Who requires respirators when working in mines?

The need for respirators in mining environments is based on the levels of exposure that workers face. Miners exposed to hazardous conditions involving dust, gas, fumes, and mist need respiratory protection to prevent potential health risks associated with inhaling these harmful substances. Short-term exposure, while still dangerous, can lead to immediate respiratory issues or acute reactions, particularly if the concentrations of these elements are high.

Miners who only occasionally face exposure might not require a respirator at all times, as such equipment is typically designated for those working in environments where the air quality is significantly compromised even if for a brief duration. Thus, it highlights the importance of immediate protective measures in situations where hazards are present, regardless of the exposure duration. This is crucial for maintaining safety standards and ensuring the health of miners, which underlines why this choice is considered the correct answer.