Don't breathe; the air is poison. During what stage are firefighters exposed to large quantities of carbon monoxide?

So, you've put the fire out. You're in the clear, right? Wrong. The fumes from a recently-doused fire continue to be dangerous to those firefighters executing fire overhaul operations. Toxic vapors and gases are prevalent, including carbon monoxide. And when synergized with other chemicals that may be present, like hydrogen cyanide, a person's respiratory system can shut down completely. A firefighter is also put at risk for chronic or acute problems, like cancer or heart failure, when exposed directly to such particles.

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