How do you assess atmospheric hazards in a burning building?

• A. Rely solely on visual inspection without meters.
• B. Use gas meters for oxygen, carbon monoxide, hydrogen sulfide; monitor heat and toxic gas levels; wear SCBA as needed.
• C. Measure only temperature with a pocket thermometer.
• D. Use only a smartphone app to estimate hazards.

Answer: (B)

In a burning building, the air can hide deadly hazards, so you need real-time measurements rather than just sight or intuition. Using gas meters that monitor oxygen, carbon monoxide, and hydrogen sulfide gives a clear picture of whether the air is breathable and whether toxic gases are present. Tracking heat levels alongside those gas readings helps you spot hot zones and assess how quickly conditions may worsen, guiding when to enter, vent, or retreat. Wearing a self-contained breathing apparatus as needed ensures you have safe air to breathe during interior work. Visual checks alone can miss invisible gases, measuring only temperature misses toxic air, and relying on a smartphone app isn’t reliable for critical hazard assessment.