Discuss various special air monitoring requirements in underground works.

Underground works pose unique challenges for air monitoring due to the confined and enclosed spaces involved. Monitoring air quality is important to protect workers' health and safety, prevent potential accidents and emergencies, and comply with regulations. In this discussion, we will highlight various special air monitoring requirements in underground works.

1. Oxygen levels: One of the primary concerns in underground works is the depletion of oxygen levels. When workers operate in a confined space with poor ventilation, the oxygen level may decrease, leading to potential suffocation. The Occupational Safety and Health Administration (OSHA) mandates a minimum of 19.5% oxygen levels in the air in confined spaces. Air monitoring equipment must be used to measure oxygen levels in the underground works to ensure the workers' safety.

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