I will say in Indiana this has changed a lot. Family sized hog farms are pretty much gone replaced by ginormous production operations.
The average # hogs on one location has gone from 900 to 9000 since the early 90s.
That’s a LOT of manure in one place.
I’ll take the smell of hog manure over chicken chit anyday.
I’m north of Indy in farm country and can seldom smell the relatively small hog facility a mile or so south of me.
With the cost of a modern hog barn, it’s amazing pork is as cheap as it is.