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What Is the Risk of Carbon Monoxide After a Fire?

Last updated October 25, 2026

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The short answer

Why Carbon Monoxide Lingers

Carbon monoxide forms when fuel burns without enough oxygen. During a fire, incomplete combustion produces this gas, which can be absorbed into porous materials like drywall, wood, and fabric. Even after flames are out, these materials can release carbon monoxide into the air for hours or days.

The risk is highest in basements, crawl spaces, and rooms with poor ventilation. If you smell smoke or see soot, carbon monoxide may be present. You cannot see or smell this gas, so your senses are not a reliable warning. A professional with a carbon monoxide detector is the only safe way to know if your air is safe.

Health Effects to Watch For

Breathing carbon monoxide can cause headaches, dizziness, nausea, and confusion. At higher levels, it can lead to unconsciousness or even death. Symptoms can appear quickly, especially in children, older adults, and people with heart or lung conditions. If you feel unwell, get to fresh air and see a doctor.

Low-level exposure over time can also cause long-term health problems. Even if you feel fine right after the fire, symptoms may develop later. Do not try to air out the house and then stay inside. Leave the home until a professional has tested the air and given you the all-clear.

  • Headache and fatigue
  • Dizziness or lightheadedness
  • Nausea or vomiting
  • Shortness of breath
  • Confusion or disorientation
  • Loss of consciousness at high levels

How Professionals Test for It

Local water damage pros use handheld carbon monoxide detectors to sample the air in different rooms and at different heights. They also check soot and smoke residue, which can hold carbon monoxide and release it slowly. This testing is part of a broader water damage inspection that looks at all fire-related hazards.

The pros may also use moisture mapping to find hidden pockets of moisture that can trap gases. They do not guess or rely on smell. Their equipment gives precise readings, and they can tell you whether your home is safe to occupy or whether you need to stay elsewhere while cleanup continues.

Protecting Your Family Right Now

Do not re-enter the home until a professional has given you the all-clear. If you must retrieve items, wear a mask and keep your visit short. Open windows and doors to air out the space, but do not rely on ventilation alone. Carbon monoxide can be trapped in furniture, carpets, and walls.

Install a battery-operated carbon monoxide detector in your home if you do not have one. This is a simple step that can save lives, even after the fire is out. If you live in Detroit, keep your detector batteries fresh and test it monthly. Your local fire department can also offer guidance on safe re-entry.

The Role of Fire Cleanup Pros

Fire cleanup involves more than removing soot and smoke smell. The pros use structural drying and dehumidification to remove moisture from walls and floors, which helps reduce the chance of gases being trapped. They also remove water-damaged materials that can harbor carbon monoxide and other toxins.

A thorough cleanup includes wiping down surfaces, cleaning ducts, and replacing porous materials like drywall and insulation. The pros do not just mask the problem; they address the source. After cleanup, they test the air again to confirm it is safe. This is the standard process for protecting your health.

If you have a flooded basement or water damage from firefighting efforts, the pros also handle emergency water extraction. Removing standing water quickly is important because it can spread contaminants and worsen air quality. A complete approach includes both water removal and air testing.

  • Air testing and monitoring
  • Structural drying and dehumidification
  • Removal of soot and smoke residue
  • Cleaning of HVAC ducts and vents
  • Replacement of porous materials
  • Final air quality verification

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Frequently asked questions

How long does carbon monoxide stay in a house after a fire?

Carbon monoxide can linger for several days, depending on how much soot and porous materials are present. It may be released slowly from walls, furniture, and fabrics. You should not re-enter until a professional tests the air. The exact time depends on the fire's size and the cleanup process.

Can I clean soot myself to reduce carbon monoxide risk?

Cleaning soot yourself can actually spread it and increase your exposure. Soot particles can hold carbon monoxide and other toxins. The safest approach is to leave the home and let the pros handle the cleanup. They have the right equipment and training to remove soot without putting you at risk.

Will a standard smoke detector alert me to carbon monoxide?

No, smoke detectors do not detect carbon monoxide. You need a separate carbon monoxide detector that uses an electrochemical sensor. These detectors are available at hardware stores and are inexpensive. Install one on every level of your home, especially near sleeping areas, and test it regularly.

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