Air Quality in Rockford, Illinois — Live
Live readings from PurpleAir sensors across Rockford — with free alerts the moment Canadian wildfire smoke drifts in.
AQI 52 from 2 PurpleAir sensors · Trending up · data from PurpleAir
As of , the air quality in Rockford, Illinois is AQI 52 — Moderate and rising — with PM2.5 at 9.5 µg/m³, the median of 2 live PurpleAir sensors reading 44 to 55. Canairy's verdict: Mostly clear.
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 Rockford: 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 Rockford and Loves Park, Machesney Park, Belvidere, Roscoe. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Rockford
The sensors Canairy reads in Rockford are 11 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 |
|---|---|---|
| 2.0 mi NE | 55 | Moderate |
| 6.8 mi NE | 44 | Good |
Most of the year, Rockford's air is genuinely clean — flat, wind-swept northern Illinois doesn't trap pollution the way a mountain valley does, and on an ordinary day the PM2.5 count here is low. The exception is summer, when smoke from wildfires burning hundreds or even a thousand miles away in Canada rides south on the jet stream and settles over the whole Rock River Valley for days at a time, turning a clear morning into a hazy, unhealthy afternoon with no fire anywhere near the stateline.
What Canairy does for Rockford
A clear verdict
Not just a number — a plain-English call for Rockford: 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 Rockford or across the country, on one screen.
What the air in Rockford is doing next
| When | Expected air quality | Main pollutant |
|---|---|---|
| Today | Good | ozone |
| Tomorrow | Good | ozone |
Forecast from EPA AirNow for the Rockford reporting area. Canairy watches the live sensors against it and tells you when the air actually crosses your threshold, rather than leaving you to check.
Rockford's worst air days come from fires a thousand miles away
On July 17, 2026, air quality across the Rockford area fell to hazardous levels as a thick plume of Canadian wildfire smoke pushed south overnight. The Rockford Park District closed every outdoor pool that Friday, along with the Highland, Keye Mallquist, and Wantz facilities; the YMCA of Rock River Valley cancelled its outdoor swim lessons; Mercyhealth Sportscore Two called off evening outdoor programs; and the Rockford City Market shut down for the week. An air quality alert covering northern Illinois had already been in effect since earlier that week as the smoke plume thickened.
It wasn't a one-off. Rockford and the rest of northern Illinois lived through the same pattern in June 2023, when smoke from record-setting Quebec wildfires turned Midwest skies orange and pushed AQI readings into the hundreds as far south as Chicago. Neither event involved a fire anywhere near Illinois — both were entirely imported smoke, which is exactly why a citywide AQI number matters here: nothing about the local weather or the calendar tells you it's coming until the plume is already overhead.
Why the smoke clears here faster than it does out West
Rockford sits on a flat glacial till plain along the Rock River, with no surrounding mountains or ridgeline to pen pollution in. That geography is a genuine advantage: on a normal day, steady winds off the plains move air through the region quickly, which is a big part of why Rockford's baseline air quality reads as good almost year-round rather than chronically hazy.
The tradeoff is that when a smoke plume is thick enough and the upper-level winds line up right, that same open terrain does nothing to stop it — the smoke simply rides through at whatever altitude the jet stream carries it, sometimes staying aloft and merely dimming the sun, other times mixing down to ground level and pushing the AQI into the unhealthy range for a day or two before the next weather system pushes it out.
Local industry plays a smaller role than the highway and the weather
Rockford grew up as a manufacturing town — it was long nicknamed the 'Screw Capital of the World' for its fastener plants, and aerospace and automotive-parts suppliers like Woodward and Collins Aerospace remain major employers today. Modern emissions controls mean day-to-day industrial output isn't the driver of bad air days here the way it can be in cities with active refineries or uncontrolled plants; Winnebago County isn't listed in EPA's ozone nonattainment areas, unlike the Chicago suburbs to the east.
The Stellantis assembly plant in nearby Belvidere, which built Jeep Cherokees for decades, sat idled through 2023–2026 and isn't a current emissions source; it's slated to restart production in 2027. The more constant local factor is traffic on the I-90/I-39 interchange that runs through the metro area, which contributes routine vehicle exhaust but nothing close to the scale of the summer smoke events.
Rockford air quality FAQ
What is the air quality in Rockford right now?
As of September 15, 2026 at 7:10 AM CDT, the air quality in Rockford, Illinois is AQI 52 — Moderate — with PM2.5 at 9.5 µg/m³, the median of 2 live PurpleAir sensors. Sensitive groups may want to take it slower outside.
Why did Rockford's air quality get so bad in July 2026?
A thick plume of Canadian wildfire smoke drifted south over northern Illinois, pushing AQI into the hazardous range on July 17, 2026 and prompting the Rockford Park District to close every outdoor pool, cancel the YMCA of Rock River Valley's outdoor swim lessons, and shut down the Rockford City Market for the week. No fire was burning anywhere near Illinois — the smoke had traveled hundreds of miles on the jet stream, the same pattern that turned Midwest skies orange during the record Quebec fires of June 2023.
Does Rockford get wildfire smoke every summer?
Not every summer, but it's now a recurring risk rather than a freak event. Rockford saw major smoke-driven air quality alerts in both June 2023 and July 2026, in each case from Canadian wildfires burning hundreds of miles away. Because the smoke arrives from so far off, there's little local warning beyond checking the forecast and the current reading.
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 2 curated PurpleAir sensors Canairy tracks in and around Rockford, 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 Rockford
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