Visalia Air Quality in 2019
In 2019, Visalia's air quality (Visalia-Porterville, CA area) had a median daily AQI of 67 (Moderate) across 365 monitored days. 81 days (22.2%) reached Unhealthy for Sensitive Groups or worse, 98 were Good, and the year's peak AQI was 280 (Very Unhealthy). Ground-level ozone set the daily AQI on 210 of those days. The cleanest month of 2019 was February (median AQI 38, 0 days above 100) and the worst was August (median 126, 23 days above 100, peak 150).
- Good: 26.8%
- Moderate: 51.0%
- Unhealthy for Sensitive Groups: 21.4%
- Unhealthy or worse: 0.8%
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How was Visalia's air quality in 2019?
Moderate on a typical day: median AQI 67, with 81 days above AQI 100 out of 365 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 280 (Very Unhealthy).
- ✓Ground-level ozone was the main pollutant on 210 days.
- ✓Cleanest month: February; worst: August.
Frequently asked questions
What was the average AQI in Visalia in 2019?▾
EPA's Air Quality System puts Visalia's (Visalia-Porterville, CA) median daily AQI for 2019 at 67, which is Moderate. 81 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 280.
Which month had the worst air quality in Visalia in 2019?▾
The cleanest month of 2019 was February (median AQI 38, 0 days above 100) and the worst was August (median 126, 23 days above 100, peak 150).
Was 2019 a good or bad year for Visalia's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 2nd cleanest by days above AQI 100. 2019's median of 67 is below the area's typical annual median of 71.
Visalia month by month in 2019
Visalia air quality month by month, 2019 (Visalia-Porterville, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 61 | 6 | 138 | PM2.5 |
| Februarycleanest | 28 | 38 | 0 | 75 | O3 |
| March | 31 | 44 | 0 | 62 | PM2.5 |
| April | 30 | 52 | 0 | 93 | O3 |
| May | 31 | 54 | 0 | 93 | O3 |
| June | 30 | 93 | 11 | 143 | O3 |
| July | 31 | 108 | 16 | 136 | O3 |
| Augustworst | 31 | 126 | 23 | 150 | O3 |
| September | 30 | 92 | 13 | 136 | O3 |
| October | 31 | 80 | 6 | 280 | O3 |
| November | 30 | 86 | 6 | 151 | PM2.5 |
| December | 31 | 56 | 0 | 96 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 2nd cleanest by days above AQI 100.
2019's median of 67 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 57 (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.