Visalia Air Quality in August
Across 2019–2025, Visalia's August air quality had a median AQI of 115 (Unhealthy for Sensitive Groups) over 217 monitored days in the Visalia-Porterville, CA area. 64.5% of August days (140 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 92.6% of days. The cleanest August on record here was 2025 (median AQI 87, 10 days above 100) and the worst was 2020 (median 126, 26 days above 100, peak AQI 225).
- Good: 2.3%
- Moderate: 33.2%
- Unhealthy for Sensitive Groups: 53.0%
- Unhealthy or worse: 11.5%
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.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in Visalia in August?
Unhealthy for Sensitive Groups on a typical day: median AQI 115 across 2019–2025, with 64.5% of August days above AQI 100. Ground-level ozone is the main driver.
- ✓2.3% of August days were Good (AQI 0–50), 33.2% Moderate (51–100).
- ✓140 days of 217 reached AQI 101+; the August peak was 225.
- ✓Best August: 2025; worst August: 2020.
Frequently asked questions
What is the air quality like in Visalia in August?▾
Across 2019–2025, the median daily AQI in Visalia in August was 115 (Unhealthy for Sensitive Groups). 2.3% of days were Good, 33.2% Moderate, and 64.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is August a good time for outdoor exercise in Visalia?▾
A typical August day in Visalia is already Unhealthy for Sensitive Groups (median AQI 115): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 65% of August days (64.5%) were at that level or worse.
Which pollutant causes Visalia's August air quality problems?▾
Ground-level ozone set the daily AQI on 92.6% of August days in Visalia. The highest August AQI recorded in 2019–2025 was 225 (Very Unhealthy), in 2020.
Visalia August air quality, year by year
Visalia August air quality by year (Visalia-Porterville, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 126 | 23 | 150 | O3 |
| 2020worst | 31 | 126 | 26 | 225 | O3 |
| 2021 | 31 | 136 | 25 | 179 | O3 |
| 2022 | 31 | 122 | 25 | 172 | O3 |
| 2023 | 31 | 97 | 13 | 154 | O3 |
| 2024 | 31 | 108 | 18 | 151 | O3 |
| 2025cleanest | 31 | 87 | 10 | 136 | O3 |
What August air means in Visalia
A typical August day in Visalia is already Unhealthy for Sensitive Groups (median AQI 115): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 65% of August days (64.5%) were at that level or worse.
August's median AQI of 115 is above Visalia's whole-year median of 71, making it one of the area's dirtier periods. Nationally, the median August AQI across every EPA metro area (104,152 metro-days, 2019–2025) is 45, so Visalia runs above the national August norm; 64.5% of its August days topped AQI 100 versus 3.5% nationally (above average).
August is part of Visalia's summer season (June, July, August); the summer page pools all three months.
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 month 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.