Back in the 70's, had horrible allergies growing up in the midwest. A few months after I got married, my lovely bride and I took our 3/4 race converted Dodge Dart up the (then unpaved) Alaska Highway, which was quite the adventure. Never had sinus problems up there the eight years we were there. Back in the Lower 48, they've come back.
I mention moving back to Alaska again, from time to time. Mostly just to see the dear-in-the-headlights look she gets!