... but I am not sure if building pollution can vary by product. Unless I'm mistaken, there's a pollution modifier value for the recipe, so you could tell it to pollute 3x times as much for a flare-stack-heavy recipe, for example. Based on the chemical process involved, I think this would be not on...

I'm not crazy about the oil refinery changes. Can the refineries put out different levels of pollution based on what is being processed? I ask, because when crude oil comes out of the ground, it's a huge mix of different hydrocarbons stuff - all of which have different characteristics (viscosity, bo...