Which environmental factor might contribute to discomfort during manual handling procedures?

The choice of tightly applied straps as a contributing factor to discomfort during manual handling procedures is understandable due to their potential to restrict movement and create pressure points on the body. When straps are too tight, they can lead to increased friction, pinching, and overall discomfort for the individual handling the load. This can impair the natural range of motion that is essential for safe lifting techniques and increase the risk of injury.

The other options present environmental factors that, while they can affect comfort, do not directly relate to the specific mechanics of manual handling in the same way. High humidity levels and cold temperatures can affect a person's overall comfort and well-being, potentially impacting energy levels and performance, but they are less directly linked to the immediate physicalities of manual handling tasks. Excessive noise can create distractions and increase stress but does not inherently interfere with the physical act of lifting or handling materials. In contrast, tightly applied straps directly interact with the individual's physical state during manual handling, making them a more significant concern in terms of comfort and safety.