If the damage done by Chernobyl was limited to the restricted area around the town, that wouldn't be so bad. But in fact, as I wrote in my other comment, large parts of western Europe have been contaminated too. Not to the level where one cannot live there any more, but to the level, where it makes it dangerous to eat wild mushrooms and game (which has to be checked for radioactivity before being considered edible). And this will be an issue for many decades to come.