The Asthma and Allergy Foundation of America ranks which cities are the worst. The rankings are based on pollen count (which includes grass/tree/weed pollen as well as mold spores), how much allergy medication is used in each city, and the number of allergists per capita. The full list of 100 and more details on methodology are available on their site (pdf). Here are the 10 worst cities in the U.S. for people with allergies in 2014:
1. Louisville, KY
2. Memphis, TN
3. Baton Rouge, LA
4. Oklahoma City, OK
5. Jackson, MS
6. Chattanooga, TN
7. Dallas, TX
8. Richmond, VA
9. Birmingham, AL
10. McAllen, TX