The South Pole could be called the healthiest place on earth because there's no pollution, no dust, and very few people. The air is as fresh and clean as it must have been everywhere before man began pouring industrial wastes into the atmosphere. Furthermore, it's one of few locations where man is not bombarded by germs. Not only is it too cold for them to be active, but there's nothing for them to live on. And since winds start at the South Pole and move northward, they tend to keep away any contaminants from that region.
Now you'd think people would be eager to live in such a germ-free environment but they're not. With temperatures that drop to 100 degrees below zero, it's just too cold.