What percentage of Carbon Monoxide will produce discomfort in 2-3 hours?

The correct choice of 0.04% is significant because research indicates that prolonged exposure to carbon monoxide (CO) at this concentration can lead to symptoms of discomfort and health effects within a relatively short timeframe, like 2-3 hours. At this level, individuals may begin to experience headaches, dizziness, and fatigue, reflecting the toxic nature of carbon monoxide as it displaces oxygen in the bloodstream.

In terms of safety standards and awareness, this value highlights the importance of monitoring CO levels in environments where combustion occurs to prevent health issues. Understanding these levels is critical for foremen and workers in various industries to ensure a safe working environment. When exposure rises above this threshold, the likelihood of more severe health effects increases, reinforcing the need for adherence to safety protocols related to carbon monoxide detection and ventilation practices.