My grandparents moved to Colorado because my grandma had terrible asthma. On a trip to the high, dry climate, she went over two weeks without an episode. On their way back home, she had a really bad attack. My grandpa decided then and there the family would uproot and move to Colorado.
Various links are below to find out information about asthma and those impacted by it. My grandmother died when I was three. The picture in the header if me teaching my three year old to ski.