1.   But now, he said, the soot was everywhere.

2.   If a unit is properly installed, there will be no soot.

3.   Klaus said that although there was soot, there was not, as investigators described it Thursday, a minor fire.

4.   Legator said it is important to compare readings on days when the smoke is absent with readings from days when soot is present.

5.   OK, Certuse said, suppose that if all that soot is a product of combustion and we can find no cause, no broken appliances.

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

7.   Soot was in the air.

8.   Soot is a factor in a number of respiratory ailments, including asthma.

9.   Soot is another matter, and seems a mystery to householders.

10.   Soot is dark, and absorbs solar radiation.