Which CO concentration triggers evacuation and contact with authorities?

Which CO concentration triggers evacuation and contact with authorities?

• A. Increase ventilation
• B. No action
• C. Evacuate and contact authorities
• D. Stop work

Answer: (C)

When carbon monoxide is detected, the top priority is to get people away from the source and bring in professionals to handle the situation. CO is colorless and odorless, and exposure can worsen quickly, so evacuation protects occupants from ongoing risk. After everyone is safe, authorities or building management can shut off the source, assess the area, and determine when it’s safe to re-enter. Simply increasing ventilation won’t reliably remove CO or prevent harm, and stopping work without securing the source doesn’t address the danger. Doing nothing is not an option when a CO alarm is sounding.

When carbon monoxide is detected, the top priority is to get people away from the source and bring in professionals to handle the situation. CO is colorless and odorless, and exposure can worsen quickly, so evacuation protects occupants from ongoing risk. After everyone is safe, authorities or building management can shut off the source, assess the area, and determine when it’s safe to re-enter. Simply increasing ventilation won’t reliably remove CO or prevent harm, and stopping work without securing the source doesn’t address the danger. Doing nothing is not an option when a CO alarm is sounding.