Response to a large building collapse requires protection different than what emergency responders are typically provided. The hazards following the collapse of a large multi-story building are larger and more uncertain, and the duration of the response is much longer than usual.
The most challenging risks that emergency responders need protection from are hazardous chemicals that they could inhale. These hazards are the most difficult to identify and the equipment used to protect responders from them can be the most cumbersome.