OSHA 10-Hour Construction ReviewHealth Hazards in ConstructionEasy
A construction worker is performing tasks that generate significant dust containing crystalline silica. Which of the following is the most effective engineering control to reduce the worker's exposure?
- AMandating frequent breaks for workers.
- BScheduling work during off-peak hours.
- CProviding N95 respirators to all workers.
- DImplementing wet methods to suppress dust.
Show answer & explanationAnswer & explanation
Correct answer: D. Implementing wet methods to suppress dust.
Wet methods are highly effective engineering controls that directly suppress dust at the source, preventing it from becoming airborne and significantly reducing worker exposure to silica.
Why the other options are wrong
- A. Frequent breaks do not reduce the concentration of silica dust in the air or prevent exposure during work periods.
- B. Scheduling changes do not directly reduce dust generation or exposure, only potentially the number of people exposed or duration.
- C. Respirators are personal protective equipment (PPE), which are lower on the hierarchy of controls than engineering controls.
Silica Dust Control
Crystalline silica dust, found in materials like concrete and mortar, can cause serious lung diseases. Engineering controls are preferred to minimize exposure.
- Inhalation of silica dust can lead to silicosis.
- Wet methods and local exhaust ventilation are key engineering controls.
- Respirators are used when engineering controls are insufficient.
Memory trick: Engineers PREVENT, People PROTECT.