Air Quality in Salem, Oregon — Live
Live readings from PurpleAir sensors across Salem — with free alerts the moment smoke moves in.
AQI 24 from 4 PurpleAir sensors · Trending down · data from PurpleAir
As of , the air quality in Salem, Oregon is AQI 24 — Good and falling — with PM2.5 at 4.3 µg/m³, the median of 4 live PurpleAir sensors reading 0 to 26. 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 Salem: weeds pollen is the strongest of the three at a 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 Salem and Keizer, Dallas, Silverton, Independence. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Salem
The sensors Canairy reads in Salem agree right now — all 4 sit in the Good band, a 26-point spread — so the city-wide number is a fair description of the whole area today.
| From city center | AQI | Category |
|---|---|---|
| City center | 26 | Good |
| 2.2 mi WSW | 0 | Good |
| 4.3 mi N | 24 | Good |
| 4.9 mi NNE | 24 | Good |
Salem sits on the floor of the mid-Willamette Valley, where the air is usually easy but turns on a few predictable things: wildfire smoke funneling down the Santiam Canyon from the Cascades, and winter inversions that trap wood smoke against the valley floor. In September 2020 the Beachie Creek Fire burned to the doorstep of towns just east of the city, and Salem's air went past the top of the scale.
What Canairy does for Salem
A clear verdict
Not just a number — a plain-English call for Salem: 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 Salem or across the country, on one screen.
September 2020: smoke from the Santiam Canyon put Salem past the top of the scale
The Beachie Creek Fire started as a lightning strike in the Cascades on August 16, 2020, then exploded on the night of September 7-8 when east winds over 50 mph drove it down the Santiam Canyon toward Salem. It merged with the Lionshead Fire, eventually burned more than 400,000 acres, and killed five people. Detroit was nearly destroyed on September 9, and Gates and Mill City burned as the fire pushed west; evacuation orders reached as far west as Salem near midnight on September 8.
For the city itself the damage was the smoke. In mid-September Salem's air quality index climbed above 500, past the point the EPA can measure, which it labels 'beyond index.' Portland, Salem and other Northwest cities briefly had some of the worst air in the world. It is the kind of event that makes it clear why a plain-English warning the night before matters more than a color on a map.
Winter inversions trap wood smoke on the valley floor
Salem's other regular air problem has nothing to do with fire. On calm, cold nights the Willamette Valley develops a temperature inversion: warm air settles over the cooler, denser air on the valley floor and acts like a lid, so nothing near the ground mixes upward. It is the same setup that locks winter fog into the valley for days at a time.
Under that lid, PM2.5 from residential wood stoves and fireplaces builds up instead of blowing away. Oregon's DEQ issues wintertime particulate advisories and local wood-burning restrictions for exactly these stretches. On those still, foggy nights the sensor a few blocks from you can read very differently from one across town, which is why it helps to watch the reading closest to home rather than a single city number.
Field burning: a valley tradition that has mostly, but not entirely, ended
The Willamette Valley is grass-seed country, and for decades growers burned their fields after harvest to clear stubble and kill pests. The smoke was a defining summer nuisance. In 1969 a field-burn inversion over the valley drew more than 5,000 air-pollution complaints and a temporary ban from Governor Tom McCall, and in 1988 a chain-reaction wreck in field-burn smoke on Interstate 5 near Albany killed seven people, which pushed the Legislature toward reform.
Oregon phased out most Willamette Valley field burning in 2009 with Senate Bill 528, capping it at a small fraction of what it once was. Some limited burning is still permitted in the north valley on approved days, so on a hot, still late-summer afternoon you may still catch agricultural smoke, but it is a shadow of the practice older Salem residents remember.
Salem air quality FAQ
What is the air quality in Salem right now?
As of September 5, 2026 at 5:10 AM PDT, the air quality in Salem, Oregon is AQI 24 — Good — with PM2.5 at 4.3 µg/m³, the median of 4 live PurpleAir sensors. Open the windows. Great for outdoor activity.
Why does wildfire smoke hit Salem so hard?
Salem sits at the west end of the Santiam Canyon, which channels smoke straight out of the Cascades and onto the valley floor. In September 2020 the Beachie Creek Fire came down that canyon toward the city and pushed Salem's air quality index above 500, past the top of the EPA scale. When a fire is burning in the Cascades east of town, the canyon can funnel that smoke over Salem within hours.
Why is Salem's air worse on cold, calm winter nights?
On still winter nights the Willamette Valley forms a temperature inversion, a lid of warmer air that traps colder air and everything in it against the valley floor. Wood smoke from stoves and fireplaces collects under that lid instead of dispersing, and Oregon's DEQ often issues particulate advisories or wood-burning restrictions during these stretches. Readings can vary a lot block to block, so the sensor nearest you is the one to watch.
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 Salem, 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 Salem
We watch Salem's air. You live your life.
Set your threshold once and get a heads-up only when the air actually changes for you. Free on the App Store & Google Play.