What is one possible type of atmospheric hazard found in manholes?

Oxygen deficiency is a significant atmospheric hazard often found in manholes and confined spaces. This situation arises because these environments can limit the flow of fresh air, leading to reduced oxygen levels. Standard atmospheric conditions require around 19.5% to 23.5% oxygen concentration for safe breathing; anything below that can cause serious health risks, including unconsciousness or even death.

In underground settings like manholes, oxygen can be displaced by other gases, like carbon dioxide or methane, which are often produced during the decay of organic materials or due to the presence of certain chemicals. Proper monitoring and ventilation are essential to ensure safety before entering such spaces, highlighting the need for workers to be aware of these hazards.

Understanding the implications of oxygen deficiency also emphasizes the importance of training and appropriate safety measures in hazardous environments, ensuring that workers are equipped with knowledge about potential risks they might face in their roles.