Acid rain is real. So is quicksand. Either of them being common and severe hazards experienced across the entire US (and maybe elsewhere, I don’t know what the rest of you were taught in gradeschool), not really.

Real acid rain causes mass ecological damage through relatively subtle increases in acidity over several exposures. The way we learned about it in school, whether they meant to or not, came across like concentrated hydrochloric acid was going to rain from the skies and melt human flesh on contact.

Don’t forget how to put yourself out if you spontaneously combust, and acid rain.