Carbon monoxide

CAS RN: 630-08-0

Threshold Limit Values

8 hr Time Weighted Avg (TWA): 25 ppm.
Excursion Limit Recommendation: Excursions in worker exposure levels may exceed 3 times the TLV-TWA for no more than a total of 30 minutes during a work day, and under no circumstances should they exceed 5 times the TLV-TWA, provided that the TLV-TWA is not exceeded.
Biological Exposure Index (BEI): Determinant: carboxyhemoglobin in blood; Sampling Time: end of shift; BEI: 3.5% of hemoglobin. Determinant: carbon monoxide in end-exhaled air; Sampling Time: end of shift; BEI: 20 ppm. The determinant may be present in biological specimens collected from subjects who have not been occupationally exposed, at a concentration which could affect interpretation of the result. Such background concentrations are incorporated in the BEI value. The determinant is nonspecific, since it is also observed after exposure to other chemicals.
Find more information on this substance at: PubChem, PubMed