There's an article about the Quebec study in The Globe And Mail that summarizes it. TLDR: postal code predicts gene expression better than DNA https://www.theglobeandmail.com/news/national/genetic-study-of-quebec-residents-finds-air-pollution-trumps-ancestry/article38217989/?utm_medium=Referrer:+Social+Network+/+Media&utm_campaign=Shared+Web+Article+Links