Air Quality in Anchorage, Alaska — Live

Live readings from PurpleAir sensors across Anchorage — with free alerts when winter inversions or wildfire smoke move in.

Live Anchorage AQI from nearby PurpleAir sensors loads when this page opens in a browser, along with a live sensor map covering Anchorage and Eagle River, Chugiak, Girdwood, Wasilla.

Anchorage's air is good most of the year, helped by a coastal climate and winds off Cook Inlet that keep things from sitting still for long. The exceptions are specific and predictable: from roughly October through March, cold, calm nights can lock a temperature inversion over the city and trap wood smoke and exhaust close to the ground for days at a stretch, and in June through August, wildfire smoke from the Kenai Peninsula or Mat-Su can drift into town even when the fire itself is a hundred miles away.

Canairy watches the sensors around your home, your kids' school, and everywhere else you care about, and tells you in plain English when the air changes enough to matter.

Anchorage's winters trap smoke in "the bowl"

Locals call the lowland shelf between Cook Inlet and the Chugach Mountains "the bowl," and the same geography that gives Anchorage its rain shadow also works against it in winter. The Alaska Department of Environmental Conservation tracks PM2.5 here specifically because strong temperature inversions are common from October through March: cold air pools at ground level under a warmer layer above, and whatever gets released into it — wood-stove smoke, exhaust from cold-soaked engines, heating-oil combustion — has nowhere to go until the inversion breaks.

The fixes have mostly targeted the biggest single source. The Municipality regulates the installation of outdoor wood boilers, and the state's Burnwise program tracks which stove models can legally be sold, because on a still, sub-zero night a neighborhood of smoldering stoves can push a monitor into unhealthy territory before sunrise. There's no such thing as a typical Anchorage winter reading — a calm, -10°F night with everyone burning wood looks nothing like a windy, 20°F afternoon, which is exactly the gap a live sensor reading is built to catch instead of a seasonal average.

Anchorage's air-quality history was actually about dust, not smoke

Long before wildfire smoke became the seasonal concern, Anchorage had a federal nonattainment problem over windblown dust off unpaved roads. Between 1985 and 1987 the Municipality recorded violations of the old particulate standard, largely because much of the city was still gravel-road terrain and one monitor sat beside a heavily trafficked dirt street. The response was blunt and effective: Anchorage paved and resurfaced its gravel roads through the early 1990s — 8.6 miles alone with recycled asphalt product in 1992-1993 — and the city hasn't recorded a violation since October 1987.

Eagle River, a community about 12 miles north of downtown that's part of the Municipality, carried its own separate PM10 nonattainment designation for the same reason long after the main bowl cleared up, and didn't get the EPA's sign-off on a redesignation and maintenance plan until 2013. It's a reminder that Anchorage's dust problem, unlike its smoke problem, was entirely local and solvable — once the roads were paved, the exceedances simply stopped.

Wildfire smoke and volcanic ash are the wild cards

Southcentral Alaska's fire season runs roughly June through August, and fires burning well outside city limits can still fill the bowl with smoke. The 2019 Swan Lake Fire, lightning-sparked on June 5 on the Kenai Peninsula and eventually burning roughly 170,000 acres, sent smoke into Anchorage repeatedly that summer; by August 19 the city's own particulate reading had climbed to nearly 200 — unhealthy for everyone — and the municipal health department issued an advisory.

The other wild card is one few US cities plan around: volcanic ash. Mount Spurr, an active volcano about 75 miles west across Cook Inlet, has dusted Anchorage before — a 1992 eruption from its Crater Peak vent dropped roughly a quarter inch of ash on the city and closed Ted Stevens International Airport for two days. Spurr stirred again through 2024 and into 2025, with enough earthquakes and ground deformation that the Alaska Volcano Observatory raised its alert level and the Municipality activated its volcano response plan, before activity eased and the alert was lifted in August 2025. Fine ash is a respiratory hazard for the same reason PM2.5 is, which is why it shows up on the same sensors.

Anchorage air quality FAQ

What is the air quality in Anchorage right now?

This page shows the current AQI for Anchorage, calculated from PurpleAir sensors across the bowl and surrounding communities and updated continuously. The map below shows every live sensor, so you can check the reading closest to your own neighborhood.

Why does Anchorage's air get bad in winter?

From roughly October through March, strong temperature inversions can settle over the Anchorage bowl and trap cold air near the ground for days at a time — along with wood-stove smoke, vehicle exhaust, and heating-oil combustion. It's a different mechanism from wildfire smoke, which is why state monitors track PM2.5 through the winter as well as through fire season.

Does wildfire smoke reach Anchorage?

Yes. Southcentral Alaska's fire season runs roughly June through August, and smoke from fires on the Kenai Peninsula or in the Mat-Su Valley can drift into the bowl even when the fire itself is many miles away. The 2019 Swan Lake Fire pushed Anchorage's own particulate reading to nearly 200 and prompted a municipal health advisory.

What AQI level is unhealthy?

Under the US EPA scale, AQI 0-50 is Good and 51-100 is Moderate. From 101 the air is Unhealthy for Sensitive Groups - kids, older adults, and people with asthma or heart conditions - and above 150 it's Unhealthy for everyone. Canairy translates these numbers into a plain-English verdict, like whether to close the windows or move a workout indoors.

Where does Canairy's Anchorage data come from?

Readings come from PurpleAir's network of laser particle sensors across Anchorage and surrounding towns, cross-referenced with government monitors and the Google Air Quality API. You can see every sensor behind your numbers on the live map - there's no black box.

Is Canairy free?

Yes. The Canairy app is free to download and includes live air quality for all your saved places, plain-English verdicts, and free push alerts when the air crosses your threshold. A paid plan adds extras like SMS text alerts.

Get Canairy free on Google Play.