Air Quality in Greensboro, North Carolina — Live
Live readings from PurpleAir sensors across Greensboro — with free alerts the moment summer ozone crosses the line.
AQI 49 from 4 PurpleAir sensors · Trending down · data from PurpleAir
As of , the air quality in Greensboro, North Carolina is AQI 49 — Good and falling — with PM2.5 at 8.9 µg/m³, the median of 4 live PurpleAir sensors reading 41 to 58. 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 Greensboro: 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 Greensboro and High Point, Jamestown, Kernersville, Oak Ridge. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Greensboro
The sensors Canairy reads in Greensboro are 17 AQI points apart right now, from Good to Moderate, which is the whole reason one city-wide number can mislead you: the median describes air you may not be standing in.
| From city center | AQI | Category |
|---|---|---|
| 1.2 mi NNE | 58 | Moderate |
| 3.1 mi SSE | 49 | Good |
| 3.4 mi SSE | 51 | Moderate |
| 3.8 mi E | 41 | Good |
Greensboro's air is in good shape most of the year — the rolling Piedmont doesn't trap smog the way a true valley does. The exception is summer: on hot, sunny, windless days from June through September, Greensboro sits inside exactly the kind of airshed that builds ground-level ozone, and the region has spent decades under federal nonattainment and maintenance status because of it.
What Canairy does for Greensboro
A clear verdict
Not just a number — a plain-English call for Greensboro: 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 Greensboro or across the country, on one screen.
Greensboro's real air problem is summer ozone, not smoke
Greensboro anchors one corner of the Greensboro-Winston-Salem-High Point 8-hour ozone area, a region the EPA once designated nonattainment and has since redesignated to maintenance status under the 1997 ozone standard — meaning the air met the federal bar, but regulators are still watching to make sure it stays that way. Ground-level ozone isn't smoke or soot; it forms when sunlight cooks vehicle and industrial exhaust, so the worst days show up in July and August heat, not winter.
The Forsyth County Office of Environmental Assistance and Protection forecasts ozone for the whole nine-county Triad airshed — Forsyth, Guilford, Alamance, Davidson, Randolph, Rockingham, Caswell, Davie, and Stokes — and calls a Code Orange Ozone Action Day when 90-degree heat, bright sun, and stagnant air are all lining up. Because ozone forms across that shared airshed rather than over one city alone, Greensboro, High Point, and Winston-Salem usually get the same alert on the same afternoon.
Even Greensboro got Canadian wildfire smoke in 2023
Wildfire smoke isn't the annual story here that it is in California, but it isn't unheard of either. In June 2023, smoke from Canadian wildfires burning more than a thousand miles away drifted down into central North Carolina and settled over the Triad at the same time as a summer heat-and-ozone alert — two separate problems stacking on top of each other instead of one replacing the other.
Local coverage at the time reported the Triad as the only region within hundreds of miles still under an active air-quality alert that week, even as the smoke moved on elsewhere. It was a reminder that Greensboro's air can turn for reasons that have nothing to do with anything happening in Guilford County — the sensors are what tell you it's happening, not the sky, which can look only mildly hazy while the particle count is genuinely unhealthy.
Three interstates and an airport, not a smoke-trapping valley
Greensboro sits in the rolling Piedmont at around 897 feet, drained by the Deep and Haw rivers, with no mountain ring or valley floor to hold pollution in place the way it does out West — most days, wind clears the air out completely. What the geography does concentrate is traffic: I-40, I-85, and I-73 all converge in the city, and Piedmont Triad International Airport, home to a FedEx cargo hub, adds its own steady stream of engine exhaust to the same air.
None of that shows up as visible smog most of the year. It matters on the handful of summer days when the wind dies down and the sun is strong enough to turn that exhaust into ozone faster than it can disperse — which is precisely the combination the Code Orange alerts are built to catch.
Greensboro air quality FAQ
What is the air quality in Greensboro right now?
As of September 14, 2026 at 10:29 AM EDT, the air quality in Greensboro, North Carolina is AQI 49 — Good — with PM2.5 at 8.9 µg/m³, the median of 4 live PurpleAir sensors. Open the windows. Great for outdoor activity.
Why does Greensboro get ozone alerts in the summer?
Greensboro sits inside the Greensboro-Winston-Salem-High Point ozone maintenance area, and on hot, sunny, stagnant days — typically July and August — sunlight cooks exhaust from the region's converging interstates and airport into ground-level ozone. The Forsyth County Office of Environmental Assistance and Protection calls a Code Orange Ozone Action Day for the whole nine-county Triad airshed when that mix is expected, which is why Greensboro, High Point, and Winston-Salem often get the same alert on the same afternoon.
Does wildfire smoke ever reach Greensboro?
It can, even without a fire anywhere nearby. In June 2023, smoke from Canadian wildfires drifted all the way into central North Carolina and stacked on top of a summer heat-and-ozone alert, and the Triad was reported as the only region within hundreds of miles under an active air-quality alert that week. It isn't an annual event the way it is out West, but it shows the air here isn't only about local traffic and heat.
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 4 curated PurpleAir sensors Canairy tracks in and around Greensboro, 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 Greensboro
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