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.
Live Lexington AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Lexington and Georgetown, Nicholasville, Winchester, Versailles.
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.
Canairy watches the sensors around your home, your kids' school, and everywhere else you care about, and tells you in plain English when the air changes enough to matter.
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?
This page shows the current AQI for Lexington, calculated from PurpleAir sensors across Fayette County and updated continuously. The map below shows every live sensor, so you can check the reading closest to your own neighborhood.
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 AQI level is unhealthy?
Under the US EPA scale, AQI 0–50 is Good and 51–100 is Moderate. From 101 the air is Unhealthy for Sensitive Groups — kids, older adults, and people with asthma or heart conditions — and above 150 it's Unhealthy for everyone. Canairy translates these numbers into a plain-English verdict, like whether to close the windows or move a workout indoors.
Where does Canairy's Lexington data come from?
Readings come from PurpleAir's network of laser particle sensors across Lexington and surrounding Bluegrass towns, cross-referenced with government monitors and the Google Air Quality API. You can see every sensor behind your numbers on the live map — there's no black box.
Is Canairy free?
Yes. The Canairy app is free to download and includes live air quality for all your saved places, plain-English verdicts, and free push alerts when the air crosses your threshold. A paid plan adds extras like SMS text alerts.
Get Canairy free on Google Play.