Each year, 1 in 5 children in the United States visit the ED at least once, often unnecessarily. A major driver of this preventable ED use is asthma. That's true across the country, but particularly in Illinois, which has one of the highest asthma morbidity and mortality rates in the United States. Mobile Care Chicago made it their mission to improve access to asthma services in Chicago neighborhoods that are short on asthma specialists.