Which of the following is not an occupational respiratory disorder? 

Occupational lung diseases are work-related lung conditions that have been caused or made worse by the materials a person is exposed to within the workplace (e.g., silicosis, asbestosis, anthracosis, siderosis, etc.). Emphysema is not an occupational respiratory disorder. Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major causes of emphysema is cigarette smoking.