St. George, Utah and vicinity had one of the highest cancer rates in the country from the late 1950s to the early 1990s. It's directly downwind of the Nevada Test Site.
What is directly down wind of the NK test site, just more North Koreans, I don't think the test site will be on their border.
Don't get me wrong, I don't want the NK's to have a nuke, but a test is not a war or an attack.