Who is authorized to test air quality in worked-out areas of an underground mine?

The correct choice indicates that a qualified person is authorized to test air quality in worked-out areas of an underground mine. This is critical for ensuring the safety of all personnel in a mine setting. A qualified person possesses the necessary training and expertise to identify potential hazards, understand air quality standards, and operate the required equipment safely and effectively. Their role is essential in assessing the air quality to prevent health risks associated with poor ventilation, toxic gases, or harmful particulates that may accumulate in mined-out sections.

In contrast, while experienced miners may have valuable knowledge about the mine and its conditions, they may not necessarily have the formal training or certifications that a qualified person possesses. Surface foremen typically oversee surface operations and may not have the specific training required for air quality testing in underground environments. Furthermore, allowing a random staff member to conduct these tests poses a significant safety risk, as they likely lack the expertise needed to accurately assess air quality and respond to any potential hazards. Thus, designating a qualified person for this task is vital for maintaining a safe working environment in underground mines.