Here’s what you’ll learn when you read this story:After analyzing hair samples, researchers found that lead exposure saw a drastic downturn from the early 1900s through the 2020s. While there is still lead paint and infrastructure (such as pipes that need replacement), human hair has shown that exposure is now a fraction of what it once was. Cerling found that before regulations were implemented, levels of lead in hair were about a hundred times higher than they were post-regulation. Related Story How to Test for Lead Paint in Your HomeMore work still needs to be done. Despite nervousness surrounding the current administration possibly relaxing regulations, Cerling still thinks the hair samples show evidence of vast improvement that will continue in the future.