If you're one of the 25 million people in the United States with asthma, you may wonder where you can breathe easier. Where are the most challenging places to live with asthma? The 2018 Asthma Capitals Report has your answers, courtesy of the Asthma and Allergy Foundation of America (AAFA). Genetics, respiratory infections, tobacco smoke, and more all play a part, says AAFA. Can your location increase your risk? Can the city you live in create challenges that make asthma harder to control?