Spokane Air Quality in October
Across 2019–2025, Spokane's October air quality had a median AQI of 46 (Good) over 217 monitored days in the Spokane-Spokane Valley, WA area. 1.4% of October days (3 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 98.6% of days. The cleanest October on record here was 2025 (median AQI 37, 0 days above 100) and the worst was 2022 (median 56, 2 days above 100, peak AQI 121).
- Good: 55.3%
- Moderate: 43.3%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 0.0%
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How is the air in Spokane in October?
Good on a typical day: median AQI 46 across 2019–2025, with 1.4% of October days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓55.3% of October days were Good (AQI 0–50), 43.3% Moderate (51–100).
- ✓3 days of 217 reached AQI 101+; the October peak was 121.
- ✓Best October: 2025; worst October: 2022.
Frequently asked questions
What is the air quality like in Spokane in October?▾
Across 2019–2025, the median daily AQI in Spokane in October was 46 (Good). 55.3% of days were Good, 43.3% Moderate, and 1.4% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is October a good time for outdoor exercise in Spokane?▾
A typical October day in Spokane sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 71 of October days (1.4%) reached AQI 101+ in 2019–2025.
Which pollutant causes Spokane's October air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 98.6% of October days in Spokane. The highest October AQI recorded in 2019–2025 was 121 (Unhealthy for Sensitive Groups), in 2022.
Spokane October air quality, year by year
Spokane October 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 | 31 | 51 | 0 | 82 | PM2.5 |
| 2020 | 31 | 53 | 0 | 76 | PM2.5 |
| 2021 | 31 | 41 | 0 | 61 | PM2.5 |
| 2022worst | 31 | 56 | 2 | 121 | PM2.5 |
| 2023 | 31 | 48 | 1 | 110 | PM2.5 |
| 2024 | 31 | 38 | 0 | 73 | PM2.5 |
| 2025cleanest | 31 | 37 | 0 | 88 | PM2.5 |
What October air means in Spokane
A typical October day in Spokane sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 71 of October days (1.4%) reached AQI 101+ in 2019–2025.
October's median AQI of 46 is in line with Spokane's whole-year median of 47, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median October AQI across every EPA metro area (102,872 metro-days, 2019–2025) is 38, so Spokane runs above the national October norm; 1.4% of its October days topped AQI 100 versus 1.3% nationally (about the same).
October is part of Spokane's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Spokane
The latest EPA AirNow observation puts Spokane's AQI at 26 (PM2.5). The figures above are multi-year month 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.