Article: Carbon monoxide: how to avoid a deadly poison. (includes related article on using carbon monoxide detectors)

A poisonous gas was swirling all around them, and the two high school seniors didn't even know it. After all, that gas--carbon monoxide--is colorless, odorless, and tasteless. Within a few hours, the seemingly innocent substance would nearly snuff out their young lives.

The trouble began on a cold January night in Iowa City, Iowa. Michelle Unger and Cullin Schooley, both 18, were seated in a parked sport-utility vehicle that was missing a tailpipe. The engine was running, and as it did, the carbon monoxide (CO) seeped into the vehicle's cab.

The two friends complained to each other of fatigue and headaches--two warning signs of carbon monoxide poisoning. ...

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