1.   The odor spread throughout the room.

2.   Noxious odor spread from the area, according to witnesses in the area.

3.   Noxious odor spread from the area, witnesses said.

4.   Noxious odor spread from the area of the thermal plant, according to witnesses in the area.

5.   Noxious odor spread from the area of the thermal plant, according to witnesses.