Visalia Air Quality in 2025
In 2025, Visalia's air quality (Visalia-Porterville, CA area) had a median daily AQI of 64 (Moderate) across 365 monitored days. 43 days (11.8%) reached Unhealthy for Sensitive Groups or worse, 88 were Good, and the year's peak AQI was 147 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 197 of those days. The cleanest month of 2025 was March (median AQI 40, 0 days above 100) and the worst was June (median 97, 11 days above 100, peak 147).
- Good: 24.1%
- Moderate: 64.1%
- Unhealthy for Sensitive Groups: 11.8%
- Unhealthy or worse: 0.0%
Extra Protection for Visalia Homes
Air quality in Visalia is moderate (AQI 83), with particle pollution the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
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How was Visalia's air quality in 2025?
Moderate on a typical day: median AQI 64, with 43 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 147 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 197 days.
- ✓Cleanest month: March; worst: June.
Frequently asked questions
What was the average AQI in Visalia in 2025?▾
EPA's Air Quality System puts Visalia's (Visalia-Porterville, CA) median daily AQI for 2025 at 64, which is Moderate. 43 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 147.
Which month had the worst air quality in Visalia in 2025?▾
The cleanest month of 2025 was March (median AQI 40, 0 days above 100) and the worst was June (median 97, 11 days above 100, peak 147).
Was 2025 a good or bad year for Visalia'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 64 is below the area's typical annual median of 71.
Visalia month by month in 2025
Visalia air quality month by month, 2025 (Visalia-Porterville, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 69 | 1 | 104 | PM2.5 |
| February | 28 | 55 | 0 | 85 | PM2.5 |
| Marchcleanest | 31 | 40 | 0 | 57 | O3 |
| April | 30 | 53 | 0 | 71 | PM2.5 |
| May | 31 | 71 | 5 | 140 | O3 |
| Juneworst | 30 | 97 | 11 | 147 | O3 |
| July | 31 | 87 | 10 | 140 | O3 |
| August | 31 | 87 | 10 | 136 | O3 |
| September | 30 | 74 | 6 | 129 | O3 |
| October | 31 | 64 | 0 | 93 | PM2.5 |
| November | 30 | 66 | 0 | 94 | PM2.5 |
| December | 31 | 63 | 0 | 99 | 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 64 is below the area's typical annual median of 71.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Visalia
The latest EPA AirNow observation puts Visalia's AQI at 83 (PM10). The figures above are multi-year annual statistics, not today's reading.
View current Visalia air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Visalia-Porterville, CA), 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.