OSHA 10-Hour Construction ReviewHealth Hazards in ConstructionMedium
A construction worker is working outdoors in direct sunlight on a job site where the temperature is 90°F (32°C) with high humidity. Which of the following is the most effective engineering control to reduce the risk of heat stress for this worker?
- AImplementing a buddy system to monitor for heat stress symptoms.
- BProviding chilled water at the workstation.
- CScheduling frequent rest breaks in a shaded area.
- DUsing portable fans or air conditioners to cool the work area.
Show answer & explanationAnswer & explanation
Correct answer: D. Using portable fans or air conditioners to cool the work area.
Engineering controls are designed to remove the hazard from the environment. Using portable fans or air conditioners directly cools the work area, reducing the ambient temperature and humidity, which is the most effective engineering control among the choices for heat stress.
Why the other options are wrong
- A. A buddy system is an administrative control, not an engineering control.
- B. Providing water is an administrative control, not an engineering control.
- C. Scheduling breaks is an administrative control, not an engineering control.
Heat Stress Engineering Controls
Engineering controls for heat stress involve modifying the work environment to reduce heat exposure, such as increasing ventilation, providing air conditioning, or using radiant heat shields.
- Focus on modifying the source of heat or the environment.
- More effective than administrative controls or PPE alone.
- Examples include air conditioning, fans, and reflective barriers.
Memory trick: Engineering controls ENGINEER the environment safer!