Soot is harmful
The word "soot" sounds so simple and harmless. To some, it conjures up images of campfires and candles, and perhaps a charming dance number from Mary Poppins.
In fact, soot is anything but simple and is certainly not harmless.
Soot includes the fine black particles, chiefly composed of carbon, produced by incomplete combustion of coal, oil, wood, or other fuels. Soot can consist of acids, chemicals, metals, soils, and dust. The common trait of soot particles is that they are extremely tiny – 2.5 micrometers or smaller in diameter. This is smaller than dust and mold, and is about 1/30 the diameter of a human hair.