Discuss the ventilation and illumination requirements in underground works.

Ventilation and illumination are critical components of safety in underground construction works. Proper ventilation ensures that workers have access to clean air while controlling harmful gases, dust, and heat accumulation. Underground environments often lack natural airflow, which can result in a buildup of hazardous gases like carbon monoxide and methane. To address this, mechanical ventilation systems such as fans and air ____ ______ _________ ______ ____.
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