Spokane Air Quality in Winter
Across 2019–2025, Spokane's winter (December–February) air quality had a median AQI of 56 (Moderate) over 632 monitored days in the Spokane-Spokane Valley, WA area. 0.0% of winter days (0 of 632) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 93.8% of days. The cleanest winter on record here was 2024 (median AQI 52, 0 days above 100) and the worst was 2022 (median 60, 0 days above 100, peak AQI 76).
- Good: 27.8%
- Moderate: 72.2%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Spokane in winter?
Moderate on a typical day: median AQI 56 across 2019–2025, with 0.0% of winter days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓27.8% of winter days were Good (AQI 0–50), 72.2% Moderate (51–100).
- ✓0 days of 632 reached AQI 101+; the winter peak was 100.
- ✓Cleanest month: February; worst month: January.
Frequently asked questions
What is the air quality like in Spokane in winter?▾
Across 2019–2025, the median daily AQI in Spokane in winter was 56 (Moderate). 27.8% of days were Good, 72.2% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 632 monitored days in EPA's Air Quality System.
Is winter a good time for outdoor exercise in Spokane?▾
A typical winter day in Spokane is Moderate (median AQI 56): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of winter days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Spokane's winter air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 93.8% of winter days in Spokane. The highest winter AQI recorded in 2019–2025 was 100 (Moderate), in 2022.
Spokane winter air quality, year by year
Spokane winter air quality by year (Spokane-Spokane Valley, WA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 90 | 58 | 0 | 100 | PM2.5 |
| 2020 | 91 | 58 | 0 | 87 | PM2.5 |
| 2021 | 90 | 55 | 0 | 81 | PM2.5 |
| 2022worst | 90 | 60 | 0 | 76 | PM2.5 |
| 2023 | 90 | 57 | 0 | 84 | PM2.5 |
| 2024cleanest | 91 | 52 | 0 | 87 | PM2.5 |
| 2025 | 90 | 52 | 0 | 77 | PM2.5 |
What winter air means in Spokane
A typical winter day in Spokane is Moderate (median AQI 56): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of winter days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Winter's median AQI of 56 is above Spokane's whole-year median of 47, making it one of the area's dirtier periods. Nationally, the median Winter AQI across every EPA metro area (278,620 metro-days, 2019–2025) is 40, so Spokane runs above the national Winter norm; 0.0% of its Winter days topped AQI 100 versus 0.6% nationally (about the same).
Within the season, February is the cleanest month (median AQI 54, 0.0% of days above 100) and January the worst (median 58, 0.0% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Spokane
The latest EPA AirNow observation puts Spokane's AQI at 35 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Spokane air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Spokane-Spokane Valley, WA), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.