OSHA 30 Hour Construction Program Practice Test

What must be done with smoke before entering a blasted tunnel?

1. Evacuate workers immediately

2. Allow smoke to dissipate

3. Use a ventilation system

4. Ensure all equipment is turned off

The correct answer is: Allow smoke to dissipate

Before entering a blasted tunnel, it is crucial to allow the smoke to dissipate for several important reasons. Smoke can be a significant hazard, as it often contains toxic fumes and can reduce visibility, making it difficult for workers to move safely and effectively. If workers enter the tunnel before the smoke has cleared, they could be exposed to harmful substances that could lead to health problems or accidents. Allowing smoke to dissipate helps ensure a safer work environment by minimizing the risks associated with inhalation of toxic fumes and facilitating better visibility for assessing the conditions inside the tunnel. This procedure is part of maintaining safety protocols and aligns with proper ventilation practices during construction activities in confined spaces. While evacuation, using a ventilation system, and ensuring equipment is turned off are also important safety procedures, these measures are generally employed to address the hazards created by smoke. However, the immediate step of allowing smoke to dissipate is essential for the safety of personnel before they enter potentially hazardous environments.