The Death of Grass is a real zinger lots of unexpected stuff done matter of factly.
albeit if you're looking for probably the 2 best apocalyptic dystopias
"War Day" Whitley Streiber or "Alas Babylon" Pat Frank.
nb I found the The Pool of Fire kinda disapointing after the City of Lead and Gold. That one was seriously messed up.
Another very interesting read is "Unwind" a young adults book that mixes enforced organ donation, abortion politics and adventure in a quite unholy mix.