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《煤矿安全规程》第464条规定,游离二氧化硅含量大于10%的粉尘,最高允许浓度为2mg/m~3,游离二氧化硅含量小于10%的粉尘,最高允许浓度为10mg/m~3。
“Coal Mine Safety Regulations” Article 464 provides that the free silica content greater than 10% of the dust, the maximum allowable concentration of 2mg / m ~ 3, free silica content of less than 10% of the dust, the maximum allowable concentration of 10mg / m ~ 3.