A century of hair samples proves leaded gas ban worked
The Environmental Protection Agency (EPA) cracked down on lead-based products—including lead paint and leaded gasoline—in the 1970s because of its toxic effects on human health. Scientists at the University of Utah have analyzed human hair samples spanning nearly 100 years and found a 100-fold decrease in lead concentrations, concluding that this regulatory action was highly effective in achieving its stated objectives. They described their findings in a new paper published in the Proceedings of the National Academy of Sciences.
We've known about the dangers of lead exposure for a very long time—arguably since the second century BCE—so why conduct this research now? Per the authors, it's because there are growing concerns over the Trump administration's move last year to deregulate many key elements of the EPA's mission. Lead specifically has not yet been deregulated, but there are hints that there could be a loosening of enforcement of the 2024 Lead and Cooper rule requiring water systems to replace old lead pipes.
“We should not forget the lessons of history. And the lesson is those regulations have been very important,” said co-author Thure Cerling. “Sometimes they seem onerous and mean that industry can't do exactly what they'd like to do when they want to do it or as quickly as they want to do it. But it's had really, really positive effects.”