A century of (don’t get creeped out) hair samples shows how sharply lead exposure fell after modern environmental rules took hold in the United States. A PNAS study found that current lead concentrations in hair from Utah’s Wasatch Front are almost 100 times lower than before the Environmental Protection Agency was established, documenting a long-run collapse after regulation of leaded petrol and other major sources. https://www.pnas.org/doi/10.1073/pnas.2525498123
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Ada Palmer
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2026-04-10 16:01:25 UTC
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