Researchers at the Centers for Disease Control and Prevention found that the U.S. population is exposed to more mercury as people age, but the level of exposure begins to diminish when they reach 50. The study is part of a broader project that could aid in reforming the Toxic Substances Control Act. The results can be used to create "policy instruments that will reduce or prevent exposures and also have a way to track whether those instruments are working," one expert said.

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