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日本产业卫生协会1976年提出CO的阈限值为50ppm,美国政府工业卫生协会1973年提出的阈限值也是50ppm,苏联保健部1971年的最高容许浓高为20mg/M~3。
Japan Industrial Hygiene Association proposed in 1976 the threshold of CO 50ppm, the US Government Industrial Hygiene Association in 1973 proposed the threshold limit is 50ppm, the Soviet Union Ministry of Health in 1971 the maximum allowable concentration of 20mg / M ~ 3.