Autopsy of the body of a 42-year-old man, who had chronic diffuse bronchitis and died of cardiopulmonary failure, shows large hyperinflated lungs that cover the mediastinum with their edges. The lungs do not deflate, are pale gray, emit crackling sound when cut. Pressing a finger to the surface of the lungs leaves an indentation. Bronchial lumen produces mucopurulent exudate. Make the diagnosis: