The issue is this shouldn’t have happened in the first place. We as a society should have learned from, at least, the debacle that was leaded gasoline and its impact on populations over generations.
It's a fundamental fact: introducing anything new to an environment disrupts the status quo. In a living environment, that means health problems for living things. You either stop creating synthetic materials or you have unforeseen consequences. You can mandate more research and more rigorous standards, but that has diminishing returns. Some things will slip past.