Air Quality in Lexington, Kentucky — Live
Live readings from PurpleAir sensors across Lexington — with free alerts the moment ozone or smoke pushes the air quality down.
AQI 21 from 1 PurpleAir sensor · Holding steady · data from PurpleAir
As of , the air quality in Lexington, Kentucky is AQI 21 — Good and holding steady — with PM2.5 at 3.8 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
Free to download · Live data from PurpleAir & public monitors
Live PurpleAir sensor map for Lexington and Georgetown, Nicholasville, Winchester, Versailles. Every dot is a real sensor, color-coded by current air quality.
For most of the year, the air over Lexington and the rest of the Bluegrass region is genuinely good — this is horse-farm country, not refinery country, and PM2.5 levels are unremarkable by national standards. The exceptions are predictable: hot, still summer afternoons that cook up ground-level ozone into Lexington-Fayette County's own Ozone Action Days, and the rare summer when wildfire smoke drifts in from far outside Kentucky, as it did in June 2023 when Canadian wildfire smoke pushed the AQI to 163 and the state issued a multi-day air quality alert.
What Canairy does for Lexington
A clear verdict
Not just a number — a plain-English call for Lexington: open the windows, or keep them shut.
Smoke alerts
A push or text the moment the air crosses your threshold — and again when it clears.
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.
Every place you care about
Home, work, the kids' school — across Lexington or across the country, on one screen.
Lexington calls its own Ozone Action Days
Lexington-Fayette County had already declared six Ozone Action Days by late September 2025, each one issued the day before forecasters expected the air to slip into the Unhealthy for Sensitive Groups range — Code Orange on the standard air quality color scale. The trigger is almost always the same: a hot, sunny, windless stretch that lets vehicle and industrial emissions cook into ground-level ozone faster than it can mix away.
On an action day, the standard advice is to drive less, combine errands, delay mowing the lawn or refueling the car until evening, and skip the midday outdoor workout if you're in a sensitive group. Lexington's urban core has sat inside a growth boundary that has contained development since 1958, and a lot of the metro's daily traffic — including the stretch where I-64 and I-75 run concurrently right through the middle of the city — funnels through that comparatively compact area, which is part of why ozone builds up here rather than dispersing across sprawl.
The 2023 Canadian wildfire smoke reached the Bluegrass
Kentucky doesn't have a wildfire season the way California or Oregon does, which is exactly why June 28–30, 2023 stood out. Smoke from Canada's record wildfire season drifted more than a thousand miles south, and Lexington's AQI hit 163 early on June 28 — deep in the Unhealthy range. The Kentucky Energy and Environment Cabinet issued an air quality alert covering Lexington, Louisville, northern Kentucky, and Owensboro, and Kentucky ended up among the furthest-south states meaningfully affected by that plume.
The reading eased to 96 by midday on June 30 as the smoke moved on, but the episode was a reminder that Lexington's air isn't only shaped by what happens inside Fayette County. A fire season big enough, hundreds of miles north, can still put a haze over the horse farms — and because it's rare here, it's the kind of event a lot of people miss until their throat already feels it, rather than checking a sensor first.
Georgetown's Toyota plant is the region's biggest single industrial source
About fifteen miles north of Lexington in Georgetown, Scott County, Toyota Motor Manufacturing Kentucky runs one of the largest auto assembly plants in North America. EPA Toxics Release Inventory data show the plant reporting roughly 1.1 million pounds of releases across 25 chemicals, six of them carcinogens, with air releases as the primary pathway.
The trend, at least, is downward: TRI releases fell about 29 percent between 2019 and 2023 as the plant added pollution controls and a 30-acre solar field. On a north wind, some of that industrial signature can mix with everyday vehicle exhaust before it reaches Fayette County — rarely enough to dominate a summer's air quality on its own, but one more reason a citywide average can miss what's happening in the neighborhoods closest to the interstate or the county line.
Lexington air quality FAQ
What is the air quality in Lexington right now?
As of September 14, 2026 at 8:09 AM EDT, the air quality in Lexington, Kentucky is AQI 21 — Good — with PM2.5 at 3.8 µg/m³, the median of 1 live PurpleAir sensor. Open the windows. Great for outdoor activity.
Why did Lexington's air quality get so bad in June 2023?
Smoke from Canadian wildfires drifted more than a thousand miles south and settled over Kentucky from June 28 to June 30, 2023. Lexington's AQI hit 163 — deep into the Unhealthy range — early on June 28, and the state's Energy and Environment Cabinet issued an air quality alert covering Lexington, Louisville, northern Kentucky, and Owensboro. By midday on June 30 the reading had eased back to 96, but for three days the Bluegrass region breathed smoke from a fire season hundreds of miles away.
What is a Lexington Ozone Action Day?
On hot, sunny, windless days, vehicle and industrial emissions cook into ground-level ozone faster than it can disperse, and local officials call an Ozone Action Day when the forecast points toward the Unhealthy for Sensitive Groups range. Lexington-Fayette County had already logged six of them by late September in 2025. On those days it helps to drive less, delay mowing or refueling until evening, and check the air before an outdoor workout.
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 Lexington, 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 Lexington
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