The damage of soot
Soot is a mixture of very fine black particles created by the product of incomplete combustion. It is primarily made up of carbon, but it can also contain trace amounts of metals, dust, and chemicals. Soot is different from charcoal and other byproducts of combustion because it is so fine. These tiny particles may be under 2.5 micrometers in diameter which is smaller than dust, mold, and dirt particles.
The small size of soot is what makes it so dangerous for humans and pets. It can easily be breathed deep into the small passageways of the lungs. Repeated exposure to soot is linked to respiratory illnesses, heart disease, and cancer. Because of these problems, soot is more than just an unsightly nuisance. It is a danger that cannot be left in the home.