Air Quality in South Bend, Indiana — Live
Live readings from PurpleAir sensors across South Bend and the Michiana region — with free alerts when the air changes.
AQI 42 from 1 PurpleAir sensor · Trending up · data from PurpleAir
As of , the air quality in South Bend, Indiana is AQI 42 — Good and rising — with PM2.5 at 7.6 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
Pollen today in South Bend: 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 South Bend and Mishawaka, Elkhart, Granger, Niles, MI. Every dot is a real sensor, color-coded by current air quality.
Most of the year, South Bend's air is unremarkable in the best sense — this is a city that actually fixed a documented ozone problem rather than just talking about one. St. Joseph County was formally out of compliance with the federal ozone standard through the 1990s and early 2000s; it isn't anymore, though hot, still summer afternoons are still the stretch worth watching, and every few years smoke from Canadian wildfires drifts a thousand miles south and pushes the air here into unhealthy territory for a few days.
What Canairy does for South Bend
A clear verdict
Not just a number — a plain-English call for South Bend: 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 South Bend or across the country, on one screen.
South Bend used to fail the ozone test — now it doesn't
For nearly a decade, St. Joseph County was formally out of compliance with the federal government's health standard for ground-level ozone. The EPA designated the South Bend-Elkhart area nonattainment under the 1997 8-hour ozone standard, meaning summer smog here crossed the line the Clean Air Act draws for lung-damage risk often enough to matter. The cause was the standard Midwest recipe: vehicle and industrial emissions cooking into ozone during long, hot, humid summer afternoons with little wind to clear them out.
The cleanup worked. On July 19, 2007, EPA formally redesignated St. Joseph and Elkhart counties to attainment, and the area has stayed in compliance long enough that the 1997 standard itself has since been revoked here as no longer necessary. That's real progress, not a marketing line — but it's also why summer, not winter, is still the season to keep an eye on. Ozone still forms on hot, sunny, windless afternoons, and Indiana's IDEM still calls statewide Air Quality Action Days on the worst of them.
Wildfire smoke can still drift in from hundreds of miles away
South Bend has no fire season of its own, but it isn't immune to someone else's. In June 2023, smoke from Canadian wildfires rode north-to-northeast winds south into the Midwest and settled over what locals call Michiana — the South Bend, Mishawaka, and Elkhart area straddling the Indiana-Michigan line. IDEM issued Air Quality Action Days across the entire state, and local coverage reported the air stayed in the unhealthy range here for days before winds finally cleared it.
That event, and the smaller repeats since, are the reminder that a fire burning in Quebec or Ontario can still push South Bend's air into a range where kids, older adults, and anyone with asthma should stay inside — even under a clear blue sky with no smell of smoke at all. It's exactly the kind of shift a once-a-day forecast can miss and a live nearby sensor catches within the hour.
South Bend is building its own hyperlocal sensor network
The city itself has been unusually proactive about filling the local data gap. Its SenseSB program, run jointly by the Department of Innovation and Technology and the Office of Sustainability, has deployed 22 environmental monitors around town that track ambient air temperature and pollutants block by block instead of relying on one regional monitor miles away.
In 2023, University of Notre Dame researchers Ming Hu, Jason Carley, and Siavash Ghorbany took that further, mounting custom weatherproof sensors on the city's garbage trucks so their fixed weekly routes could map heat and air conditions neighborhood by neighborhood, with plans to extend the same trucks to air-quality readings. Canairy runs on the same instinct at a different scale: read the dense network of nearby sensors instead of a single number for the whole city, because South Bend's own research keeps confirming that conditions vary street to street, not just county to county.
South Bend air quality FAQ
What is the air quality in South Bend right now?
As of September 14, 2026 at 8:09 AM EDT, the air quality in South Bend, Indiana is AQI 42 — Good — with PM2.5 at 7.6 µg/m³, the median of 1 live PurpleAir sensor. Open the windows. Great for outdoor activity.
Did South Bend used to have an ozone problem?
Yes. St. Joseph County was designated nonattainment for ground-level ozone under the EPA's 1997 8-hour standard, mainly due to summer vehicle and industrial emissions. EPA redesignated the area to attainment on July 19, 2007, and it has stayed in compliance since — though hot, still summer afternoons are still when Indiana's IDEM is most likely to call an Air Quality Action Day here.
Does wildfire smoke reach South Bend?
It can, even though South Bend has no fire season of its own. In June 2023, smoke from Canadian wildfires drifted south on north-to-northeast winds and pushed AQI into the unhealthy range across the Michiana region for several days, prompting a statewide Air Quality Action Day from IDEM. It's an occasional event, not an annual one, but it's real and worth watching for.
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 South Bend, 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 South Bend
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