The "Standard for the Provision of Labor Protective Equipment (Trial)" issued by the State Economic and Trade Commission in 2000 explicitly requires that "gauze masks should not be used as dust masks."
　　
Why is this? Because the general cotton gauze mask can only block part of the dust, the principle of its resistance to dust is mechanical filtration, that is, when the dust collides with the gauze, through the layer of barrier, some large particles of dust are blocked in the sand. However, for some fine dusts, especially those less than 5 microns in size, they will pass through the mesh of the gauze and enter the respiratory system. The dust below 5 microns can directly enter the alveoli, which will have the greatest impact on human health. Layers will not enhance the protective effect. Therefore, cotton gauze masks cannot play a role in dust prevention.
　　
Source: Occupational Health Network
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