Discuss the special air monitoring requirements in underground works.

Air monitoring in underground works is critical to ensure the health and safety of workers and to prevent the buildup of hazardous conditions. Specialized air monitoring requirements are necessary in these environments due to the unique challenges posed by limited ventilation, potential exposure to harmful gases, and confined spaces. Here are some key aspects of air monitoring in underground works:

1. Gas Monitoring:

   • Continuous monitoring of gases such as oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), methane (CH4), and hydrogen sulfide (H2S) is essential.
   • Oxygen levels should be maintained within safe limits (typically 19.5% to 23.5%) to prevent oxygen deficiency or enrichment.
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