I pretty much agree with axlegear here. Nobody wants pollution that doesn't make sense or is just slapped there for "balance".
If its there, it must be something that you deal with because it actually does yield real problems not just some random machine inefficiency "cause pollution".
That is just something half thought and a lazy implementation that I can't accept, at all.
+1 for making the place an actual hazardous place to live, If you can't grow crops, livestock and such, or even breathe safely on that place, it makes pollution already a big problem, really.
Make environment hazardous, enough to destroy your industry.
ALL Blocks get corroded with rain (save acid-proof blocks that are expensive as fuck), machines that run on water or air malfunction, machines that burn stuff gets inefficient (lower oxygen quality), machines that run any cutting device will start to need regular "maintenance" (replace macerator grinder blades, sawmill saws and whatever more).