What hazards are associated with coal dust, and how can exposure be minimized?

• A. Coal dust is harmless; exposure is not a concern.
• B. Coal dust causes coughing only; no control needed.
• C. Coal dust causes respiratory disease and explosion risk; minimize with moisturizers.
• D. Coal dust causes respiratory disease and explosion risk; minimize with water sprays, dust suppression, ventilation, and housekeeping.

Answer: (D)

Coal dust in underground mining creates two main hazards: it can cause serious lung diseases from inhalation, and it can fuel explosions if the dust becomes suspended in air and an ignition source is present. Inhalation of fine coal particles irritates and can scar lung tissue over time, leading to conditions like coal workers’ pneumoconiosis and other respiratory problems. The explosion risk comes from combustible dust mixing with air; with enough concentration and an ignition source, it can ignite or explode, causing severe injuries.

To minimize exposure, use water sprays or other dust suppression methods at the source and during handling and transport to keep dust from becoming airborne. Good ventilation helps dilute and remove dusty air, reducing inhalation exposure. Regular housekeeping is essential to prevent dust from accumulating on surfaces, equipment, and in pathways where it can become airborne again. Together, these controls address both lung-health risks and the potential for explosive dust clouds.

Moisturizers do not reduce dust exposure and aren’t a protective measure, so they don’t help manage these hazards.