First: great mod, I really like the way it emphasizes how much some buildings pollute the world. The blanket across my biolabs was really interesting to see.
Some suggestions:
1) The smoke emitted from buildings without chimney is spread quite a bit over the bounding box edges. I would prefer it a bit closer to the building. It's a bit weird to see the ground emit pollution because it's adjacent to a biolab.
2) Despite my biolab producing a whopping 200 pollution per minute, the emitted clouds are pretty much all light gray - except every 3 seconds there's a single black cloud emitted, which has a weird spawning animation and vanishes after a few seconds. Not sure what exactly that is, but I would suggest to remove / fix that? The expected behavior (in my opinion) should be darker clouds everywhere.
