Wildfire recovery
The fire is out and the walls are standing. But the danger you can't see has already moved indoors. Smoke and ash settle into your HVAC, your furniture, and your surfaces, and they keep off-gassing for weeks. Here's the calm, EPA-based way to clean it up and breathe easy in your own home again.
A standing house is not automatically a safe house. Wildfire smoke leaves behind fine particles and gases that soak into your HVAC system, soft furnishings, and surfaces. Confirm the structure is safe, then clean the right way — wet methods, HEPA filtration, and fresh MERV-13 filters — before you and your family settle back in. Do not dry-sweep, and keep the most vulnerable people out until it's done.
Why the air matters now
Wildfire smoke is a mixture of fine particles and gases from burning trees, homes, and everything inside them. Those fine particles are small enough to travel deep into your lungs — and even a healthy person can feel it. In the short term, smoke exposure can cause burning eyes, a runny nose, a scratchy throat, coughing, and bronchitis.
For people who already live with a condition, the stakes are higher. Wildfire smoke can aggravate chronic heart and lung disease and make existing symptoms noticeably worse. The people most sensitive to it are:
The settled ash matters too. Ash can irritate your skin, nose, and throat, and if it's disturbed and kicked back into the air, you can inhale it. That's why how you clean is just as important as whether you clean at all.
You can't see most of what makes smoke dangerous, and a home can look and even smell fine while fine particles still linger in the HVAC and soft goods. That's not a reason to panic — it's a reason to clean methodically and let the numbers, not your nose, tell you when you're done.
How it got inside
Even a closed-up house takes on smoke. There are three ways it works its way in — and once it's in, it settles and stays.
Open windows and doors let smoke drift straight indoors during and after the fire, even briefly.
Fans and your HVAC intake actively pull outdoor air — and its smoke — into the house and spread it room to room.
Smoke seeps through cracks and gaps around windows, doors, and the building envelope, no fan required.
Once inside, smoke particles and gases settle into your HVAC system, carpets, upholstery, curtains, bedding, and hard surfaces — and they can keep off-gassing for weeks. That's why a quick airing-out isn't enough, and why the cleanup below works from the inside out.
Do it in this order
Following the steps in order keeps you safe while you work and gets the most smoke and ash out of your home. Based on EPA guidance.
Before any cleaning, make sure the home is structurally safe to enter and occupy. If there's any doubt about safety, get professional eyes on it before you go in.
Wear an N95 respirator, gloves, long sleeves and long pants, and closed shoes before you disturb any ash or dust.
Children, older adults, and anyone with heart or lung disease should stay away from the work area while cleaning is underway.
Do not dry-sweep or dry-dust, which throws particles back into the air. Instead, lightly mist ash and dust with water, then gently wet-mop or wet-wipe it up.
Use only a vacuum with a HEPA filter. Standard vacuums can blow fine particles right back into the room.
Set up one or more portable HEPA air cleaners, sized for your rooms, and run them on high to pull fine particles out of the air as you work.
Switch your HVAC system to recirculate and fit a MERV-13 (or higher) filter if the system can handle it. Change it often during and after the smoke event.
Wipe down hard surfaces, launder soft goods like bedding, curtains, and washable upholstery, and clean inside cabinets and closets where particles collect.
Change your clothes and shoes before leaving the cleanup area so you don't carry ash into clean parts of the home.
Have your air ducts professionally cleaned only if they're visibly full of debris or the system is visibly pushing dust into the home. Routine duct cleaning isn't automatically required.
If you're not certain the home is safe to enter and occupy, don't guess. Fire can weaken structures, damage electrical and gas systems, and leave hidden hazards that a walkthrough won't reveal. Get a qualified professional to assess it before you start cleaning or move back in. Find an inspector near you to get a clear, unbiased read on your home before you commit to re-entry.
Your step-by-step
Work through re-entry at your own pace. Check off each step as you go, and keep the safe order in front of you so nothing gets skipped in the stress of coming home.
Common questions
A lingering smoke smell means fine particles and gases have settled into your HVAC system, soft furnishings, and surfaces, and are still off-gassing. Confirm the structure is safe, then clean thoroughly before spending long periods inside — especially if anyone in your household is a child, older adult, or has a heart or lung condition. The odor usually fades as you HEPA-vacuum, wet-wipe surfaces, launder soft goods, and run a portable HEPA air cleaner. If the smell persists after a full cleaning, have a professional evaluate the HVAC system and hidden cavities.
Never dry-sweep or dry-dust ash — that sends fine particles back into the air where they can be inhaled. Wear an N95 respirator, gloves, long sleeves and pants, and closed shoes. Lightly mist ash with water, then gently wet-mop or wipe it up, and vacuum only with a HEPA-filter vacuum. Keep children, older adults, and anyone with heart or lung disease out of the area during cleanup, and change your clothes and shoes before leaving the work area.
Fit your central HVAC system with a high-efficiency filter rated MERV-13 or higher if the system can handle it, set the fan to recirculate, and change the filter often. Add one or more portable HEPA air cleaners sized for your rooms and run them on high. Together, a MERV-13 filter on recirculate plus portable HEPA cleaners remove most of the fine particles that make wildfire smoke dangerous.
Not always. Have your ducts professionally cleaned only if they're visibly full of ash and debris, or if the system is visibly pushing dust into the home. Routine duct cleaning isn't automatically necessary after every smoke event. In the meantime, run the system on recirculate with a fresh MERV-13 filter and change it frequently.
Children, older adults, and people with heart or lung conditions such as asthma, COPD, or heart disease are the most sensitive. For these groups, even the fine particles and gases that linger inside a home can trigger burning eyes, coughing, or worsening symptoms. Keep vulnerable household members away from cleanup and out of smoke-affected areas until the home has been cleaned.
Keep going
Coming home after a fire is hard enough. Let us help you do it in the right order.
The Library gives you calm, evidence-based guides for cleaning up, testing your air, and knowing when your home is truly safe again — in plain English, with no products to sell you.
This page is education to help you understand and act on wildfire smoke in your home. It is not professional remediation, a structural safety assessment, or medical advice. When your home's safety or your health is uncertain, consult a qualified professional.