I can tell you that, pollution is hard
Like the idea, just wondering what you're thinking for the pollution, I've discussed pollution implementations with a lot of people and it's hard to find a preformance effective way to do it
Two things that I'm thinking about:
1. Bad effects in a certain area around the pollution. That's easy to do. I already have that implemented in my environmental controller.
2. Possibly kill of living things in a certain area. I don't see that as too problematic either. You don't have to do this every tick and you also don't have to scan the entire polluted area every time.