National Jewish Health ranked the top pulmonolgy hospital in the nation.

DENVER, CO - AUGUST: Kathy Kramer, a respiratory therapist, left, asks her patient John Castona, right, to take big deep breathes during a routine pulmonary function test at National Jewish Health on August 7, 2017 in Denver, Colorado. U.S. News and World Report put out its annual ranking of hospitals and National Jewish was the top pulmonology hospital in the nation. This makes 21 consecutive years the Denver hospital has ranked No. 1 or No. 2 and the 16th time it was No. 1. The rankings are based on a combination of factors, including recognition by pulmonologists across the nation, patient volume, safety, survival, advanced technology and patient services. Castona is struggling with COPD that might have been caused by his work as a firefighter at the Hanford Site Nuclear facility in Washington. (Photo by Helen H. Richardson/The Denver Post via Getty Images)