Spokane Air Quality in Summer
Across 2019–2025, Spokane's summer (June–August) air quality had a median AQI of 45 (Good) over 644 monitored days in the Spokane-Spokane Valley, WA area. 4.1% of summer days (26 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 66.9% of days. The cleanest summer on record here was 2020 (median AQI 39, 0 days above 100) and the worst was 2021 (median 59, 16 days above 100, peak AQI 223).
- Good: 64.4%
- Moderate: 31.5%
- Unhealthy for Sensitive Groups: 1.9%
- Unhealthy or worse: 2.2%
Improve Indoor Air Quality
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How is the air in Spokane in summer?
Good on a typical day: median AQI 45 across 2019–2025, with 4.1% of summer days above AQI 100. Ground-level ozone is the main driver.
- ✓64.4% of summer days were Good (AQI 0–50), 31.5% Moderate (51–100).
- ✓26 days of 644 reached AQI 101+; the summer peak was 447.
- ✓Cleanest month: June; worst month: August.
Frequently asked questions
What is the air quality like in Spokane in summer?▾
Across 2019–2025, the median daily AQI in Spokane in summer was 45 (Good). 64.4% of days were Good, 31.5% Moderate, and 4.1% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is summer a good time for outdoor exercise in Spokane?▾
A typical summer day in Spokane sits in the Good range (median AQI 45), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 24 of summer days (4.1%) reached AQI 101+ in 2019–2025.
Which pollutant causes Spokane's summer air quality problems?▾
Ground-level ozone set the daily AQI on 66.9% of summer days in Spokane. The highest summer AQI recorded in 2019–2025 was 447 (Hazardous), in 2021.
Spokane summer air quality, year by year
Spokane summer 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 | 92 | 43 | 2 | 146 | O3 |
| 2020cleanest | 92 | 39 | 0 | 64 | O3 |
| 2021worst | 92 | 59 | 16 | 223 | PM2.5 |
| 2022 | 92 | 42 | 0 | 74 | O3 |
| 2023 | 92 | 52 | 7 | 447 | O3 |
| 2024 | 92 | 49 | 0 | 100 | O3 |
| 2025 | 92 | 47 | 1 | 127 | O3 |
What summer air means in Spokane
A typical summer day in Spokane sits in the Good range (median AQI 45), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 24 of summer days (4.1%) reached AQI 101+ in 2019–2025.
Summer's median AQI of 45 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 Summer AQI across every EPA metro area (308,645 metro-days, 2019–2025) is 46, so Spokane runs in line with the national Summer norm; 4.1% of its Summer days topped AQI 100 versus 3.6% nationally (about the same).
Within the season, June is the cleanest month (median AQI 41, 0.0% of days above 100) and August the worst (median 51, 8.3% above 100).
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 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.