G2 Gas Fitter Practice Exam

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Under OSHA regulations, what is the permissible exposure level for CO over 8 hours?

25 ppm
50 ppm
10 ppm
35 ppm

The correct answer is: 35 ppm

The permissible exposure level for carbon monoxide (CO) as defined by OSHA regulations over an 8-hour work shift is set at 35 parts per million (ppm). This value is established to protect workers from the harmful effects of carbon monoxide exposure, which can lead to serious health issues including dizziness, headaches, and, in extreme cases, can be fatal. The 35 ppm threshold considers both acute and chronic exposure to CO, ensuring that the risk is minimized over a standard workday. Choosing a different level would mean accepting a higher risk of adverse health effects for the workers, which is contrary to OSHA's commitment to maintaining safe working environments and protecting worker health. Establishing these levels is crucial for industries where CO exposure might occur, reinforcing the importance of monitoring air quality and implementing appropriate safety measures.