Is there something different in the air in Northern Missouri than Southern?

I used to live in Northern Missouri (Kansas City area) and when I moved to Southern Missouri (Branson area) I noticed a difference in my health. I thought that I was just unhealthy before the move because after the move I went on a health kick. Like for example my lungs felt heavy and I somewhat sneezed (it wasn't excessive) and it seemed like I was always getting sick from a cough. I also realized I had a lot better balance than I had before(I used to trip and fall a lot I was klutzy).

When I visit I feel like my lungs are heavy and I sneeze a lot it also. I know that it's more than likely allergies, but I was wondering what kind of plants and stuff like that could I be reacting to that's up her but not down there.