11.   Environmentalists have also criticised the dense smoke from buses which pollute the town centre.

12.   As flames and dense smoke engulfed the village, dark blue armored police vehicles pulled away from the deserted, ruined settlement.

13.   Dense smoke hampered firefighting aircraft from taking off, authorities said.

14.   Dense smoke often grounds government helicopters, forcing firefighters to slog for hours across mountainous terrain to reach fire lines.

15.   Dense smoke billowed through the store.

16.   Dense smoke covered the parkway, and the state police ordered it closed from Little Egg Harbor to Toms River.

17.   Dense smoke envelops the ship.

18.   Fires raging in the Lolo National Forest spilled plumes of dense smoke across central Montana lowering visibility to just a few miles.

19.   From the Pittsburgh airport, air traffic controllers saw dense smoke rising to the northwest.

20.   It shows dense smoke billowing above sturdy structures.