Heat stress can result from which of the following combinations of factors?

Heat stress is a condition that occurs when the body cannot regulate its temperature effectively, often due to external environmental factors and physical exertion. The correct combination of factors that can lead to heat stress is workload, temperature, and airflow.

When an individual is engaged in physically demanding work (workload) in a hot environment (high temperature), the body generates heat from exertion while trying to cool itself. Airflow plays a critical role because adequate circulation of air helps dissipate heat through evaporation of sweat, which is essential for regulating body temperature. If the airflow is low or stagnant, sweat does not evaporate as effectively, increasing the risk of heat stress.

High altitude and low air pressure may affect oxygen availability but are not primary factors for heat stress. Extreme cold and humidity generally lead to different physiological responses and do not contribute to heat stress. Lastly, noise levels and electrical hazards are related to workplace safety but do not influence body temperature regulation in the context of heat stress. Thus, the identified factors of workload, temperature, and airflow directly correlate with the onset of heat stress, making this the accurate choice.