Air Quality in Fort Smith, Arkansas — Live
Live readings from PurpleAir sensors across Fort Smith — with free alerts the moment summer ozone or drifting smoke pushes the air past your threshold.
AQI 16 from 1 PurpleAir sensor · Trending up · data from PurpleAir
As of , the air quality in Fort Smith, Arkansas is AQI 16 — Good and rising — with PM2.5 at 2.9 µg/m³, from 1 live PurpleAir sensor. Canairy's verdict: Breathe easy.
For scale, that PM2.5 reading is below the World Health Organization's 24-hour guideline of 15 µg/m³. The WHO figure is a daily average and this is a live reading, so read it as a sense of magnitude rather than a formal exceedance — a brief spike and a bad day are not the same thing. More on the WHO guidelines
Pollen today in Fort Smith: weeds pollen is the strongest of the three at a high level, from Google's pollen forecast. Canairy shows the tree, grass and weed forecast beside the air reading on every plan, including the free one.
Free to download · Live data from PurpleAir & public monitors
Live PurpleAir sensor map for Fort Smith and Van Buren, Barling, Greenwood, Alma. Every dot is a real sensor, color-coded by current air quality.
Fort Smith's air is good most of the year, and by several measures it's one of the better records in Arkansas — a river-valley setting with steady wind and a lighter industrial footprint than the state's bigger metros helps keep it that way. The exception is summer: weeks of 90-plus-degree heat plus the usual Arkansas River Valley humidity are exactly the ingredients that turn sunlight and vehicle exhaust into ground-level ozone, and the same valley that usually clears out can hold that ozone in place when a high-pressure system sits overhead for days.
What Canairy does for Fort Smith
A clear verdict
Not just a number — a plain-English call for Fort Smith: open the windows, or keep them shut.
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A heads-up before it's bad
Trend alerts catch the air turning, so you can close up the house before the smoke settles in.
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Fort Smith sits in a valley, not a smog basin
The city sits at the confluence of the Arkansas and Poteau Rivers, at an elevation of about 463 feet, in the Arkansas River Valley between the Ozark Mountains to the north and the Ouachitas to the south. It's a real valley, but a wide, working one rather than the tight, wind-blocked basin that traps pollution in places like the Los Angeles or Napa valleys — Fort Smith gets enough steady wind moving through the corridor most days to carry pollutants out rather than letting them build up.
That geography, combined with wide streets and comparatively low traffic congestion for a metro its size, is a big part of why one recent comparison of Arkansas cities ranked Fort Smith's typical air quality second-best in the state, behind only Bella Vista and ahead of Little Rock and the booming Bentonville-Rogers corridor. It's not pristine mountain air, but it's a genuinely decent baseline most of the year.
Summer heat is what actually moves the needle
Fort Smith's climate runs hot: an average of roughly 78 days a year top 90°F, and about 11 days a year cross 100°F, with a long, humid Southern summer stretching from June into September. That combination of intense sun and heat is the classic recipe for ground-level ozone, which forms when vehicle and industrial exhaust cooks in strong sunlight rather than being emitted directly. It's a summertime problem here, not a wintertime one.
The Arkansas Department of Environmental Quality maintains an ambient air monitor for the Fort Smith metro area specifically to track this, and the same valley setting that clears the air on a windy day works against it on a stagnant one — when a high-pressure system parks over the region for a stretch of still, hot days, that's when ozone readings climb closest to the level that matters for people with asthma or heart conditions.
A trucking and manufacturing town, not a refinery town
Fort Smith is a logistics and manufacturing hub more than an industrial one. ArcBest — the parent of ABF Freight, one of the country's largest less-than-truckload carriers — was founded here in 1966 and still runs its headquarters campus on the east side of the city, with I-40 and I-540 carrying a steady stream of freight traffic through the metro. OK Foods, a major poultry processor, is also headquartered in Fort Smith, and the city's manufacturing base includes Rheem, Trane, Georgia-Pacific, Mars Petcare, and International Paper.
None of that adds up to the kind of refinery or heavy-industry pollution that dominates the story in some other cities, but it is a real, local source of everyday NOx and fine particles from truck traffic and manufacturing that a purely rural stretch of the Arkansas River Valley wouldn't have. And Fort Smith isn't entirely walled off from wildfire smoke either — in late July 2026, smoke from Canadian wildfires drifted far enough south to prompt air-quality advisories across parts of Arkansas, a reminder that even a city with no fire season of its own can still get a smoky day when the wind lines up right.
Fort Smith air quality FAQ
What is the air quality in Fort Smith right now?
As of September 14, 2026 at 7:08 AM CDT, the air quality in Fort Smith, Arkansas is AQI 16 — Good — with PM2.5 at 2.9 µg/m³, the median of 1 live PurpleAir sensor. Open the windows. Great for outdoor activity.
Why does Fort Smith's air quality get worse in summer?
Fort Smith averages around 78 days a year above 90°F, and that heat combined with strong sunlight is what drives ground-level ozone, which forms when vehicle and industrial exhaust reacts chemically in the heat rather than being emitted directly. On stagnant, high-pressure summer days the Arkansas River Valley's usual wind can drop off, letting ozone build up instead of clearing out — which is why the Arkansas Department of Environmental Quality runs a monitor specifically for the Fort Smith metro area.
Does wildfire smoke ever reach Fort Smith?
It's not a defining part of Fort Smith's air the way it is in the Western US, but it does happen. In late July 2026, smoke from Canadian wildfires drifted far enough south to trigger air-quality advisories across parts of Arkansas. Those events are usually brief and diluted by the distance the smoke travels, but Canairy's alerts will catch one if it pushes your local reading past your threshold.
What the AQI numbers mean
| AQI | Category | What it means for you |
|---|---|---|
| 0–50 | Good | Open the windows. Great for outdoor activity. |
| 51–100 | Moderate | Sensitive groups may want to take it slower outside. |
| 101–150 | Unhealthy for Sensitive Groups | Kids, elderly, and respiratory conditions stay closer to home. |
| 151–200 | Unhealthy | Skip outdoor exercise. Close windows. |
| 201–300 | Very Unhealthy | Limit time outside. N95 if you must go. |
| 301+ | Hazardous | Health emergency. Stay inside, run filtration if you have it. |
Canairy lets you tighten these bands if you’re more sensitive than the EPA default, so an alert can fire before the official category changes. How to read the Air Quality Index
Where these readings come from
The AQI at the top of this page is the median of the 1 curated PurpleAir sensor Canairy tracks in and around Fort Smith, with outliers set aside so that one sensor brought indoors — or parked beside a barbecue — cannot set the number for a whole city. Every sensor behind it is listed above with its distance and bearing from the city center. There is no black box here.
In the app, a place you save resolves the same way first. When no neighborhood sensor is reporting it falls back to the nearest EPA AirNow monitor, and anything modeled rather than measured is labelled a regional estimate rather than passed off as a sensor reading. How low-cost sensors compare to regulatory monitors
About Canairy
Canairy is free to download. The free plan covers one saved place with live readings, a plain-English verdict, and push alerts when the air crosses a threshold you choose. Paid plans add more places, faster refreshes, and SMS alerts. It is built by two parents in Sonoma County, California, who got tired of guessing whether it was safe to send the kids outside. Why we built it
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Air quality near Fort Smith
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