Find trusted information on lung diseases from the American Lung Association. Learn symptoms, causes, diagnosis, treatments and management for common and rare lung conditions.

What Is the Air Quality Index? Ever hear your local weather forecast say that tomorrow will be a "code orange" day for air pollution? That's the Air Quality Index at work. The Air Quality Index, or ...

Review our methodology for a full explanation of data sources and calculations utilized to assign grades for the air you breathe. The colors used in “State of the Air" are based on the Air Quality ...

Sue had just retired and was training for a half marathon when she developed a dry cough that she couldn’t shake. At first, ...