Paper mills sure do stink terribly. Is it because they store the pulp for so long it rots/ferments? Or it's the chemicals? But they do smell like landfills. :/
Well, now that I think about it, the really bad smell does have a slight bit of a pine scent to it... So it's possible that it's from rotting. At the same time, the wood is generally shredded and left in large piles where it tends to dry out, so in that sense, you'd think rot wouldn't be a problem.
You'd also think, having grown up in a small town where said paper mill is one of the only major employers (outside of retail), I'd know a bit more about it. But nope.
I just know that before they passed all those laws regulating chemical emissions, the smell was much, much worse. To the point that my college history professor said he would be asked, "You mean, that town that's known for smelling awful all the time?" when he would go to seminars in other states. >_> (It also used to cause the paint to peel off cars if they were too close for a long enough period of time.)