Where is Carbon Monoxide (CO) found in relation to the height of the mine entry?

Where is Carbon Monoxide (CO) found in relation to the height of the mine entry?

• A. Along the floor
• B. Along the mid height area of the entry
• C. Along the ceiling
• D. Throughout the entry

Answer: (B)

In a mine entry, gases mix with the ventilation air and the area where miners breathe—the mid-height zone—is where carbon monoxide is most likely to be encountered. Even though carbon monoxide is slightly lighter than air and tends to rise with air currents, the practical distribution in an active entry concentrates around the breathing zone, where detectors and monitoring are focused. This makes the mid-height area the most relevant location to find CO and to guard against exposure, rather than it staying specifically along the floor or the ceiling.

In a mine entry, gases mix with the ventilation air and the area where miners breathe—the mid-height zone—is where carbon monoxide is most likely to be encountered. Even though carbon monoxide is slightly lighter than air and tends to rise with air currents, the practical distribution in an active entry concentrates around the breathing zone, where detectors and monitoring are focused. This makes the mid-height area the most relevant location to find CO and to guard against exposure, rather than it staying specifically along the floor or the ceiling.