carbon monoxide
carbon monoxide gas
CO

In a sense, the effect was like that of carbon monoxide.

The carbon monoxide was, of course, a new thought to me.

The rules also set a lower level for carbon monoxide.

Two hours later, the carbon monoxide was gone and people were allowed to return to the building.

The level of carbon monoxide in the air fell 25 percent between 1979 and 1988.

There will, however, be an increase in carbon monoxide, he said.

But finally, last month, the hospital said new tests had found high levels of carbon monoxide.

Carbon monoxide killed over 1,000 Washington residents between 1990 and 2005.

He was being treated for high levels of carbon monoxide.

There was no carbon monoxide with the air cars, thank God for that.