After a fire in a home it's very possible that contaminating smoke has touched every item and area in your home. In smoke, there are residual amounts of chemicals and other bi-products due to burning plastics and other chemical-based items in your home that may have burned in the fire. Those residual chemicals have been transferred by the smoke and is now left on your walls, furniture, floors, personal items, and other contents in your home. Even things like your light bulbs in your lamps must be decontaminated or disposed of properly.