The problem is that zero keeps shifting. These idiots never heard of hormesis. Yet, they delight in lowering limits only to look good or keep their bureaucrats busy.
HUD did the same thing with lead levels in children. The numbers had dropped so quickly that they arbitrarily lowered the acceptable amount by half. Suddenly, there was an uptick in children with lead “poisoning”.
Neither had I. Looked it up and learned something, thank you. And it sure is applicable to the matter at hand.