Air Quality in Aurora, Illinois — Live
Live readings from PurpleAir sensors across Aurora — with free alerts when summer ozone or wildfire smoke pushes the air into unhealthy territory.
AQI 29 from 3 PurpleAir sensors · Trending down · data from PurpleAir
As of , the air quality in Aurora, Illinois is AQI 29 — Good and falling — with PM2.5 at 5.2 µg/m³, the median of 3 live PurpleAir sensors reading 24 to 32. 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 Aurora: weeds pollen is the strongest of the three at a very 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 Aurora and North Aurora, Montgomery, Oswego, Naperville. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Aurora
The sensors Canairy reads in Aurora agree right now — all 3 sit in the Good band, a 8-point spread — so the city-wide number is a fair description of the whole area today.
| From city center | AQI | Category |
|---|---|---|
| 3.6 mi SE | 29 | Good |
| 6.0 mi SW | 32 | Good |
| 6.9 mi E | 24 | Good |
Aurora's air is unremarkable most of the year — this stretch of the Fox River Valley doesn't sit in a smoke corridor or an industrial basin the way some cities do. The real pattern here is summer ozone: Aurora sits inside the Chicago metro area that the EPA reclassified to "Serious" nonattainment for ozone in January 2025, which means hot, sunny, high-traffic days between May and September are the days worth watching, not winter.
On top of that, Aurora has twice in recent years watched Canadian wildfire smoke drift down from the north and blanket the whole region for days at a time.
What Canairy does for Aurora
A clear verdict
Not just a number — a plain-English call for Aurora: 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 Aurora or across the country, on one screen.
Aurora is part of Chicago's "Serious" ozone nonattainment area
In December 2024 the EPA finalized a rule finding that the Chicago-Naperville area — Cook, DuPage, Kane, Lake, McHenry, and Will counties, plus parts of Grundy and Kendall — had failed to meet the 2015 ozone health standard by its deadline. The reclassification from Moderate to Serious nonattainment took effect January 16, 2025, and Kane County, where Aurora is the county seat, sits squarely inside that boundary.
Ozone isn't smoke — it forms when tailpipe and industrial emissions cook in sunlight and heat, which is why the worst days in Aurora tend to be still, sunny, 85-plus-degree afternoons in June, July, and August rather than any particular wind direction. The Illinois EPA calls these Air Pollution Action Days, and the whole Chicago metro area, Aurora included, gets flagged together whenever the forecast crosses into Unhealthy for Sensitive Groups territory.
Canadian wildfire smoke has reached Aurora too
Aurora doesn't have its own fire season, but it isn't immune to other regions' fires either. On June 27, 2023, Chicago briefly had the worst air quality of any major city in the world as smoke from wildfires in Quebec settled over the region, and the Illinois EPA's alert that day named Kane County specifically alongside Cook, DuPage, and Will.
It happened again in August 2025, when a statewide Air Pollution Action Day driven by Canadian wildfire smoke and ozone stretched for nearly a week across Cook, DuPage, and the surrounding counties. Neither event had anything to do with a local fire — the smoke traveled hundreds of miles — which is exactly why a single citywide number from a distant monitor isn't enough; the sensor nearest your house is what actually tells you what you're breathing.
What to actually do on an ozone or smoke day in Aurora
Ozone peaks in the afternoon and early evening, so if you're planning a run along the Fox River Trail or an afternoon at RiverEdge Park, checking the number before you go — not after your eyes start to sting — is what actually helps. Moving a workout to the morning, before ozone has had time to build up in the heat, is one of the simplest fixes on a flagged day.
Canairy exists for exactly this: set a threshold once for your house, your kid's school, or your parents' place across town, and we'll tell you the moment the air crosses it — whether that's a summer ozone spike over the Fox River Valley or smoke drifting down from a fire a thousand miles away.
Aurora air quality FAQ
What is the air quality in Aurora right now?
As of September 14, 2026 at 7:10 AM CDT, the air quality in Aurora, Illinois is AQI 29 — Good — with PM2.5 at 5.2 µg/m³, the median of 3 live PurpleAir sensors. Open the windows. Great for outdoor activity.
Why does Aurora get ozone alerts in the summer?
Aurora sits inside the Chicago-Naperville area, which the EPA reclassified to "Serious" nonattainment for ozone in January 2025 after the region missed its 2015 ozone standard deadline. Ground-level ozone forms when vehicle and industrial emissions react with sunlight and heat, so hot, sunny, high-traffic days from May through September are when Aurora's air is most likely to cross into Unhealthy for Sensitive Groups territory.
Does Canadian wildfire smoke reach Aurora?
Yes. On June 27, 2023, Chicago and its suburbs — including Kane County, where Aurora sits — had some of the worst air quality of any major metro area in the world because of smoke from wildfires in Quebec, and a similar statewide Air Pollution Action Day driven by Canadian wildfire smoke hit the region again in August 2025. Neither fire was anywhere near Illinois; the smoke traveled hundreds of miles on upper-level winds.
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 3 curated PurpleAir sensors Canairy tracks in and around Aurora, 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
Go deeper
Air quality near Aurora
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