When combustion occurs during a fire, not all materials burn cleanly, resulting in smoke and soot. These waste products - solids, liquids, and gases - may be composed of various chemicals which are harmful to your health. Today’s modern structures hold an array of chemicals not found in early homes, including plastics, foams, fabrics, carpets, wood products, synthetic fabrics, wool, and asbestos-containing materials, which could result in health hazards that make fire restoration a dangerous and difficult task.