Lead does not readily degrade, either. It is still in the soil, the dust, our building, our foods, et cetera. People seem to be generally less exposed in each successive generation, however.
It'll be interesting to see as the baby boomers pass away [0] if the political pendulum swings from "rah rah fu got mine, cruelty is the point, suck it libt*rds" conservatism, back to liberalism. It'd give me hope that Tr_mp winning again was just "one last hurrah" of those right-of-center (or by international standards, far-right) in the US.
https://en.wikipedia.org/wiki/Tetraethyllead