Which of the following is crucial for mine shallow ventilation?

Regular maintenance of ventilation equipment is crucial for mine shallow ventilation because it ensures that the air circulation systems function efficiently and effectively. Proper ventilation is vital for maintaining safe air quality, controlling dust, and managing harmful gases often found in mining environments. Regular checks and maintenance help to identify and rectify issues such as blockages, leaks, or mechanical failures before they pose significant risks to the miners' health and safety.

In contrast, reducing the number of workers does not inherently improve ventilation quality and can create new safety challenges, such as increased isolation in emergency situations. Closing off unused areas of the mine may help in controlling airflow but does not address the need for maintenance and operational efficiency of the ventilation systems themselves. Similarly, using more explosive materials increases hazards and smoke, which can compromise air quality, further underscoring the importance of efficient ventilation management rather than introducing additional complications.