How to classify pneumoconiosis

Pneumoconiosis is a generalized concept, belonging to a kind of occupational disease, is caused by inhalation of silicon-containing dust through the respiratory tract. Pneumoconiosis in China is divided into 12 categories, most common silicosis, coal lung, welder's lung, asbestosis, according to the different types of inhaled dust and distinguish. Pneumoconiosis hazards to the bronchial small airway and alveolar damage. The rapid degree of illness and the duration of exposure to the polluted environment, inhalation concentration related. The particles with diameter of 2.5μm are most likely to deposit in small airway and alveoli. When the particles are smaller, they are easy to be exhaled. When the particles are larger, they are easy to deposit in throat.