There are so many things we take for granted living in South Dakota. One of the most overlooked is our ability to breathe easy with some of the purest air in America. An odd thing that's puzzled folks vacationing in Mexico is that there seems to be an abundance of South Dakota license plates. Gallery Credit: Andy GottWhere Are You Most Likely to Encounter a Tornado in South Dakota? The folks at Stacker crunched the numbers to find the top 10 South Dakota counties likely to see tornados.