A recent study in The Journal of Urban Health found that approximately 20% of New York City teenagers had asthma symptoms but had not received an asthma diagnosis.

It is unclear whether the study reflects a larger issue of undiagnosed asthma in the United States, according to experts. What is known is that there are about 25 million people living with asthma in the U.S., including 6 million children. This translates to approximately one in 12 people, and one in 10 children, according to the CDC.

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