Well, none really. You can develop allergies to the things growing in the new place. Happens to a lot of people! But if you are allergic to a very few things and they only grow in certain parts of the country, then move to a place they don't grow. For example, if you are allergic to dogwood trees, move to south TX, Florida, etc where they don't grow well. But you porbably have a corabination of allergies and would probably be exposed to some of them most anywhere.
