31.   She loads the granules of dough into the fine strainer and shakes it to remove the small particles.

32.   So over time, the small particles tend to head downward and the large particles upward.

33.   Small particles showed up in the final coat.

34.   Such small particles would burn up in the atmosphere.

35.   Such findings point to an extremely dangerous kind of anthrax preparation, with small particles that can easily float in the air, officials and experts said.

36.   Sulfur prevents the use of some emissions controls and also leads to the formation of some varieties of small particles.

37.   The agency has long thought that small particles pose one of the biggest remaining health threats from air pollution because their size lets them infiltrate deep into the lungs.

38.   The EPA also focused on small particles, based on the scientific literature that said they were the greatest concern.

39.   The dust cloud that arises after an implosion, the researchers say, contains a lot of small particles of the kind that can cause lung damage.

40.   The EPA also is considering first-time limits on extremely small particles of dust and soot.