The Asthma and Allergy Foundation of America (AAFA) has named Knoxville, Tenn the Asthma Capital of the United States for the third time in 5 years.

The AAFA’s top 100 most challenging places to live with asthma are chosen based on prevalence factors, risk factors, and medical factors for asthma sufferers.

Knoxville is followed by Tulsa, Okla; Milwaukee, Atlanta; and Memphis, Tenn in the ranking. For a complete listing of the 100 cities, visit