A 35-year-old man has been working in a foundry for 14 years, where he is concentrated quartz dust is 4 times higher than the MPC. For 4 years he has been bothered by cough and shortness of breath during exercise. Weakened breathing was detected during auscultation. OGK radiography revealed: emphysema, small-spotted shadows on all pulmonary fields. What is the most likely diagnosis?