Overview of environmental lung diseases

[Justin Bieber]

Environmental lung diseases are caused by harmful particles, mists, vapors, or gases that are inhaled, usually while people work. If the lung disease is due to inhaled particles, the term pneumoconiosis is often used.
Where within the airways or lungs an inhaled substance ends up and what type of lung disease develops depend on the size and kind of particles inhaled. Large particles may get trapped in the nose or large airways, but very small ones may reach the lungs. There, some particles dissolve and may be absorbed into the bloodstream. Most solid particles that do not dissolve are removed by the body’s defenses.
The body has several means of getting rid of inhaled particles (see also Defense Mechanisms of the Respiratory System). In the airways, an accumulation of secretions (mucus) coats particles so that they can be coughed up more easily. Additionally, cells lining the airways have tiny filaments called cilia that stick out into the airways, and these filaments can brush inhaled particles upward, out of the lungs. In the small air sacs of the lungs (alveoli), special scavenger cells (macrophages) engulf most particles and render them harmless.
Many different kinds of particles can harm the lungs. Some are organic, meaning that they are made of materials that contain carbon and are part of living organisms (such as grain dusts, cotton dust, or animal dander). Some are inorganic, meaning that they usually come from nonliving sources, such as metals or minerals (for example, asbestos or silica).