11.   Koresh and his followers set fire to their Mount Carmel compound after FBI agents injected noxious CS gas into the structure in an effort to force them to surrender.

12.   Most doctors disapproved of the toilets, because they lacked a trap system that would keep noxious gases and offensive odors from entering the room through the toilet.

13.   Moreover, he noted, vegetation in a closed environment has a tendency to absorb the noxious gases around it.

14.   So before any of her crew enters a storm drain, they first test the quality of the air, making sure there are no noxious gases present.

15.   Still, Toyota officials said, it achieves significant reductions over gasoline-powered vehicles in use of greenhouse and other noxious gases.

16.   The air-fuel mixture is burned and converted into heat and noxious gases.

17.   The landfill has for five decades befouled the air of western Staten Island with noxious gases and has polluted the ground water with cyanide, pesticides and toxic waste.

18.   A court has asked the government to reduce emission of noxious gases from an oil refinery that is damaging the Taj Mahal, a newspaper reported Saturday.

19.   A dense white cloud of noxious gases shrouded the Mayon volcano Thursday and precariously perched ash piles swelled with rain as farmers toiled near its foot.

20.   But a series of strong ventings of noxious gases and ash that began Monday prompted authorities to order the evacuation of the southern half of the British Caribbean colony.