What is fire residue and why is it dangerous?

Fire residue consists of the soot, ash, and chemical byproducts left behind after a fire. It can contain toxic substances such as heavy metals, polycyclic aromatic hydrocarbons (PAHs), and volatile organic compounds (VOCs). These particles can be harmful when inhaled or come into contact with skin, potentially causing respiratory issues, skin irritation, and long-term health effects.