As a kid i grew up in Middleton - part of Greater Manchester, at the time we had,about 1/4 of a mile away, Pandora pickles which as the name would suggest made pickles and also Picallili - there was some funky smells around that place at times!
About 1/4 mile in the opposite direction we had JW Lees brewery which as others have suggested had some strong and to a kid at least unpleasant smell.
further on we had a Sarsons vinegar works, then further on still, we had Senior Service cigarette company - this to me as a kid was the worst of the lot, i absolutely hated the smell.
We also had a sewerage treatment works about a mile and a half away which on a warm day and the wind blowing in the right (or wrong!) direction would create some interesting smells too haha. Yeah i suppose it was quite a smelly area back then!!
One of the worst smells however, was in an area known as the Kingston stink - thankfully for me this was a good few miles away and i only had to pass through it every now and then, this was home to (i think) a tannery - i could never understand how anyone could live near this place