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How do inhaled mineral dusts cause pneumoconiosis?

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Asbestosis — occupational disease The lung disease asbestosis is caused primarily by prolonged inhalation of asbestos fibers. It occurs mainly among workers whose occupations involve exposure to asbestos and people who live near mines, factories, and construction sites.

Pneumoconiosis is a group of lung diseases caused by the inhalation of inorganic or organic dusts over a prolonged period. When these particles reach the alveoli (air sacs) of the lungs, they trigger an inflammatory reaction that gradually converts healthy lung tissue into fibrous scar tissue. This process reduces the elasticity of the lungs and impairs overall respiratory function.1

The specific mechanism often involves the body's immune response. For example, in the case of silica dust, the particles are ingested by macrophages—scavenger cells intended to protect the lungs. Because the silica particles cannot be digested, they kill the macrophages. The accumulation of these dead cells and the subsequent inflammatory response leads to the formation of fibrous nodules and masses, which further restrict lung volume and gas exchange.2

The severity of the disease depends on the dust composition, the total dust load, and the duration of exposure. Protecting workers from these hazardous environments through proper ventilation and personal protective equipment is essential to preventing these irreversible conditions.12