21.   It is extremely concentrated, has super fine particles, and may be resistant to some antiobiotics.

22.   It occurred to the scientists that fine particles of silica gel alone, which is used commercially as a drying agent, might produce sounds.

23.   Melissa Hart of the American Automobile Manufacturing Association points out that relatively few monitoring stations exist to track fine particles.

24.   Once the soot is in the furnace room, fine particles of it will be picked up by the air currents in the house.

25.   Outside of Washington, though, the new limits on smog and on emissions of fine particles of soot are generating more anxiety than anger in the business community.

26.   Pumping the sprayer vigorously four or five times, he produced a large cloud of fine particles that hung in the air like fog.

27.   Recent epidemiological studies link fine particles of soot to large numbers of premature deaths and respiratory and cardiovascular illnesses, particularly among the elderly.

28.   Sand is part way up the scale of particle size, larger than the very fine particles of clay and silt and smaller than gravel and pebbles.

29.   Several epidemiological studies link fine particles to large numbers of premature deaths and respiratory and cardiovascular illnesses, particularly among the elderly.

30.   Sources of fine particle pollution include diesels, cars, coal-fired power plants and industrial boilers.