Minimum duration of developing coal miners pneumoconiosis is -
- The coal miners pneumoconiosis has two phases; first phase is simple pneumoconiosis which is associated with little ventilatory impairment. - this phase may require about 12 years of work exposure for its development. - second phase is characterized by progressive massive fibrosis Reference: Park's textbook of preventive and social medicine, 23rd edition, pg no:806 <\p>
2-4 years
4-6 years
8-10 years
More than 10 years
Hospital waste and disaster management, Occupational health