This standard stipulates the maximum allowable concentration of 50% to 80% free silica dust in the workshop air. This standard applies to new construction, reconstruction and expansion of industrial enterprises. For existing industrial enterprises that have pollution hazards, effective measures should also be actively taken to gradually meet the relevant provisions of this standard.
GB 11724-1989 history
1989GB 11724-1989 Health standard for dust containing 50%~80% free silica in the air of workplace
GB 11724-1989 Health standard for dust containing 50%~80% free silica in the air of workplace has been changed from TJ 36-1979 Hygienic Standards for Design of Industrial Enterprises.