Britannica Sources used in this answer

How can long-term coal dust exposure cause black lung disease?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

coal utilization Cross-regenerative coke oven. (A) Cross section, showing the alternating arrangement of flue walls and ovens; (B) longitudinal section, showing (left) a series of combustion flues in a single flue wall and (right) part of a long, slotlike oven.

Black lung disease, or coal workers' pneumoconiosis, is a respiratory condition caused by the repeated inhalation of coal dust over many years.1

The disease develops through a gradual process:
* Initial Deposition: Inhaled dust particles settle in the terminal bronchioles of the lung, where they trigger a fibrotic reaction.2
* Accumulation: Over time, the continued accumulation of dust creates a distinctive blue-black marbling within the lung tissue.1
* Progression: While early stages (anthracosis) may be asymptomatic, the condition can progress to a more generalized form. In advanced cases, large masses of fibrotic tissue form, a condition known as progressive massive fibrosis.12

This advanced stage is often associated with severe disability, chronic bronchitis, pulmonary emphysema, and an increased risk of heart failure or tuberculosis. Because there is no curative treatment for black lung, protecting workers from dust exposure is an essential ethical imperative in the coal industry.12