Earlier quoted context omitted.
The problem I've always found with the California warnings is that they're so damn generic. There's nothing forcing companies to tell you what compound is harmful, where it is, or what it's used for.. A fishing sinker made from lead is pretty obvious when you see that warning. There's only one ingredient, lead, and it's obvious why it's harmful. But when you buy a complex product that says "this product contains chem…
Even if they did, would it matter? It would be some chemical term, like the one you see in an ingedient list, that is meaningless to most people. And these are places, not products...with gardens. Even if they use organic pesticides, they probably still have to put up the warning.
Those places have products that contain the toxic chemical, An apartment building is not poisonous by itself, they contain products that contain the harmful chemical. That's what they should be warning you about.