I agree with your assessment of unfairness. I personally see the solution as building way more housing. If you only make it illegal to build housing near pre-e

I agree with your assessment of unfairness. I personally see the solution as building way more housing. If you only make it illegal to build housing near pre-existing industry, then what? That's basically a let them eat cake argument (not saying that that's what you're suggesting), because now there aren't cheap options near industry, and unless zoning changes allow for much more housing in the non-industrial areas, then the supply of housing goes down, the price goes up, and poor people just have to deal (all in the name of being saved from industry).