China Occupational exposure limits for hazardous agents in the workplace-Dust in Air
Chemical hazardous agents（GBZ 2.1‑2019）-Dust in Air establish clear exposure limits for various types of production dust. The standard specifies PC-TWA and excursion limits for both total dust and respirable dust, with particularly stringent concentration control requirements for highly fibrogenic dusts such as silica dust (containing ≥10% free crystalline silica) and coal dust. Employers are required to conduct periodic detection and assessment in accordance with this standard to prevent the occurrence of pneumoconiosis.
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