To reduce wildfire-smoke exposure indoors, close windows and doors, filter the air in one room, limit activities that add particles, and keep the room cool. A clean-air room can lower exposure, but it cannot guarantee that smoke stays out. If your home becomes dangerously hot with windows closed, move to a cooler place with cleaner air.
Set up one clean-air room
- Choose a room: Pick an interior room with as few windows and doors as possible, such as a bedroom. Close its windows and doors while smoke is present, and spend as much time there as practical.
- Run a portable air cleaner: Choose a portable HEPA air cleaner sized for the room. Run it continuously during smoky conditions; AirNow recommends the highest fan speed to maximize filtration. Avoid air cleaners that generate ozone.
- Keep the room cool: Use air conditioning, a heat pump, fans, or window shades as appropriate. Do not stay in a dangerously hot room just to keep smoke out.
AirNow describes clean-air rooms as a way to reduce smoke exposure, not eliminate it. Its guidance does not establish a specific percentage reduction in indoor exposure from these measures.
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Use central HVAC only as your system allows
If your home has central air, running the system can help filter indoor air. Use a MERV-13-or-higher filter only if your system can safely accommodate it; a higher-rated filter is not automatically suitable for every system.
- Select “Recirculate” and “On” rather than “Auto” if those controls are available.
- Close the fresh-air intake during smoke if your system has one.
- During heavy smoke, replace the filter more often than usual.
If you are unsure whether your system can handle a higher-efficiency filter or how to adjust it, ask a qualified HVAC professional.
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Reduce indoor particle sources
Smoke is not the only source of airborne particles. While outdoor smoke is affecting your area, avoid frying food, sweeping, vacuuming, smoking indoors, and using gas, propane, or wood-burning stoves and furnaces where feasible. These steps limit additional particles; they do not remove smoke that has already entered the home.
Know when to leave for cooler, cleaner air
If you cannot keep the room comfortably cool with windows closed, go to a clean-air shelter, another cooled building with good filtration, or a trusted friend or family member’s home. This is especially important for people at greater risk from smoke, including people with asthma, COPD or heart disease; children and teenagers; older adults (generally 65 and older); pregnant people; and people who are more likely to be exposed or have limited access to ways to reduce exposure.
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Check local smoke conditions
Use the AirNow Fire and Smoke Map to check fine-particle pollution (PM2.5), the main pollutant in wildfire smoke, along with smoke plumes, fire locations, and whether air quality is improving or worsening. Smoke conditions can change during the day, so check local advisories as well. AirNow says the map also includes smoke forecasts where available.
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Spend less time outdoors and avoid strenuous activity while smoke is present. Cloth masks do not protect against wildfire smoke. For unavoidable exposure, a closely fitting NIOSH-certified N95 or P100 particulate respirator can help reduce exposure to smoke and ash, according to the EPA public-health guide. Follow local emergency instructions and prioritize getting to cleaner indoor air.
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- 𝐏𝐑𝐎𝐓𝐄𝐂𝐓𝐈𝐎𝐍 𝐅𝐎𝐑 𝐀𝐋𝐋 𝐒𝐄𝐀𝐒𝐎𝐍𝐒 𝐀𝐍𝐃 𝐒𝐈𝐓𝐔𝐀𝐓𝐈𝐎𝐍𝐒: Ideal for homes with babies, pets, smokers, and those that cook often. Effectively filters wildfire smoke, seasonal pollen, vehicle exhaust, and humidity-triggered odors.
Official guidance and updates
AirNow’s “When Smoke is in the Air” page provides exposure-reduction guidance. Its wildfire smoke factsheets include June 2026 editions of “Reduce Your Smoke Exposure,” “How to Create a Cleaner Air Room at Home,” and “Indoor Air Filtration”; the factsheet page was updated September 1, 2026. AirNow’s map guidance explains the Fire and Smoke Map. The EPA’s 2026 public-health guide is a June 2026 interagency publication. Conditions and guidance can change, so check current official information and local alerts during a fire.
Quick Recap
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