QMRS Gas Practice Exam

The correct maximum permissible concentration of Carbon Dioxide (CO2) for coal mine workers is 1.25%. This limit is established based on health and safety regulations aimed at minimizing the risks associated with CO2 exposure in confined work environments like coal mines. At concentrations above this level, CO2 can lead to a range of health issues, including headaches, dizziness, increased heart rate, and, in severe cases, unconsciousness or even death.

Maintaining the CO2 concentration at or below 1.25% helps ensure the safety and well-being of workers, as the gas can displace oxygen, leading to a risk of hypoxia. This concentration is aligned with occupational health guidelines, ensuring that working conditions do not pose undue health risks to miners over extended periods of exposure. Understanding and adhering to these limits helps create a safer mining environment and protect the workforce's health.