ABSTRACT
NIOSH CRITERIA DOCUMENT AUG72 NIOSH RECOMMENDS THAT OCCUPATIONAL EXPOSURE TO CARBON MONOXIDE BE CONTROLLED SO THAT NO WORKER BE EXPOSED TO A CONCENTRATION OF NO MORE THAT 35 PPM DETERMINED AS A TIME-WEIGHTED AVERAGE (TWA) EXPOSURE FORAN 8-HOUR WORK DAY. NO LEVEL OF CO TO WHICH WORKERS ARE EXPOSED SHALL EXCEED A CEILING CONCENTRATION OF 200 PPM BASED ON CARDIAC EFFECTS. THE PRESENT OSHA STANDARD IS 50 PPM (TWA).
