Air Quality in Bangor, Maine — Live
Live readings from PurpleAir sensors across Bangor — with free alerts if wildfire smoke or wood smoke moves in.
AQI 32 from 1 PurpleAir sensor · Trending down · data from PurpleAir
As of , the air quality in Bangor, Maine is AQI 32 — Good and falling — with PM2.5 at 5.7 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 Bangor: weeds pollen is the strongest of the three at a very low 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 Bangor and Brewer, Hampden, Orono, Old Town. Every dot is a real sensor, color-coded by current air quality.
Bangor's air is about as clean as it gets in America. Penobscot County is the only metro area in the country to land on all three of the American Lung Association's 2026 "State of the Air" Cleanest Cities lists — for ozone, for short-term particle pollution, and for year-round particle pollution — with straight A grades and effectively zero unhealthy air days most years. The exceptions are real but occasional: wood smoke settling into neighborhoods on cold, still winter nights, and the rare summer when Canadian wildfire smoke drifts far enough south to reach the Penobscot valley.
What Canairy does for Bangor
A clear verdict
Not just a number — a plain-English call for Bangor: 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 Bangor or across the country, on one screen.
Bangor is the only US metro on every Cleanest Cities list
In the American Lung Association's 2026 State of the Air report, the Bangor metro area — Penobscot County — was the only metro area in the entire country to make all three of the group's Cleanest Cities rankings: cleanest for ozone (its ninth straight year with a perfect grade), cleanest for short-term particle pollution (its seventeenth straight year), and among the ten cleanest nationally for year-round particle pollution. Both the ozone and short-term particle grades came back a straight A, with zero high-pollution days over the report's 2022-2024 monitoring window.
That is not a fluke of one good year. The same report gives Maine's other population centers a much rougher grade: the Portland-Lewiston-South Portland metro and Cumberland and York Counties all scored a C for ozone, and Cumberland County posted the worst year-round particle pollution grade in the state. Bangor sharing a state with cities that grade out that differently is itself the local story — the air here is not generically "New England air," it is specifically some of the best-monitored, cleanest air of any American city its size.
Why the coast struggles with ozone and Bangor mostly doesn't
Maine's own Department of Environmental Protection explains the coastal problem plainly: ozone and the pollutants that form it get carried out of the New York and Boston corridor, ride a cooling sea breeze onto the Gulf of Maine, and turn back toward shore, concentrating in a shallow layer right along the coastline and in the river valleys that drain to it. Peak ozone timing then rolls eastward through the afternoon and evening as that breeze pushes up the coast toward Mount Desert Island.
Bangor sits about 30 miles inland, up the tidal reach of the Penobscot River, away from that shoreline conveyor belt. Maine DEP's own material notes that inland vegetation scrubs ozone out of the air as it moves away from the coast, and Bangor's smaller traffic and industrial base than the southern Maine cities gives it less to add locally in the first place. That combination of distance from the transport corridor and modest local emissions is the practical reason a straight-A city and a string of C-grade counties can sit in the same state.
The two ways a clean-air city still gets a bad day
Maine is the second-most wood-heated state in the country — about 8.8% of homes use wood as their primary heat source, behind only Vermont's 12.5% — and that's a familiar sight in Bangor, across the river in Brewer, and in the rural towns around Penobscot County. On a cold, calm January or February night, smoke from stoves and fireplaces settles low over a neighborhood in a way the county's official monitor, built to track the broader average, doesn't fully capture at the block level.
The other exception showed up in 2023. That June, rain shielded most of Maine while smoke from Quebec fires gave southern New England some of the worst air quality it has seen in recorded history — Bangor mostly caught a break. By September, a denser plume from wildfires burning in Alberta reached Maine anyway, and the DEP issued an air-quality alert specifically for Northern Maine as particle pollution climbed into the Unhealthy for Sensitive Groups range. It doesn't happen most years, but a city with this good a track record is exactly the kind of place where nobody has a habit of checking — until the one week they need to.
Bangor air quality FAQ
What is the air quality in Bangor right now?
As of September 14, 2026 at 8:08 AM EDT, the air quality in Bangor, Maine is AQI 32 — Good — with PM2.5 at 5.7 µg/m³, the median of 1 live PurpleAir sensor. Open the windows. Great for outdoor activity.
Why does Bangor have some of the cleanest air in the country?
In the American Lung Association's 2026 State of the Air report, the Bangor metro area (Penobscot County) was the only metro area in the nation to earn a spot on all three Cleanest Cities lists — ozone, short-term particle pollution, and year-round particle pollution — with straight A grades. Sitting roughly 30 miles inland up the Penobscot River keeps Bangor away from the sea-breeze corridor that concentrates ozone transported up the coast from Boston and New York, which is part of why coastal Maine cities like Portland grade out worse.
Does Canadian wildfire smoke ever reach Bangor?
Yes, though it's rare. In June 2023, rain shielded most of Maine while a Quebec smoke plume gave southern New England some of its worst air quality on record. By September 2023 a denser plume from fires burning in Alberta reached Maine, and the DEP issued an air-quality alert for Northern Maine as particle pollution climbed into the Unhealthy for Sensitive Groups range. It doesn't happen every summer, but when it does, it's worth checking your number instead of guessing from the color of the sky.
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 Bangor, 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 Bangor
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