A 60-year-old man is admitted for elective hernia repair. He has a 40- pack-per-year smoking history and worked as a construction worker for 20 years. He complains of shoness of breath and occasional blood-streaked sputum. His ECG shows lateral wall ischemia. The findings on his chest x-rays are due to
Chronic bronchitis Empyema Environmental occupational exposure Congestive hea failure