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To reduce wildfire-smoke exposure indoors, close off a comfortable room, filter its air with a properly sized cleaner or a compatible HVAC system, and avoid activities that add particles. Keep the home cool and follow local air-quality and emergency alerts: filtration can reduce exposure, but it cannot make a home smoke-proof or replace an evacuation order.
Start with current conditions and immediate safety
Wildfire smoke contains fine particles that can affect the eyes and respiratory system. Smoke levels can change quickly, so check AirNow or your state or local air-quality agency, and pay attention to emergency alerts. Follow evacuation instructions; setting up a cleaner-air room is only appropriate when it is safe to remain at home.
Children, older adults, pregnant people, and people with heart or lung disease may be more vulnerable to smoke. EPA advises people with heart or lung disease to talk with their health-care provider about what to do during smoke events. If smoke remains high indoors or your home becomes too hot to stay in safely, move to a cleaner-air location rather than relying on filtration alone.
Use current outdoor conditions to decide when to close up, when to ventilate, and whether staying home is reasonable. A clear-looking sky does not guarantee clean air, and a fixed schedule is not reliable because wind and fire behavior can change conditions quickly. Keep alerts available on a phone or other device, and reassess if anyone develops breathing trouble, chest discomfort, unusual fatigue, or other concerning symptoms.
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Choose the right filtration approach for your home
There are three practical options: a portable air cleaner for a room, filtration through a compatible central forced-air HVAC system, or a temporary do-it-yourself box-fan cleaner. A home may use a portable cleaner and HVAC filtration together. The right choice depends on the space you need to protect, the system your home can support, and whether you can keep the equipment running.
| Approach | Where it helps | Key selection or use check | Important limit |
|---|---|---|---|
| Portable air cleaner | The room where the unit operates | Smoke CADR should be at least two-thirds of the room’s floor area in square feet; prefer CARB-certified units. | Higher fan settings can be noisy; its rating applies to a room, not automatically the whole home. |
| Central forced-air HVAC filter | Air circulated through the home by the system | Use MERV 13 or higher only if the equipment can handle it; run the fan as often as possible. | A filter that is too restrictive may not suit the system. |
| DIY box-fan cleaner | A temporary room-level option | Use a newer fan marked UL or ETL and a high-efficiency filter, preferably MERV 13 or higher. | Performance varies with design and assembly; EPA does not recommend it as a permanent substitute for a commercial cleaner with known performance. |
Compare options on more than advertised square-foot coverage. Look for the tobacco-smoke CADR, whether the filter fits your HVAC equipment, the possibility of ozone from a portable unit, operating noise, and how consistently you can run and maintain the device. A commercial cleaner generally offers a known CADR, while a DIY build can cost less but has more variable performance and may be louder.
Set up a cleaner-air room
- Pick a room people can actually use. Choose a space large enough for household members to stay comfortably for an extended period. A bedroom with an attached bathroom can be useful if it suits your home. If possible, select a room that can be closed off from the rest of the house.
- Close its windows and doors. Keep the room closed to limit smoke entering from outdoors or other parts of the home. Do not block an emergency exit or otherwise compromise your ability to leave quickly.
- Put the cleaner where it can operate in that room. Size the portable unit using its smoke clean air delivery rate (CADR), or use compatible HVAC filtration to circulate air. If your household has only one cleaner-air room, spend as much time there as practical.
- Keep conditions comfortable enough to stay. Plan for noise, sleeping, cooling, and the number of people using the room. A cleaner that is too loud to run at an effective setting, or a room that becomes too hot, may not be a workable refuge.
The room is a place to reduce exposure, not a sealed shelter. Leave a safe path to the outside, keep necessary medications and phones available, and make sure everyone knows when to leave if emergency instructions change. If the room cannot accommodate the household, choose the largest practical space that can be closed off and consider whether a cleaner-air location elsewhere is safer.
Size a portable air cleaner by smoke CADR
CADR is the clean air delivery rate shown for a portable air cleaner. For wildfire smoke, compare the tobacco-smoke CADR on the unit with the room’s floor area. EPA’s rule of thumb is a smoke CADR of at least two-thirds of the room area in square feet. For example, a 150-square-foot room calls for at least 100 smoke CADR; a 300-square-foot room calls for at least 200. A 200-square-foot room would call for about 134 smoke CADR when rounded up. These are calculations from EPA’s sizing rule, not performance guarantees for a particular home.
Use the floor area of the room the cleaner is meant to serve. If a product lists coverage in a different way, check its smoke CADR rather than assuming that a generic coverage claim is equivalent. EPA recommends choosing a CARB-certified portable cleaner to select a unit that produces little or no ozone. That guidance does not mean every air cleaner is ozone-free.
If the room is unusually open to adjoining areas, a unit sized only to the enclosed floor area may not keep up with the additional air volume. Closing the connecting door, when safe, makes the CADR comparison more meaningful. A single portable cleaner is intended for the room where it runs; moving it from room to room means the other spaces are no longer receiving its filtration.
Once selected, run the cleaner continuously on the highest setting you can tolerate. Higher settings generally move more air but may be noisier, so account for actual use—not just the maximum setting printed on a box. Check the filter regularly and replace it when dirty. During heavy smoke, it may need replacement sooner than its normal schedule. A clogged filter can reduce airflow, so do not wait for a routine calendar date if the filter visibly loads with smoke particles.
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EPA’s guidance states: “Choose a PAC with a clean air delivery rate (CADR) for tobacco smoke that is at least two-thirds of the room area in square feet.” Use that rule for a consistent comparison rather than relying on marketing terms such as “whole-room” or “extra-large coverage.”
Use central HVAC filtration only when the system supports it
If your home has a central forced-air system, EPA recommends a MERV 13 or higher filter when the system can accommodate it. MERV is the filter-efficiency rating; a higher rating is not automatically the right choice for every furnace or air handler. Before upgrading, confirm the allowed filter type and dimensions with the equipment manufacturer or an HVAC professional. A filter that is too restrictive can be unsuitable for a given system.
Check the existing filter’s size and installation direction before buying a replacement. The filter must fit the slot and seal well enough that air does not bypass it. Do not force a thicker or denser filter into a compartment that was not designed for it. If you are unsure whether the blower can handle MERV 13 or higher, ask the manufacturer or an HVAC professional instead of guessing.
During smoky periods, run the HVAC fan as often as possible. If the controls offer fan settings, “On” rather than “Auto” is the typical way to keep air circulating more consistently. If the system has a fresh-air intake or outside-air option, use recirculation or close that intake when appropriate for the equipment and conditions. Do not assume every home has the same controls; consult the system’s instructions if you are unsure how to change them.
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Build a temporary box-fan cleaner carefully
EPA allows a DIY box-fan cleaner as a temporary, lower-cost alternative when a commercial cleaner is unavailable or unaffordable. EPA’s cleaner-air-room guidance says to use a newer box fan made since 2012 with a UL or ETL mark. Pair it with a high-efficiency filter, preferably MERV 13 or higher.
- Check the fan and filter. Use a fan bearing the UL or ETL mark and a high-efficiency filter. Confirm the filter fits the fan arrangement you are using.
- Orient airflow correctly. Match the filter’s airflow arrows to the direction air moves through the fan setup.
- Seal gaps. Close gaps between the filter and fan so air does not simply bypass the filter.
- Use it as a temporary room cleaner. DIY performance can vary with the filter, fan, sealing, and assembly. Do not treat one build’s reported result as a guarantee for your room, and do not assume a DIY assembly performs like a commercial unit with a known CADR.
EPA summarizes findings in which a DIY cleaner in a larger room reduced PM2.5 by about 56% after 90 minutes, and one in a smaller room reduced it by about 99% within 60 minutes during a wildfire-smoke event. Those are reported study results for particular rooms and conditions, not promised reductions for every design or home.
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A DIY cleaner is a temporary option, not a reason to ignore fan condition, filter loading, noise, or safe cooling. If the assembly is too loud to run, has obvious gaps, or cannot keep the room comfortable, a commercial portable cleaner or a cleaner-air location may be more practical.
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Keep windows and outside-air openings closed where appropriate while outdoor smoke is bad. If your cooling equipment offers a fresh-air setting, use recirculation when appropriate. An exhaust fan or range hood can pull air from elsewhere into the home, so use it only briefly when necessary during smoky conditions.
Some ordinary household activities add particles that make indoor air harder to keep clean. While smoke is present, avoid:
- Smoking or vaping.
- Burning candles or incense.
- Using aerosol sprays.
- Wood-burning or gas combustion.
- High-temperature cooking, including frying or broiling.
- Ordinary vacuuming. EPA identifies a vacuum with a HEPA filter as the exception.
Damp wiping or mopping can collect settled dust. It does not replace filtration, but it avoids stirring settled material into the air in the way ordinary vacuuming can. Postpone dusty projects and other activities that are not necessary until outdoor air improves, when practical.
Use a range hood or bathroom exhaust only for a necessary, brief task because exhausting indoor air can draw smoky outdoor air through leaks or other openings. Do not create additional combustion indoors to heat, cook, or generate light. These steps reduce sources inside the home while the cleaner removes particles that have already entered.
Balance filtration with cooling
Keeping smoke out is not the only safety concern: heat is also a risk. Use air conditioning, fans, or other safe cooling while limiting outdoor-air intake when smoke is bad. EPA cautions that single-hose portable air conditioners can draw smoke into a home, so use them sparingly in smoky conditions.
Fans move air but do not remove smoke particles. Use them with filtration and safe temperature control rather than as a substitute for a cleaner. Keep the cleaner-air room comfortable enough for sleeping and for people who are sensitive to heat. If an air conditioner or fan depends on electricity, have a plan for what you will do if power is lost.
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If the home cannot be kept cool, power is lost, or smoke continues to enter despite your efforts, consider staying with friends or family, using a public cleaner-air shelter, or going to a large air-conditioned building with good filtration. Do not remain in an unsafe or excessively hot home just to keep the windows shut.
Air out the home when outdoor air improves
When outdoor air quality improves, even temporarily, EPA advises airing out the home to clear remaining smoky air. Check current local conditions before opening windows rather than relying on a fixed time of day or assuming the smoke has passed. Close up again if conditions worsen.
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Compare the options before you buy or build
Use the same questions for every approach:
- What area must be protected? A portable cleaner or DIY fan serves a room. Central HVAC can serve connected spaces when the fan runs and the system supports the filter.
- What performance number is available? For a portable cleaner, compare tobacco-smoke CADR with two-thirds of the room’s square footage. A DIY assembly does not have the same standardized CADR information.
- Can the equipment handle the filter? Confirm HVAC compatibility before selecting MERV 13 or higher. For a portable unit, verify that replacement filters are available and fit properly.
- Could the device add ozone? Prefer a CARB-certified portable cleaner according to EPA’s guidance. Do not assume that every purifier is ozone-free.
- Will people run it consistently? Higher fan speeds may clean faster but can be louder. A quieter setting that runs continuously may be more usable than a maximum setting that household members turn off.
- What is the maintenance burden? Check filters regularly and replace them when dirty. Heavy smoke can shorten the interval. DIY builds also require checking seals and fan condition.
- What is the cost tradeoff? A DIY box-fan cleaner may be a lower-cost temporary choice, while a commercial unit offers more standardized performance. Neither option makes the home smoke-proof.
A practical routine during a smoke event
- Check alerts and air quality. Confirm that staying home is safe and note whether conditions are improving or worsening.
- Choose the cleaner-air room. Close windows and doors without blocking emergency egress, and move household members there when practical.
- Start filtration. Run a properly sized portable cleaner, a compatible HVAC system, or a temporary DIY unit. Use recirculation when appropriate and limit fresh-air intake.
- Remove indoor sources. Stop smoking or vaping, avoid candles and incense, postpone frying or broiling, and avoid ordinary vacuuming.
- Manage heat. Use safe cooling and watch for rising indoor temperature. A hot home is not a safe success story.
- Recheck equipment. Look at filter condition, airflow, noise, and whether the room remains usable. Replace dirty filters sooner than the normal schedule.
- Reassess your location. If smoke or heat cannot be controlled, leave for a cleaner-air place. When outdoor air improves, ventilate briefly and then continue monitoring.
Common mistakes to avoid
- Choosing by a vague coverage claim. Use tobacco-smoke CADR and the two-thirds-of-floor-area rule instead.
- Installing MERV 13 without checking the system. Compatibility comes first; a denser filter may not suit the blower or filter slot.
- Assuming one portable unit cleans the entire house. Its rating applies to the room where it operates.
- Turning the cleaner off whenever it is noisy. Use the highest tolerable setting and account for actual, continuous use.
- Using a fan or open window as the only response. Fans do not filter particles, and open windows can increase smoke entry while outdoor air is poor.
- Running combustion or high-particle activities indoors. Smoking, candles, aerosols, frying, broiling, and ordinary vacuuming can worsen indoor air.
- Ignoring temperature. Keeping windows shut is not enough if the home becomes dangerously hot.
- Treating a reported percentage reduction as a guarantee. Results vary with room size, design, sealing, airflow, and outdoor conditions.
What indoor filtration can—and cannot—do
A portable cleaner, a compatible HVAC filter, or a DIY cleaner can reduce indoor particle exposure when used appropriately. None guarantees removal of all smoke or a particular health outcome. Their effect depends on room size, airflow, equipment compatibility, filter condition, how consistently the system runs, and whether smoke continues to enter.
Use filtration as one part of a response: keep a cleaner-air room, limit activities that add particles, maintain safe cooling, and follow local air-quality and emergency guidance. If those measures are not enough to keep the home safe, leave for a cleaner-air location.
Frequently Asked Questions
How can I reduce my exposure to smoke when indoors at home?
Check current air-quality and emergency alerts, close windows and doors, spend time in a designated cleaner-air room, run a properly sized portable cleaner or compatible HVAC filtration, and avoid indoor activities that add particles. Leave if the home cannot stay cool or smoke exposure remains high.
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EPA’s rule is a tobacco-smoke CADR of at least two-thirds of the room area in square feet. A 150-square-foot room needs at least 100 smoke CADR; a 300-square-foot room needs at least 200.
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Is a MERV 13 filter safe for every HVAC system?
No. Use MERV 13 or higher only when the furnace or air handler can accommodate it. Confirm the allowed filter type and dimensions with the manufacturer or an HVAC professional.
Should I set my HVAC fan to On or Auto during wildfire smoke?
During smoky periods, EPA advises running the fan as often as possible. Selecting “On” instead of “Auto” typically circulates air more consistently, provided the system is operating normally.
Are all portable air purifiers ozone-free?
No. EPA recommends choosing a CARB-certified portable cleaner to select a unit that produces little or no ozone. Do not assume every purifier has the same emissions profile.
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Can I make a box-fan air cleaner?
EPA allows a DIY box-fan cleaner as a temporary, lower-cost alternative. Use a newer fan made since 2012 with a UL or ETL mark, a high-efficiency filter preferably MERV 13 or higher, correctly oriented airflow arrows, and sealed gaps. Performance varies, so it is not a permanent substitute for a commercial cleaner with known CADR.
Should I run the range hood while wildfire smoke is outside?
Use a range hood or other exhaust fan only briefly when necessary. Exhausting indoor air can draw smoky air from outdoors or elsewhere into the home.
Can I open windows to clear smoke from my home?
Wait until outdoor air quality improves, even temporarily, and check current local conditions before opening windows. Air out the home, then close it again if smoke worsens.
What if my home is too hot with the windows closed?
Use safe cooling, but do not stay in an excessively hot home. Consider friends or family, a public cleaner-air shelter, or a large air-conditioned building with good filtration if you cannot keep the home cool.
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How often should I change filters during a smoke event?
Check filters regularly and replace them when dirty. Heavy smoke can load portable and HVAC filters sooner than their ordinary replacement schedule.
Does indoor filtration remove all wildfire smoke?
No. Filtration can reduce particle exposure but cannot guarantee a smoke-proof home or a particular health outcome. Results depend on room size, airflow, filter condition, equipment compatibility, and continued smoke entry.
The Bottom Line
Create one usable cleaner-air room, close it off without blocking an escape route, and run filtration sized for that space. Use MERV 13 or higher only when your HVAC system supports it; choose portable cleaners by tobacco-smoke CADR and prefer CARB-certified units. Avoid adding particles, keep the home safely cool, monitor local conditions, and leave for a cleaner-air location if smoke or heat cannot be controlled.
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