Every year the Asthma and Allergy Foundation of America ranks the worst cities for allergies. In spring 2015, Dallas was the 19th worst. In spring 2016, it fell to 27th — better, but still one of the worst in the nation. Texas is deep in the Pollen Belt — the region of the country that stretches from the southern Midwest to the Southeast. It’s the worst area for allergies in the nation. If your child has seasonal allergies, they have some specific challenges living in the Dallas area. Unlike some other parts of the country, there’s a seasonal allergy for all four seasons:.