Kids, Schools, and AQI: A Parent's Wildfire Smoke Guide
Last updated 2026-07-15
Children are not small adults when it comes to wildfire smoke. Pound for pound they breathe more air, their lungs and airways are still developing into the late teens, and they spend far more time running around outdoors than most grown-ups. That combination means a smoky day that feels merely annoying to you can hit a child harder.
This guide explains why kids are more exposed, the AQI thresholds most US schools actually use for recess and sports, the specific questions worth asking your school, and how to build cleaner air at home. Before any outdoor plan, check the local number on Can I Go Outside?
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Why children are more vulnerable
Three biological facts stack up against kids during smoke events. Wildfire smoke is dominated by PM2.5 — fine particles small enough to travel deep into the lungs and cross into the bloodstream — so these differences matter.
- More air per body weight. A child's higher breathing rate relative to body size means more particles reach their lungs for the same time outdoors.
- Developing lungs. Airways and lung tissue keep maturing through adolescence, and heavy pollution exposure during these years can affect long-term lung growth.
- More outdoor time. Recess, PE, sports practice, and walking to school all raise exposure exactly when kids are breathing hardest.
- Less self-reporting. Young children may not recognize or mention a cough, chest tightness, or fatigue until it is pronounced.
Children with asthma are a special case — smoke is a powerful trigger, and a bad-air week can mean more rescue-inhaler use and missed school.
The AQI thresholds schools use
Most US school and youth-sports guidance leans on the color-coded EPA Air Quality Index. There is no single national law, but district and state athletic-association playbooks tend to cluster around two cutoffs:
- AQI 101–150 (Unhealthy for Sensitive Groups, orange). This is where many schools first act: shorten or lighten outdoor activity, add breaks, and keep sensitive-group students — especially kids with asthma — indoors. AQI 101 is the common first trigger.
- AQI 151–200 (Unhealthy, red). Many districts move recess and PE indoors entirely and cancel or relocate outdoor practices and games. AQI 151 is the common shut-down-outdoor-activity trigger.
- AQI 201+ (Very Unhealthy and above). Outdoor activity is off, and some districts consider closures or remote learning.
Thresholds vary by district, so confirm the exact numbers your school follows rather than assuming.
What to ask your school
You do not need to be confrontational to get useful answers. A short email to the principal or athletic director covers most of it:
- What AQI source and thresholds trigger moving recess, PE, and practices indoors?
- How and when are families notified — and can I flag my child as sensitive-group (asthma, heart or lung condition)?
- Do classrooms and the gym have portable air cleaners or upgraded HVAC filtration for smoke days?
- What is the plan for outdoor sports — reschedule, relocate, or shorten — and who makes the call?
- Are staff trained to recognize breathing distress and to let kids reduce exertion?
If your district has no written policy, ask them to adopt one; EPA and many state health departments publish ready-made school smoke guidance.
Cleaner air at home and in the classroom
You control the air kids breathe for the many hours they are home. On smoky days, keep windows and doors shut, run recirculate on the AC, and set up at least one clean-air room — usually a bedroom — where a child sleeps and does homework.
- Size a portable purifier to the room with the Purifier Sizer, or build a low-cost box-fan filter with the CR Box Builder.
- A small indoor air monitor lets you verify the clean room is actually clean rather than guessing from the outdoor number.
- Skip anything that adds particles indoors on smoke days: no candles, incense, frying, or vacuuming without a HEPA bag.
- For older kids who must be outside, a well-fitting N95 helps, but small children rarely get a good seal — keeping them indoors is the more reliable protection.
For how AQI maps to PM2.5 numbers on this site, see our methodology.
Signs to watch and when to act
Watch for coughing, wheezing, chest tightness, unusual fatigue, or a child who says it is hard to breathe. Any child with asthma should have their action plan and rescue inhaler current before fire season.
Seek prompt medical care for fast or labored breathing, persistent wheezing, bluish lips, or a child too breathless to speak or play. When in doubt during a smoke event, keep kids indoors and reduce exertion — the downside of an extra quiet afternoon is small.
FAQ
At what AQI should my kid stay in for recess?
Many schools keep sensitive-group children in starting at AQI 101 (Unhealthy for Sensitive Groups) and move all outdoor activity indoors around AQI 151 (Unhealthy). Thresholds vary by district, so confirm your school's exact policy.
Are children considered a sensitive group for air quality?
Yes. EPA lists children and teens among sensitive groups, along with people with heart or lung disease, older adults, and pregnant people. Kids breathe more air for their size and have still-developing lungs.
Should my child wear an N95 to school on smoky days?
An N95 can help older children who tolerate a snug fit, but young kids rarely get a proper seal, which limits protection. Keeping children indoors with clean air is usually the more dependable option.
How do I know the air inside is actually cleaner?
Outdoor AQI does not tell you indoor levels. A low-cost indoor air monitor reading PM2.5 confirms whether your clean room, purifier, or box-fan filter is doing its job.
My child has asthma. What should I do before fire season?
Refill and check the expiration on rescue and controller inhalers, update the written asthma action plan, share sensitive-group status with the school, and set up a clean-air bedroom at home.
Check the air where you are
Live AQI on the 2024 EPA standard, with the reporting monitor and observation time on every reading.
Where this guidance comes from
We paraphrase published guidance rather than inventing our own. The primary sources for everything on this page:
- AirNow — Air Quality and Health (U.S. EPA): the AQI scale and its activity guidance by level.
- EPA — Particulate Matter (PM) Basics: what PM2.5 is and why it reaches deep into the lungs.
- CDC — Wildfire Smoke Safety: who is at higher risk, and when to seek care.
- EPA — Wildfires and Indoor Air Quality: clean rooms, filtration and what actually works indoors.
- AHAM: the CADR standard and the two-thirds room-sizing rule.
Our own AQI arithmetic is documented on the methodology page.
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Some links are affiliate links — see disclosure. This guide is general health information and is not a substitute for medical advice — see disclaimer.