When Toba blew 75,000 years ago, only 2-5,000 people worldwide survived. The death from the 'nuclear winter' effect from Toba can still be seen in the human genes. BTW, even the Mormons with their one year 'stash' of food will not survive.
Yeah, the Yellowstone ash grinds the lungs. I think that's how a lot of the animals in Texas died the last time Yellowstone blew, from lung desease.