What contaminants are tested for after a fire?

Fire residue testing looks for a mix of chemical and particulate contaminants. The main targets usually include:

• Soot and char particles – The black carbon dust left from incomplete combustion.

• PAHs (Polycyclic Aromatic Hydrocarbons) – Harmful organic compounds that form when materials burn at high heat.

• VOCs (Volatile Organic Compounds) – Gases released from burnt plastics, paints, or building materials.

• Acidic residues or chlorides – Corrosive substances formed from burning PVC or insulation.

Depending on the fire, additional testing might include heavy metals or asbestos fibres if older materials were disturbed. The goal is to identify health and corrosion risks before re-occupying or rebuilding.