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flag U.S. lead exposure dropped over 100-fold since the 1960s due to regulations, but no level is safe, experts say.

flag A new study of hair samples from 1916 to 2024 shows lead exposure in the U.S. dropped over 100-fold since the 1960s, peaking during the mid-20th century due to leaded gasoline, industrial emissions, and household products. flag The research, based on 47 samples from Salt Lake City, links the decline to environmental regulations like the Clean Air Act and the creation of the EPA. flag Despite progress, experts warn no lead level is safe, and risks like cognitive harm and heart disease persist, urging continued vigilance in older homes and infrastructure.

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