US Air Quality

Outdoor Event Planning

Planning outdoor events based on air quality conditions.

QUICK ANSWER

What AQI is safe for outdoor events?

Outdoor events are safe to hold when the AQI is under 100. An AQI of 0–50 (Good) is ideal, and 51–100 (Moderate) is generally fine — offer sensitive attendees shade, seating, and a way to step inside. From 101–150 (Unhealthy for Sensitive Groups), provide indoor areas and advise vulnerable guests to limit exertion; above 150 (Unhealthy), consider postponing, shortening, or moving the event indoors, since crowds include children, older adults, and people with asthma who are most affected.

✓0–50 (Good): ideal conditions for any outdoor event.
✓51–100 (Moderate): generally fine; give sensitive attendees shade, seating, and an indoor option.
✓101–150 (Unhealthy for Sensitive Groups): offer indoor areas; advise vulnerable guests to limit exertion.
✓151+ (Unhealthy and above): consider postponing, shortening, or moving the event indoors.

Frequently asked questions

What AQI is safe for outdoor events?▾

AQI 0–50 (Good) is ideal for outdoor events, and 51–100 (Moderate) is generally safe — provide shade, seating, and an easy indoor option for sensitive attendees. From AQI 101–150 (Unhealthy for Sensitive Groups), make indoor areas available and advise children, older adults, and people with asthma or heart conditions to limit exertion. At AQI 151 and above (Unhealthy), consider postponing, shortening, or moving the event indoors.

Should an outdoor event be cancelled for poor air quality?▾

Below AQI 100 an event can generally proceed as planned. Between 101 and 150, keep it running but add indoor refuge space and reduce strenuous programming. Once the AQI reaches 151 (Unhealthy), seriously weigh postponing or relocating indoors, because event crowds always include vulnerable people. Build the decision into your plan ahead of time by setting AQI thresholds and checking the same-day forecast, especially during wildfire season when smoke can arrive quickly.

What is the best time of day to schedule an outdoor event for cleaner air?▾

Morning events typically see the best air quality, before traffic builds and before afternoon sun drives ground-level ozone formation. Evening is a good second option as ozone dissipates after sunset. Midday to late afternoon in summer is the riskiest window for ozone, so schedule intensive or long outdoor programming for the cooler parts of the day.

Protect Yourself Outdoors

Gear for exercising in poor air

At AQI 101, the air outside is already in the range where hard breathing pulls in more pollution. If you're heading outdoors anyway, two pieces of gear do more than anything indoors:

N95 / KN95 mask

Wear a mask when exercising in poor air — a snug N95/KN95 filters the PM2.5 and wildfire smoke that mouth-breathing drives deep into your lungs. (Masks do little against ozone, a gas.)

Shop N95 / KN95 Masks on Amazon →

Portable air-quality monitor

Check the air where you actually are — a pocket PM2.5 monitor reads your street, trail or field, which can be far worse (or better) than the nearest official station miles away.

Shop Portable AQ Monitors on Amazon →

As an Amazon Associate, we earn from qualifying purchases at no extra cost to you.

Air Quality Guidelines for Outdoor

When exercising or working outdoors, you breathe faster and deeper, potentially inhaling more air pollution. Knowing when it is safe to be active outdoors is crucial for your health.

When to Exercise/Work Outdoors

AQI 0-50 (Good): Safe for all activities
AQI 51-100 (Moderate): Generally safe, sensitive individuals take caution
AQI 101-150 (Unhealthy for Sensitive): Reduce intense activities
AQI 151+ (Unhealthy): Avoid prolonged outdoor exertion

Planning around poor air quality? Keep your indoor spaces clean too:

Our Pick

Protect Your Indoor Air

With an AQI of 101 driven by fine particulate matter (PM2.5), outdoor pollution is seeping indoors. A True-HEPA purifier captures up to 99.97% of the PM2.5, wildfire smoke and fine particles behind this reading. On unhealthy days like today, size up to a higher-CADR unit so it can clear the whole living area quickly.

Large Room4.6(8,000+ ratings)

Coway AP-1512HH Mighty

True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft

High CADR for unhealthy-AQI days — clears smoke & PM2.5 from large areas fast

~$230

Check Price on Amazon →

Compare top-rated True-HEPA purifiers:

Large Room

Coway AP-1512HH Mighty

HEPA + Carbon

True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft

~$2304.6

Check Price on Amazon →

Best Times of Day

Early morning typically has the best air quality before traffic builds up and ozone forms. Evening can also be good once ozone decreases after sunset.

Protection Tips

Check the AQI before heading outdoors
Choose routes away from busy roads when possible
Consider wearing an N95 mask on poor air quality days
Move activities indoors when AQI is elevated

Where outdoor event planning is hardest on your lungs right now

The five monitored US cities with the highest Air Quality Index in our latest EPA AirNow snapshot. If you are planning outdoor event planning in or near one of these, check the city page (and the live AirNow reading) before you go.

#	City	AQI	Category	Main pollutant	Observed
1	Little Rock, AR	96	Moderate	PM2.5	9:00 PM CDT on September 16, 2026
2	Visalia, CA	83	Moderate	PM10	7:00 PM PDT on September 16, 2026
3	Jackson, MS	75	Moderate	PM2.5	9:00 PM CDT on September 16, 2026
4	Bakersfield, CA	74	Moderate	O3	7:00 PM PDT on September 16, 2026
5	Charlotte, NC	73	Moderate	PM2.5	10:00 PM EDT on September 16, 2026

Source: EPA AirNow (files.airnowtech.org reportingarea.dat). This snapshot was taken when the site was last built (Sep 17, 2026, 3:03 AM UTC); AQI changes hourly, so treat this as a starting point, not a live reading. Covers 146 of 149 tracked cities.