Visalia Air Quality in 2024
In 2024, Visalia's air quality (Visalia-Porterville, CA area) had a median daily AQI of 71 (Moderate) across 366 monitored days. 111 days (30.3%) reached Unhealthy for Sensitive Groups or worse, 76 were Good, and the year's peak AQI was 185 (Unhealthy). Ground-level ozone set the daily AQI on 213 of those days. The cleanest month of 2024 was February (median AQI 42, 0 days above 100) and the worst was July (median 143, 28 days above 100, peak 185).
- Good: 20.8%
- Moderate: 48.9%
- Unhealthy for Sensitive Groups: 22.7%
- Unhealthy or worse: 7.7%
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 2024?
Moderate on a typical day: median AQI 71, with 111 days above AQI 100 out of 366 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 185 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 213 days.
- ✓Cleanest month: February; worst: July.
Frequently asked questions
What was the average AQI in Visalia in 2024?▾
EPA's Air Quality System puts Visalia's (Visalia-Porterville, CA) median daily AQI for 2024 at 71, which is Moderate. 111 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 185.
Which month had the worst air quality in Visalia in 2024?▾
The cleanest month of 2024 was February (median AQI 42, 0 days above 100) and the worst was July (median 143, 28 days above 100, peak 185).
Was 2024 a good or bad year for Visalia's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100. 2024's median of 71 is in line with the area's typical annual median of 71.
Visalia month by month in 2024
Visalia air quality month by month, 2024 (Visalia-Porterville, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 57 | 1 | 110 | PM2.5 |
| Februarycleanest | 29 | 42 | 0 | 81 | PM2.5 |
| March | 31 | 42 | 0 | 55 | O3 |
| April | 30 | 50 | 0 | 87 | O3 |
| May | 31 | 74 | 6 | 133 | O3 |
| June | 30 | 114 | 20 | 166 | O3 |
| Julyworst | 31 | 143 | 28 | 185 | O3 |
| August | 31 | 108 | 18 | 151 | O3 |
| September | 30 | 116 | 19 | 161 | O3 |
| October | 31 | 87 | 11 | 174 | O3 |
| November | 30 | 65 | 0 | 83 | PM2.5 |
| December | 31 | 75 | 8 | 157 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100.
2024's median of 71 is in line with 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.