Pneumoconiosis is a type of occupational respiratory problem caused by inhalation of inorganic dusts. Due to the constant exposure to these dusts, the lung loses its elasticity, undergoes fibrosis and loses its ability to expand to its full extent. This restriction reduces the total capacity of the lungs. Types of Pneumoconiosis Based on the type of inorganic dust that is inhaled, there are different types of pneumoconiosis that you might encounter: