When particle pollution is high, cut exposure first: check your current local AQI and official alerts, postpone strenuous outdoor activity, and spend less time outside. Indoors, keep polluted air out when it is safe to do so, run compatible central HVAC filtration or a room-sized portable air cleaner, and avoid creating more particles. A well-fitting NIOSH-approved N95 can reduce wildfire-smoke exposure when going outside is unavoidable, but it does not make hazardous exercise or prolonged exposure safe.
What should I do when particle pollution is high?
Use a short cycle of checking, reducing, filtering, and rechecking. Particle levels can change substantially over a single day, especially during a wildfire, so one morning reading is not a guarantee for the afternoon. The U.S. Environmental Protection Agency’s AirNow guidance recommends using current conditions to decide whether outdoor activity is appropriate, then adjusting plans as the AQI changes.
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- Check the current AQI and NowCast. Use AirNow’s AQI information, your local official air-quality service, and local emergency alerts. During wildfire smoke, consult the AirNow Fire and Smoke Map, which reports fine-particle pollution (PM2.5) and smoke information.
- Reduce outdoor time and exertion. Postpone running, strenuous sports, yard work, and other activities that make you breathe faster. If you must work outside, shorten shifts outdoors and plan frequent breaks in a cleaner-air indoor space.
- Make one indoor area cleaner. Close windows and doors when that will not create a heat hazard, run compatible central HVAC filtration, or use a portable air cleaner sized for the room.
- Stop adding particles indoors. Avoid frying, sweeping, vacuuming, and burning gas, propane, or wood when smoke is already affecting outdoor air.
- Recheck conditions and indoor temperature. If smoke worsens, your home overheats, or you cannot maintain cleaner indoor air, move to a suitable air-conditioned building or clean-air shelter.
This article focuses mainly on wildfire smoke because that is where the cited AirNow advice is most specific. Particle pollution from traffic, dust, industrial sources, or local fires can require additional instructions from your local health or environmental agency.
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How to check AQI, NowCast, and smoke conditions
The AQI is a decision aid, not a permanent forecast. AirNow’s NowCast uses recent hourly observations. When conditions are stable it uses longer averaging; when pollution changes rapidly, such as during a wildfire, it gives more weight to recent hours. That makes it useful for deciding whether now is a reasonable time to go outside, but you should still check again before a planned activity.
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Use the local reading, not a distant city average
Smoke can be concentrated in one neighborhood and clear in another. Check the monitor or forecast serving your location, then look for local fire, health, and emergency-management alerts. A regional AQI map can show the broad pattern, while a nearby monitor or official NowCast is more useful for an immediate decision.
Recheck before and during outdoor plans
Set a reminder to look again before commuting, exercising, or starting outdoor work. Wind shifts, a new fire plume, or changing atmospheric mixing can alter particle levels. If the reading is worsening, treat that trend as a reason to shorten or cancel the activity rather than waiting for a more convenient time.
Can I exercise outdoors when the AQI is unhealthy?
When particle pollution is high or smoke is visible, choose rest, indoor activity with clean air, or a lower-intensity alternative. AirNow advises limiting outdoor exercise, waiting for better air, and rescheduling outdoor work where possible. Exercise increases breathing rate and the amount of air drawn into the lungs, so a hard workout can produce much more exposure than a brief, easy errand at the same outdoor concentration.
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For planned exercise
- Check the AQI immediately before leaving and again if conditions are changing.
- Move the workout indoors only if the building’s air is cleaner; an indoor space that is also smoky is not a solution.
- Choose gentle movement rather than intervals, racing, hill repeats, or other efforts that cause heavy breathing when outdoor air is poor.
- Reschedule to a period with better air instead of using a respirator as permission to train harder or stay out longer.
For outdoor work or essential travel
If work cannot be postponed, limit the time outside, take regular breaks in a cleaner-air location, and use a properly fitting N95 as supplemental protection when wildfire smoke is the hazard. Employers and local authorities may issue more specific requirements for a particular site or task. A mask does not remove the need to reduce the duration and intensity of exposure.
For children and organized activities
Do not assume a team practice, school event, or playground visit is safe because it is scheduled. Check local guidance and move activities indoors only when the indoor air is cleaner. AirNow’s smoke guidance notes that respirators are not sized for children, so do not treat an adult N95 recommendation as a general child solution.
Should I wear a mask outside when the air quality is bad?
For unavoidable time outdoors in wildfire smoke, a well-fitting NIOSH-approved N95 respirator can reduce exposure. AirNow states that “N95 respirator masks can provide protection from wildfire smoke,” while “cloth masks will not protect you from wildfire smoke.” Read the full AirNow smoke guidance for the current public-health advice.
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What makes the recommendation useful
- Use the right type. A NIOSH-approved N95 is designed to filter fine particles. A cloth face covering is not a substitute for it during smoke.
- Fit matters. Gaps around the nose, cheeks, or chin allow smoky air to bypass the filter. Follow the respirator’s fitting instructions and replace it when it is damaged, dirty, difficult to breathe through, or no longer seals.
- Use it for unavoidable exposure. Examples include a necessary trip, an emergency, or outdoor work that cannot be rescheduled. The first choice remains less time and exertion outside.
- Keep vulnerable people in mind. Respirators are not sized for children, and people with breathing or heart conditions should follow their clinician’s advice about whether they can safely wear one.
An N95 is not a license to exercise outdoors at a high AQI. It does not filter every gas or vapor in smoke, does not make prolonged exposure harmless, and cannot compensate for a poor fit. If you can postpone the trip or move the activity to cleaner air, do that instead.
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Usually, closing windows and doors during a smoke episode helps keep outdoor particles from entering, but it is not an unconditional rule. AirNow warns that a home without air conditioning can become dangerously hot when windows remain closed during extreme heat. You must balance smoke reduction against heat safety.
When closing windows is sensible
If indoor temperature is safe and you can run filtration, close windows and exterior doors while smoke is present. Turn off or close a mechanical fresh-air intake if your system has one and the equipment instructions allow it. Avoid opening a window briefly “for ventilation” when the outdoor air is the pollution source; that can bring particles indoors faster than your filter removes them.
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When a closed home becomes unsafe
If the home becomes too hot, if you have no way to cool it, or if indoor air cannot be kept cleaner, relocate to a clean-air shelter, another large air-conditioned building with good filtration, or a suitable friend’s or family member’s home. AirNow’s guidance on smoke and health is available at Fires and Your Health. Do not trade a smoke problem for dangerous heat exposure.
How to filter indoor air with central HVAC
A central heating, ventilation, and air-conditioning system can continuously filter air throughout the home if the system and filter are compatible. AirNow recommends a high-efficiency filter rated MERV-13 or higher when the equipment can handle it. Confirm the rating and installation limits in your HVAC documentation or with a qualified technician; not every system can use every filter thickness or resistance.
- Check the filter slot and equipment manual. Verify the permitted size, thickness, and maximum filtration rating.
- Install a compatible MERV-13-or-higher filter. Follow the airflow arrow and ensure the filter seats without gaps.
- Set the fan to run continuously if practical. AirNow’s smoke guidance recommends a setting such as On rather than Auto so air is filtered more consistently while the system is operating.
- Use recirculation. Select Recirculate instead of bringing smoky outdoor air inside. If there is a fresh-air intake, close it during smoke when the system instructions permit.
- Inspect and replace the filter as needed. Heavy smoke loads can clog a filter faster than normal. Replace it according to the equipment guidance and whenever airflow is restricted or the filter is visibly loaded.
Running a fan cannot remove particles if the system has no filter or if smoke is continuously introduced through an open intake. Filtration also does not make it safe to open windows during a smoke plume.
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How to choose and use a portable air cleaner
A portable air cleaner treats one room or defined area rather than an entire house. AirNow’s Be Smoke Ready guidance says to choose a unit appropriate for the room; models vary in efficiency, operating noise, and filter-replacement needs. A room-sized HEPA unit is a practical option for a cleaner-air room, but match its published capacity to the room’s size.
Set up a cleaner-air room
- Choose a room where people can spend several hours with windows and doors closed.
- Place the cleaner where air can circulate freely; do not block its intake or outlet with furniture or curtains.
- Run it continuously or at the highest tolerable setting during the smoke period, following the manufacturer’s operating instructions.
- Keep the door closed when possible and avoid particle-producing activities in that room.
- Check the filter and replacement schedule. A saturated filter reduces airflow and cleaning performance.
A cleaner-air room is particularly useful for people at higher risk, including people with heart or lung disease, older adults, children, and pregnant women. It is not a substitute for leaving a home that is dangerously hot or otherwise unsafe.
Which option fits the exposure problem?
| Option | What it addresses | Important conditions |
|---|---|---|
| Reduce outdoor time and exertion | Direct inhalation of polluted outdoor air | Best first step; postpone strenuous activity and take clean-air breaks. |
| NIOSH-approved N95 | Unavoidable outdoor wildfire-smoke exposure | Requires a good fit; not a substitute for reducing time outside; not sized for children. |
| Central HVAC filtration | Particles entering and circulating through the home | Use a compatible MERV-13-or-higher filter, recirculation, and suitable fan settings. |
| Portable air cleaner | One room or defined indoor area | Choose capacity for the room and maintain the filter. |
| Relocation | Homes that are too hot or cannot provide cleaner air | Use a clean-air shelter or suitable air-conditioned building with good filtration. |
How to reduce particles you create indoors
Closing windows does not help much if indoor activities keep generating fine particles. During smoke episodes, AirNow recommends avoiding or minimizing frying foods, sweeping, vacuuming, and use of gas, propane, or wood-burning stoves and furnaces. Choose cooking methods that produce less smoke, postpone dusty chores, and use a cleaner-air room for rest rather than as a place to perform particle-producing tasks.
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Special planning for people at higher risk
AirNow identifies people with heart or lung disease, older adults, children, and pregnant women as groups for whom a cleaner-air room is especially useful. Plan before smoke arrives: identify the room with the best filtration, obtain compatible replacement filters, decide where you could relocate if the home overheats, and save local alert channels. Follow an individual clinician’s plan for respiratory or cardiac conditions; public AQI advice does not replace personalized medical instructions.
Common mistakes and safer corrections
- “The AQI was acceptable this morning, so it will stay that way.” Recheck NowCast and local alerts because wildfire conditions can change quickly.
- “A cloth mask is good enough.” AirNow says cloth masks will not protect against wildfire smoke; use a properly fitting N95 only for unavoidable exposure.
- “The mask means I can run outside.” Reduce exertion and time first; a respirator is supplemental protection, not permission for strenuous activity.
- “Any high-rated HVAC filter will work.” Confirm compatibility with your system before installing a MERV-13-or-higher filter.
- “Closing every window is always safest.” Monitor indoor heat. Move to a cooler cleaner-air location if a closed home becomes dangerous.
- “A portable cleaner cleans the whole house.” It is designed for a single room or area; size and placement determine where it helps.
Sources and scope
The practical recommendations here are based on U.S. EPA AirNow guidance: When Smoke is in the Air, Be Smoke Ready, Using Air Quality Index, the Fire and Smoke Map information, and Fires and Your Health. AirNow also publishes the June 2026 Wildfire Smoke: A Guide for Public Health Officials. These pages were checked October 13, 2026. Local agencies may issue stricter or more specific instructions for other pollution sources, extreme heat, or an active emergency.
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