I find industrial/factory smells refreshing sometimes.
I do too. Sometimes I like to cycle through industrial areas.
However, just because a business has been emitting some sort of foul smoke for decades doesn't mean they can keep doing it forever. Times change and people don't necessarily have to accept what was allowed in the past. It's definitely ok to question what's going on at these locations.
Until I hear otherwise I will assume that the businesses at 28th are legitmate, and operating as cleanly as they reasonably can, and aren't emitting anything dangerious.