Spokane Air Quality in May
Across 2019–2025, Spokane's May air quality had a median AQI of 42 (Good) over 217 monitored days in the Spokane-Spokane Valley, WA area. 0.0% of May days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 86.2% of days. The cleanest May on record here was 2020 (median AQI 35, 0 days above 100) and the worst was 2023 (median 47, 0 days above 100, peak AQI 81).
- Good: 88.5%
- Moderate: 11.5%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Spokane in May?
Good on a typical day: median AQI 42 across 2019–2025, with 0.0% of May days above AQI 100. Ground-level ozone is the main driver.
- ✓88.5% of May days were Good (AQI 0–50), 11.5% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the May peak was 81.
- ✓Best May: 2020; worst May: 2023.
Frequently asked questions
What is the air quality like in Spokane in May?▾
Across 2019–2025, the median daily AQI in Spokane in May was 42 (Good). 88.5% of days were Good, 11.5% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is May a good time for outdoor exercise in Spokane?▾
A typical May day in Spokane sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of May days reached AQI 101+ in 2019–2025.
Which pollutant causes Spokane's May air quality problems?▾
Ground-level ozone set the daily AQI on 86.2% of May days in Spokane. The highest May AQI recorded in 2019–2025 was 81 (Moderate), in 2023.
Spokane May air quality, year by year
Spokane May 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 | 44 | 0 | 64 | O3 |
| 2020cleanest | 31 | 35 | 0 | 53 | O3 |
| 2021 | 31 | 43 | 0 | 53 | O3 |
| 2022 | 31 | 38 | 0 | 45 | O3 |
| 2023worst | 31 | 47 | 0 | 81 | O3 |
| 2024 | 31 | 41 | 0 | 65 | O3 |
| 2025 | 31 | 44 | 0 | 71 | O3 |
What May air means in Spokane
A typical May day in Spokane sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of May days reached AQI 101+ in 2019–2025.
May's median AQI of 42 is below Spokane's whole-year median of 47, making it one of the area's cleaner periods. Nationally, the median May AQI across every EPA metro area (104,064 metro-days, 2019–2025) is 44, so Spokane runs in line with the national May norm; 0.0% of its May days topped AQI 100 versus 1.3% nationally (below average).
May is part of Spokane's spring season (March, April, May); the spring 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.