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This amendment updates certain contents of "Occupational Exposure Limits for Hazardous Agents in the Workplace— Part 1: Chemical Hazardous Agents" (GBZ2.1-2019). Specifically, it revises the content of item 12 in Table 1 of Section 4.1, adds item 29 to Table 4 in Section 4.4, and adds item 25 to Table B.1 in Appendix B. It is applicable to the health design of industrial enterprises, as well as the management, control, and occupational health supervision and inspection of chemical hazards in the workplace.