Tacoma Air Quality in 2025
In 2025, Tacoma's air quality (Seattle-Tacoma-Bellevue, WA area) had a median daily AQI of 48 (Good) across 365 monitored days. 1 day (0.3%) reached Unhealthy for Sensitive Groups or worse, 204 were Good, and the year's peak AQI was 125 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 216 of those days. The cleanest month of 2025 was December (median AQI 42, 0 days above 100) and the worst was September (median 53, 1 day above 100, peak 125).
- Good: 55.9%
- Moderate: 43.8%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
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How was Tacoma's air quality in 2025?
Good on a typical day: median AQI 48, with 1 day above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 125 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 216 days.
- ✓Cleanest month: December; worst: September.
Frequently asked questions
What was the average AQI in Tacoma in 2025?▾
EPA's Air Quality System puts Tacoma's (Seattle-Tacoma-Bellevue, WA) median daily AQI for 2025 at 48, which is Good. 1 day were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 125.
Which month had the worst air quality in Tacoma in 2025?▾
The cleanest month of 2025 was December (median AQI 42, 0 days above 100) and the worst was September (median 53, 1 day above 100, peak 125).
Was 2025 a good or bad year for Tacoma's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2025's median of 48 is in line with the area's typical annual median of 49.
Tacoma month by month in 2025
Tacoma air quality month by month, 2025 (Seattle-Tacoma-Bellevue, WA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 70 | 0 | 89 | PM2.5 |
| February | 28 | 54 | 0 | 73 | PM2.5 |
| March | 31 | 44 | 0 | 66 | O3 |
| April | 30 | 46 | 0 | 62 | O3 |
| May | 31 | 46 | 0 | 100 | O3 |
| June | 30 | 44 | 0 | 77 | O3 |
| July | 31 | 45 | 0 | 69 | O3 |
| August | 31 | 44 | 0 | 90 | PM2.5 |
| Septemberworst | 30 | 53 | 1 | 125 | PM2.5 |
| October | 31 | 51 | 0 | 61 | PM2.5 |
| November | 30 | 52 | 0 | 73 | PM2.5 |
| Decembercleanest | 31 | 42 | 0 | 85 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2025's median of 48 is in line with the area's typical annual median of 49.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Tacoma
The latest EPA AirNow observation puts Tacoma's AQI at 41 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Tacoma air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Seattle-Tacoma-Bellevue, 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.