| 41. | -- New U . S . rules on soot and smog.
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| 42. | They're black with soot made greasy by sweat.
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| 43. | Causes : Pipe smoking, exposure to large amounts of chimney soot.
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| 44. | Candelabra spew soot onto white-washed walls, creating instant age.
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| 45. | Sometimes the soot may appear even when the fireplace is not going.
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| 46. | Everything in the apartment was wet and covered with soot.
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| 47. | But now, he said, the soot was everywhere.
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| 48. | Soot and ozone are produced by factories, power plants and automobiles.
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| 49. | How is the soot getting on the suction side of the filters?
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| 50. | The soot can be caused by a combination of things.
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