How are highly exposed personnel defined in terms of the smoke conditions they encounter?

Highly exposed personnel are defined by their interaction with thick smoke conditions, which presents a variety of hazards, including reduced visibility, extreme heat, and potential inhalation risks. In these conditions, the smoke contains higher concentrations of toxic particulates and gases, making it crucial for personnel to have appropriate training and equipment to safely operate and mitigate hazards. The presence of thick smoke indicates an intense fire or combustion, indicating an elevated risk level that demands careful consideration of safety protocols and protective measures for those involved. Being trained to recognize and respond to the dangers associated with thick smoke is essential for the safety and effectiveness of first responders.