21.   The dense smoke from incinerated tree trunks stings the eyes, and predators like leopards and cougars are often close by.

22.   They burn for miles, while signs warn travelers not to drive into dense smoke.

23.   Police closed a nearby freeway because of dense smoke.

24.   A swirling column of dense black smoke still filled the street in front of the school long after the blast.

25.   A wall of dense black smoke rose near the West Bank town of Ramallah as Palestinians burned tires, blocking a main road.

26.   Air pollution caused by dense smoke from Indonesian forest fires hits an all-time high in Singapore.

27.   Air pollution, caused by dense smoke from Indonesian forest fires, hit an all-time high in Singapore Thursday night.

28.   Aircraft operations were suspended because of dense smoke.

29.   Both trucks caught fire immediately and dense black smoke quickly filled the tunnel and poured out of ventilation shafts.

30.   But with new space age technology, firefighters will soon be able to see through dense smoke.