China Occupational exposure limits for hazardous agents in the workplace — Part 1: Chemical hazardous agents (GBZ 2.1‑2019)-Biological Monitoring Indicator and Biological Limit Value
China Occupational exposure limits for hazardous agents in the workplace — Part 1: Chemical hazardous agents (GBZ 2.1‑2019)-Biological Agents in Air
China Occupational exposure limits for hazardous agents in the workplace — Part 1: Chemical hazardous agents (GBZ 2.1‑2019)-Dust in Air
China Occupational Exposure Limits for Hazardous Agents in the Workplace - Part 1: Chemical Hazardous Agents (GBZ 2.1‑2019) - Chemical Hazardous Agents in Air
