Asthma is a chronic respiratory condition that affects millions of Americans, and environmental factors can significantly impact asthma symptoms. Poor air quality, high pollen counts and climate conditions contribute to making certain cities more challenging for asthma sufferers. Below are the ten worst cities for asthma in the USA in 2025, based on air pollution, allergen levels, healthcare access and climate conditions. Allentown, located in eastern Pennsylvania, has been repeatedly ranked as one of the worst cities for asthma sufferers. Several factors contribute to its high asthma rates, including...