Leaded fuel has a long history of causing brain damage to kids exposed to the fumes, and it demonstrably does for kids living near airports as a result of propeller planes burning leaded fuel. The recent development of an unleaded fuel which can work in all the existing aircraft fleet has resulted in a small number of locations needing the sale of leaded fuel, and this will represent a full state-wide end to the use of leaded fuel.
I expect to see improvements in childrens’ intelligence and reductions in crime as over the coming decades as a result.
Yeah, the fact that several local governments banned leaded fuel sales was a big impetus for the FAA to actually approve the fuel for all piston-driven planes.