Tacoma Air Quality in July
Across 2019–2025, Tacoma's July air quality had a median AQI of 44 (Good) over 217 monitored days in the Seattle-Tacoma-Bellevue, WA area. 6.0% of July days (13 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 50.7% of days. The cleanest July on record here was 2019 (median AQI 40, 0 days above 100) and the worst was 2022 (median 48, 5 days above 100, peak AQI 143).
- Good: 65.9%
- Moderate: 28.1%
- Unhealthy for Sensitive Groups: 4.6%
- Unhealthy or worse: 1.4%
Improve Indoor Air Quality
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How is the air in Tacoma in July?
Good on a typical day: median AQI 44 across 2019–2025, with 6.0% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓65.9% of July days were Good (AQI 0–50), 28.1% Moderate (51–100).
- ✓13 days of 217 reached AQI 101+; the July peak was 195.
- ✓Best July: 2019; worst July: 2022.
Frequently asked questions
What is the air quality like in Tacoma in July?▾
Across 2019–2025, the median daily AQI in Tacoma in July was 44 (Good). 65.9% of days were Good, 28.1% Moderate, and 6.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Tacoma?▾
A typical July day in Tacoma sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 17 of July days (6.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Tacoma's July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 50.7% of July days in Tacoma. The highest July AQI recorded in 2019–2025 was 195 (Unhealthy), in 2022.
Tacoma July air quality, year by year
Tacoma July 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 | 31 | 40 | 0 | 80 | PM2.5 |
| 2020 | 31 | 41 | 1 | 144 | PM2.5 |
| 2021 | 31 | 45 | 1 | 126 | O3 |
| 2022worst | 31 | 48 | 5 | 143 | O3 |
| 2023 | 31 | 43 | 2 | 195 | O3 |
| 2024 | 31 | 51 | 4 | 166 | PM2.5 |
| 2025 | 31 | 45 | 0 | 69 | O3 |
What July air means in Tacoma
A typical July day in Tacoma sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 17 of July days (6.0%) reached AQI 101+ in 2019–2025.
July's median AQI of 44 is below Tacoma's whole-year median of 49, making it one of the area's cleaner periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Tacoma runs in line with the national July norm; 6.0% of its July days topped AQI 100 versus 3.6% nationally (above average).
July is part of Tacoma's summer season (June, July, August); the summer 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.