Spokane Air Quality in 2020
In 2020, Spokane's air quality (Spokane-Spokane Valley, WA area) had a median daily AQI of 47 (Good) across 366 monitored days. 9 days (2.5%) reached Unhealthy for Sensitive Groups or worse, 206 were Good, and the year's peak AQI was 957 (Hazardous). Fine particulate matter (PM2.5) set the daily AQI on 267 of those days. The cleanest month of 2020 was June (median AQI 34, 0 days above 100) and the worst was September (median 57, 9 days above 100, peak 957).
- Good: 56.3%
- Moderate: 41.3%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 2.2%
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How was Spokane's air quality in 2020?
Good on a typical day: median AQI 47, with 9 days above AQI 100 out of 366 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2020: 957 (Hazardous).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 267 days.
- ✓Cleanest month: June; worst: September.
Frequently asked questions
What was the average AQI in Spokane in 2020?▾
EPA's Air Quality System puts Spokane's (Spokane-Spokane Valley, WA) median daily AQI for 2020 at 47, which is Good. 9 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 957.
Which month had the worst air quality in Spokane in 2020?▾
The cleanest month of 2020 was June (median AQI 34, 0 days above 100) and the worst was September (median 57, 9 days above 100, peak 957).
Was 2020 a good or bad year for Spokane's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 4th cleanest by days above AQI 100. 2020's median of 47 is in line with the area's typical annual median of 47.
Spokane month by month in 2020
Spokane air quality month by month, 2020 (Spokane-Spokane Valley, WA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 58 | 0 | 71 | PM2.5 |
| February | 29 | 61 | 0 | 87 | PM2.5 |
| March | 31 | 46 | 0 | 62 | PM2.5 |
| April | 30 | 37 | 0 | 52 | PM2.5 |
| May | 31 | 35 | 0 | 53 | O3 |
| Junecleanest | 30 | 34 | 0 | 45 | O3 |
| July | 31 | 37 | 0 | 62 | O3 |
| August | 31 | 45 | 0 | 64 | O3 |
| Septemberworst | 30 | 57 | 9 | 957 | PM2.5 |
| October | 31 | 53 | 0 | 76 | PM2.5 |
| November | 30 | 56 | 0 | 92 | PM2.5 |
| December | 31 | 58 | 0 | 85 | PM2.5 |
How 2020 compares
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 4th cleanest by days above AQI 100.
2020's median of 47 is in line with the area's typical annual median of 47.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Spokane
The latest EPA AirNow observation puts Spokane's AQI at 38 (PM2.5). The figures above are multi-year annual 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.