What are the signs of a potentially explosive atmosphere in a mine?

The presence of unusual odors and gas build-up in a mine is a clear indicator of a potentially explosive atmosphere. In mining operations, certain gases, such as methane, can accumulate and create hazardous conditions if not properly managed. When miners detect unusual smells or notice that gas is accumulating, it is a strong signal that there may be an increased risk for an explosion due to the presence of flammable gases.

In contrast, regular air quality readings are meant to monitor the environment continuously and do not alone indicate an immediate risk of an explosive atmosphere. Temperature increase can occur for various reasons and does not specifically signify the presence of combustible gases. Rapid worker fatigue could be a sign of various issues, such as inadequate oxygen levels or general physical exhaustion, but it is not a direct indicator of an explosive atmosphere. Thus, recognizing unusual odors and gas accumulation is critical for ensuring safety in mining operations and for preventing potential explosions.