[epistasis]

Pollution laws protect against industrial operations polluting other areas, not zoning.

The real "pollution" they zoning was invented to solve was the "pollution" of residents of apartments living close to wealthier people. Seriously! Check out how the original Supreme Court decision phrased its motivation:

> “very often the apartment house is a mere parasite, constructed to take advantage of the open spaces and attractive surroundings created by the residential character of the district …. interfering by their height and bulk with the free circulation of air and monopolizing the rays of the sun which otherwise would fall upon the smaller homes.”

Here's a more extensive analysis from an org purporting to represent real estate, the source of much historical support for this sort of exclusionary zoning:

https://cre.org/real-estate-issues/americas-sordid-history-o...