The grade is moderate because the links in the chain differ. Strong evidence shows that lead harms and that removing it lowers exposure. Charitology found no rigorous measurement of how much an advocacy campaign causes a law to pass or to be followed.

Where it sits on the depth scale

This is structure (depth 3). A ban changes the rules of a market so the harm stops being produced, for everyone and without ongoing delivery. Lead already in old paint and soil stays, so the benefit builds over generations.

Open questions

• How should a funder credit an advocacy group for a law many actors pushed? See the counterfactual problem and measuring the source.
• One advocacy group’s own preliminary model put its Malawi program at about $14 per DALY-equivalent averted (a DALY is a year of healthy life lost), a figure that more than triples if paint causes less of children’s exposure than assumed. Charitology has not found an independent estimate, so this entry has no Impact Calculator figure.
• Blood lead is rarely measured in many countries, so it is hard to see what changed.