What must the VO ensure regarding engine pollutants?

• A. Engine pollutants are not monitored
• B. The mine's atmosphere is monitored for internal combustion engine pollutants as required under the mine's safety and health management system
• C. Only monitored at surface
• D. Monitored only when required

Answer: (B)

Monitoring underground air quality for pollutants from internal combustion engines is essential for worker safety. Diesel and other engines emit contaminants such as carbon monoxide, nitrogen oxides, hydrocarbons, and diesel particulates, which can build up in mine air if not controlled. The VO must ensure the mine atmosphere is monitored for these pollutants as required by the mine’s safety and health management system (SHMS). That means following the SHMS provisions for how monitoring is done, how often, how results are recorded, and what actions to take if limits are reached. This approach ensures timely detection, appropriate ventilation adjustments, and changes in engine use to keep air quality within safe limits.

Why the other ideas don’t fit: monitoring is not optional or non-existent; it must occur, including underground, not just at surface; and it isn’t just done “when required” in a vague sense—it's required as specified by the SHMS, with defined methods, frequency, and actions.