What are the stages of black lung?

Related questions

1. What causes your lungs to turn black?
2. What can cause pneumoconiosis?
3. Is tuberculosis a type of pneumoconiosis?
4. How is pneumoconiosis diagnosed?
5. What are the different types of pneumoconiosis?
6. How do lungs get rid of dust?
7. What is complicated black lung?
8. Do your lungs clean themselves?
9. What are the three primary pneumoconiosis?

Tags

1. #complicated
2. #breathe
3. #miners
4. #mines
5. #underground
6. #caused
7. #wheeze
8. #ability
9. #silica
10. #encompasses
11. #stages
12. #surface
13. #black
14. #disease
15. #inhalation
16. #worst
17. #which
18. #gradually