A 50-year-old man working in a coal mining factory for 16 years develops symptoms of progressively worsening breathlessness and cough with expectoration. A spirometry was performed and his values were: FEV1 – 1.4 L/min, FVC 2.8L/min . What could be the cause?

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026