<unk>  may be classified according to subtypes based on the particle of exposure. These can be fibrogenic, granulomatous, benign or hard metal:  
Fibrogenic: silica, coal, asbestos, talc
Granulomatous: beryllium
Benign: Iron, tin, barium
Hard metal: cobalt
Pneumoconiosis classification
Tuberculosis classification
Empyema classification
Emphysema classification
Pneumoconiosis diagnostic criteria
Bronchiectasis classification
Hemoptysis classification
Silicosis classification