Not sure if this is worth much, but I saw this earlier today and thought I'd leave it here. It's just an observation from a reddit user: "Cinematographer Jakob Ihre deliberately over-exposed all outdoor scenes to mimic the way the radiation during the Chernobyl disaster bleached out and destroyed the film taken at the time." [0]

[0]: https://www.reddit.com/r/TVDetails/comments/bz28hw/cinematog...