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All inhaled dust should be considered harmful to some degree. Even if there is only a slight danger to the lungs, it is very likely that there will be some adverse effects on the respiratory system, especially for asthma sufferers or allergy sufferers. Dust particles ranging in size from 0.001 to 0.1 mm (1 to 100 microns) in air pose a health hazard, reduce vision, create an uncomfortable environment (eyes, ears, nose, throat, skin irritation) and possibly damage lung tissues.
Potentially harmful dusts include silica, asbestos, sugarcane fiber, carborundum, diatomite, talc, and cotton dust, each of which can cause its own lung injury when dust control is inadequate. The most common harmful dust in mines is dust containing silica, and it is seen that the harmfulness increases with the increase of the silica percentage in the dust. In addition, the most harmful dust size is particles smaller than 5 microns, that is, smaller than 0.005 mm. Since this dust is not visible to the naked eye, it cannot be concluded that there is no danger because the dust is not visible.
Monitoring a worker's health is required by law when workplace dust measurements have the potential to exceed exposure limits or when the level of risk from the hazard varies. Measurements should be carried out in accordance with the scope of "Regulation on Health and Safety Precautions in Working with Chemicals".
