When selecting a respirator, which one of the following questions is NOT relevant?

The consideration of weather conditions is not directly relevant when selecting a respirator. While weather can affect overall job safety and comfort, such as temperature and humidity affecting how a respirator fits or feels, it does not influence the type of respiratory protection needed for specific contaminants.

In contrast, understanding the toxicity of the contaminant, the type of contaminant present, and the anticipated exposure time is crucial for selecting an appropriate respirator. The toxicity informs the level of respiratory protection required, the type of contaminant dictates the style and filtration system of the respirator, and the anticipated exposure time aids in determining whether a filtering facepiece or a powered air-purifying respirator is necessary for extended protection. Thus, those factors directly impact the selection process, making them essential considerations.