Spokane, WA Air Quality Index (AQI) Today

That color and number are today’s read on Spokane air quality. What they’re actually deciding is the dog walk, the kid’s afternoon at the park, whether the windows stay open tonight. BreatheCheck tracks the air quality Spokane has actually breathed since we began measuring here, not just the one figure updating above. Set your number once and let an email tell you when fire season crosses it.

How does today compare with Spokane’s record so far?

Since 16 August 2026 we have recorded 30 days for Spokane. 5 went above AQI 100, and the highest daily maximum was 174, on 10 September 2026. The day-by-day record is further down.

One reading says nothing about the shape behind it. BreatheCheck rebuilds the air quality Spokane has seen since we began measuring here, from the same hourly AQI feed as the number above.

The page also carries a running count of days above AQI 100 since we began counting. That shape matters more here than almost anywhere else in this project. The 12-month average for Spokane search interest runs 27,100, but the typical month is only 1,900. The average is dragged up by one event, not a steady baseline. IQAir, AccuWeather, aqicn and the state’s own monitor grid hand you today’s number and stop there. None tells you whether today is the typical month or the event.

Why is it hazy in Spokane today?

Spokane sits inland, east of the Cascades. Smoke reaches it from British Columbia, eastern Washington and the Idaho panhandle, drifting south and east. Three things can also make the sky look worse than the number suggests. The AQI smooths recent hours together, weighted toward the latest, so a genuinely bad afternoon takes a few hours to show up in full. Or the nearest working station is miles off, standing in for a metro the smoke didn’t reach evenly.

During one regional smoke event, a commenter on r/Seattle summed up the gap in one line: “Air sensor on ground, smoke up high (for now).” That gap is smoke aloft. Another reply on the same thread made it shorter still, a phrase that stuck: “Sky biiiig, smoke faaar,” four words and done. None of that makes the haze fake. A plume overhead and a monitor sitting under it covers each known cause.

What is causing the bad air in Spokane?

Spokane’s bad air is almost entirely a summer-and-fall wildfire story, unlike a city with a year-round traffic or industrial baseline. Search interest for air quality Spokane falls to just 880 by April, the lowest point of the year, then peaks in July 2026 at 165,000. Fine particulate matter (PM2.5) from burning vegetation is the dominant pollutant during these events.

One r/SeattleWA poster summed up how routine this has become. Since 2018, “we’ve basically had a period every summer our AQI has gone into the hazardous range.” They said it never got the coverage New York’s smoke did — a regional Pacific Northwest account, not a Spokane-specific one. No Spokane resident’s own words turned up in the material reviewed. The mechanism described here is the smoke corridor Spokane shares with Seattle, Eugene and Boise — a regional pattern, not a local voice. That’s a different particulate mix from vehicle exhaust, industrial haze or the coarser PM10 dust an agricultural valley deals with. It’s also the reason a moderate reading during smoke season can still smell and look far worse than the same number on an ordinary day.

What makes the call different in Spokane?

Spokane’s bad air arrives from somewhere else almost every time. Smoke drifts in from British Columbia, eastern Washington and the Idaho panhandle — not a local industrial source, not a winter inversion. Fire season, not winter, is when the reading actually turns here. Go on an ordinary reading. Short and unloaded: one lap of the block instead of three. Don’t go once smoke pushes the color into red.

EPA opens its everyone-warning at 151, Unhealthy. 201 to 300, Very Unhealthy, is that same warning at a more serious stage, not a separate group. Past roughly 200, wherever the smoke started, the plan moves indoors.

What AQI should you stay inside?

Fire season, not a routine pollution day, is when personal thresholds here shift hardest — further than the EPA’s single sensitive-groups line accounts for. EPA puts 101–150 in the Unhealthy for Sensitive Groups band — attributed to the agency, not a personal verdict.

An asthmatic runner logged 156 runs against AQI and found a cutoff at 60 — “my lungs struggle regardless of how well I’ve trained,” despite EPA calling nothing under 100 unhealthy. That log: 87% of runs under AQI 50 went fine, 42% between 50 and 70, just 12% above 70. A runner on r/Marathon_Training put a different number on it: “I’ll run in up to 110 because…error bars.” Parents online tend to land closer to 100, the cutoff for calling off a group outing.

Washington runs its own institutional line here, below the parental one, and it’s directly citable on this page. A Washington teacher named a hard ceiling — “80 is the absolute limit,” with kids kept inside once the reading passes 75. A Washington parent put their own daycare’s rule at the same number, hedged: “our daycare’s policy is everyone stays in when the AQI hits 80 I think.” A reported Washington 75, and how it compares covers the rest.

Indoors, default to a portable HEPA purifier or a Corsi-Rosenthal box — one builder in the community priced a 12x14 bedroom box at $130. A whole-house MERV-13 swap isn’t the default; it can choke airflow in an undersized system, and the safe version needs a static-pressure check from a licensed tech first. What actually works indoors during fire season has the detail.

Why our number may not match what you are seeing and smelling

The mismatch cuts two directions here, though one is far more common than the other. A smoky sky with a surprisingly calm number is direction one. That’s usually smoke sitting aloft above the monitor, or smoothing across recent hours holding back a rough afternoon. Direction two is less frequent in a smoke-dominated metro but still real: ground-level ozone from vehicle exhaust is invisible and odorless.

A clear, still summer day can carry a moderate reading with nothing visible to explain it. Neither direction means the number is wrong. It means the number and your senses are measuring different things.

Today’s reading for Spokane comes from AirNow’s Spokane reporting area, whose reference point sits about 0.9 miles from the metro centre. As of 14 September 2026 at 22:12 UTC.

A station miles off under-reports whichever side of the smoke plume sits farthest from it. Why a plume edge can sit between you and the station has the detail.

Why does Spokane’s air quality track fire season, not winter?

Winter search interest for air quality Spokane runs at just 8% of the rest of the year’s average. This isn’t a bimodal winter-and-fire metro the way Salt Lake City or Sacramento are. It’s a fire-season page for eleven months of quiet and one loud stretch. April sits at a 12-month low of 880; by July 2026 the same search climbs to 165,000.

The shape is stark — a single wildfire season doing essentially all of the year’s work. That’s a different mechanism from Salt Lake City’s Wasatch Front inversion or the San Joaquin Valley’s winter cold air pool. Both of those trap pollution locally through the cold months regardless of fire activity. Spokane’s air is mostly clean until smoke moves in from somewhere else.

Seattle, at the wet end of the same corridor and Eugene, at its southern edge take the same Pacific Northwest smoke. Boise catches many of the same regional fires. Unlike the inversion-driven pattern that shapes Salt Lake City’s winter and Sacramento’s valley winter, Spokane’s own peak is a summer-and-fall story, not a cold-month one.