When you fly into Savannah, GA (where my dad's from), if you're coming from the north anyway (usually via a stopover in Atlanta), you get about fifteen minutes where you're right in the area of this huge paper mill outside of town, and the scent from its waste materials gets sucked right into the plane. It's worse than any kind of manure you can imagine. I have no idea why it smells so bad. Paper is made from trees, right?