Tacoma Air Quality in 2024
In 2024, Tacoma's air quality (Seattle-Tacoma-Bellevue, WA area) had a median daily AQI of 47 (Good) across 366 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 211 were Good, and the year's peak AQI was 166 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 223 of those days. The cleanest month of 2024 was May (median AQI 42, 0 days above 100) and the worst was July (median 51, 4 days above 100, peak 166).
- Good: 57.7%
- Moderate: 41.3%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.3%
Improve Indoor Air Quality
Even with good outdoor air in Tacoma, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Recommended: Levoit Core 400S — True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How was Tacoma's air quality in 2024?
Good on a typical day: median AQI 47, with 4 days above AQI 100 out of 366 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 166 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 223 days.
- ✓Cleanest month: May; worst: July.
Frequently asked questions
What was the average AQI in Tacoma in 2024?▾
EPA's Air Quality System puts Tacoma's (Seattle-Tacoma-Bellevue, WA) median daily AQI for 2024 at 47, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 166.
Which month had the worst air quality in Tacoma in 2024?▾
The cleanest month of 2024 was May (median AQI 42, 0 days above 100) and the worst was July (median 51, 4 days above 100, peak 166).
Was 2024 a good or bad year for Tacoma's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 3rd cleanest by days above AQI 100. 2024's median of 47 is in line with the area's typical annual median of 49.
Tacoma month by month in 2024
Tacoma air quality month by month, 2024 (Seattle-Tacoma-Bellevue, WA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 53 | 0 | 96 | PM2.5 |
| February | 29 | 54 | 0 | 70 | PM2.5 |
| March | 31 | 46 | 0 | 67 | PM2.5 |
| April | 30 | 46 | 0 | 55 | O3 |
| Maycleanest | 31 | 42 | 0 | 67 | O3 |
| June | 30 | 44 | 0 | 77 | O3 |
| Julyworst | 31 | 51 | 4 | 166 | PM2.5 |
| August | 31 | 48 | 0 | 90 | PM2.5 |
| September | 30 | 48 | 0 | 76 | PM2.5 |
| October | 31 | 49 | 0 | 96 | PM2.5 |
| November | 30 | 47 | 0 | 74 | PM2.5 |
| December | 31 | 54 | 0 | 86 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 3rd cleanest by days above AQI 100.
2024's median of 47 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.