Tacoma Air Quality in April
Across 2019–2025, Tacoma's April air quality had a median AQI of 46 (Good) over 210 monitored days in the Seattle-Tacoma-Bellevue, WA area. 0.0% of April days (0 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 60.5% of days. The cleanest April on record here was 2019 (median AQI 44, 0 days above 100) and the worst was 2020 (median 52, 0 days above 100, peak AQI 64).
- Good: 73.8%
- Moderate: 26.2%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Tacoma in April?
Good on a typical day: median AQI 46 across 2019–2025, with 0.0% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓73.8% of April days were Good (AQI 0–50), 26.2% Moderate (51–100).
- ✓0 days of 210 reached AQI 101+; the April peak was 72.
- ✓Best April: 2019; worst April: 2020.
Frequently asked questions
What is the air quality like in Tacoma in April?▾
Across 2019–2025, the median daily AQI in Tacoma in April was 46 (Good). 73.8% of days were Good, 26.2% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Tacoma?▾
A typical April day in Tacoma sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of April days reached AQI 101+ in 2019–2025.
Which pollutant causes Tacoma's April air quality problems?▾
Ground-level ozone set the daily AQI on 60.5% of April days in Tacoma. The highest April AQI recorded in 2019–2025 was 72 (Moderate), in 2020.
Tacoma April air quality, year by year
Tacoma April air quality by year (Seattle-Tacoma-Bellevue, WA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 44 | 0 | 54 | O3 |
| 2020worst | 30 | 52 | 0 | 64 | PM2.5 |
| 2021 | 30 | 51 | 0 | 72 | PM2.5 |
| 2022 | 30 | 45 | 0 | 54 | O3 |
| 2023 | 30 | 44 | 0 | 60 | O3 |
| 2024 | 30 | 46 | 0 | 55 | O3 |
| 2025 | 30 | 46 | 0 | 62 | O3 |
What April air means in Tacoma
A typical April day in Tacoma sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of April days reached AQI 101+ in 2019–2025.
April's median AQI of 46 is in line with Tacoma's whole-year median of 49, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Tacoma runs in line with the national April norm; 0.0% of its April days topped AQI 100 versus 0.7% nationally (about the same).
April is part of Tacoma's spring season (March, April, May); the spring page pools all three months.
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 month 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.