Which of the following actions should be taken first if smoke is increasing rapidly?

When smoke is increasing rapidly, the immediate priority should be the safety of personnel. Evacuating personnel ensures that they are removed from potential danger, as smoke can be an indication of fire that poses significant health risks, including asphyxiation and exposure to toxic gases. The visibility may quickly decrease, and conditions can deteriorate rapidly, making it crucial to get everyone to safety before attempting to assess the situation or take further action.

By prioritizing evacuation, responders can prevent injuries and fatalities, allowing for a safer environment for further operations, such as assessing the source of the smoke or initiating suppression efforts. After ensuring that personnel are safely evacuated, the situation can then be evaluated, and additional resources can be requested to effectively handle the incident.