坑道进驻人员时空气中二氧化碳容许浓度

ALLOWANCE OF CO_2 CONCENTRATION IN AIR DURING RESIDENCE OF TROOPS IN TUNNEL

本文报告了坑道进驻人员时，空气中ＣＯ＿２容许浓度的标准。标准规定：（１）坑道通风条件下空气中ＣＯ＿２容许浓度为１％；（２）坑道密闭不通风条件下空气中ＣＯ＿２容许浓度为３％，最高容许浓度为５％。该标准适用于坑道进驻人员时的空气卫生监督；

he Standard of allowance of CO_2 concentration in air during residence of men in tunnelsis formulated as foilows:(1)1%under ventilated condition,(2)3%under closed and non-ventilated condition,the maximum at 5%.This standard is used for hygienic supervision ofair in tunnel during residence of men,and also referred to those residing in other under-ground conditions.