11.   But what about people who say they suffered respiratory distress from the dust cloud kicked up by the collapse of the World Trade Center, he asked?

12.   Coincidentally, an American research ship in the western Pacific engaged in a special experiment to measure atmospheric particles was able to sample the dust cloud several days ago.

13.   Dust clouds there had left astronomers working in a virtual fog.

14.   For example, the artillery unit moves like the real thing, leaving a dust cloud and tread marks in its wake.

15.   I accepted, buying a six-pack at inflated prices so we could better ward off the dust cloud generated by all the passing cars.

16.   Impact of the collapse coupled with this powerful downdraft provided the force to propel the giant dust cloud down nearby streets and around buildings, he said.

17.   In its new ad blending animation and real footage, Wile E. Coyote sees a speeding dust cloud in the distance.

18.   It photographed a dust cloud that could be giving birth to planets.

19.   Moments earlier his troops pulled the lanyard on their gun, sending a round toward a Taliban position and sending up a huge dust cloud around the gun position.

20.   Now the dust cloud, which has browned snow in Alaska and altered skies in Florida, is scheduled to float over New England.