Scientists at the University of Utah analyzed nearly a century of human hair samples and discovered a dramatic decline in lead concentrations, dropping from around 100 parts per million (ppm) in 1969 to below 1 ppm by 2024, coinciding with the EPA’s regulations on leaded gasoline. The study, published in the Proceedings of the National Academy of Sciences, highlights the significant impact of the EPA’s efforts since its establishment in 1970. Concerns arise as the Trump administration seeks to reduce EPA oversight, particularly regarding the 2024 Lead and Copper rule for replacing old lead pipes.
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