Objectives Pneumoconiosis is the systemic disease of pulmonary fibrosis arising from long-term inhalation of dust. On the cause of the illness is clear, but there is no effective treatment yet. Coal worker pneumoconiosis (CWP) is one of the most serious occupational lung diseases currently, which is due to long-term inhalation of dust containing some dissociative silica. In the course of coal mining, workers exposed to either coal dust or silica dust because of the different types of work thus giving rise t...