Visalia Air Quality in July
Across 2019–2025, Visalia's July air quality had a median AQI of 119 (Unhealthy for Sensitive Groups) over 217 monitored days in the Visalia-Porterville, CA area. 71.9% of July days (156 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 95.9% of days. The cleanest July on record here was 2025 (median AQI 87, 10 days above 100) and the worst was 2024 (median 143, 28 days above 100, peak AQI 185).
- Good: 3.2%
- Moderate: 24.9%
- Unhealthy for Sensitive Groups: 59.9%
- Unhealthy or worse: 12.0%
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.
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 July?
Unhealthy for Sensitive Groups on a typical day: median AQI 119 across 2019–2025, with 71.9% of July days above AQI 100. Ground-level ozone is the main driver.
- ✓3.2% of July days were Good (AQI 0–50), 24.9% Moderate (51–100).
- ✓156 days of 217 reached AQI 101+; the July peak was 185.
- ✓Best July: 2025; worst July: 2024.
Frequently asked questions
What is the air quality like in Visalia in July?▾
Across 2019–2025, the median daily AQI in Visalia in July was 119 (Unhealthy for Sensitive Groups). 3.2% of days were Good, 24.9% Moderate, and 71.9% 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 Visalia?▾
A typical July day in Visalia is already Unhealthy for Sensitive Groups (median AQI 119): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 72% of July days (71.9%) were at that level or worse.
Which pollutant causes Visalia's July air quality problems?▾
Ground-level ozone set the daily AQI on 95.9% of July days in Visalia. The highest July AQI recorded in 2019–2025 was 185 (Unhealthy), in 2024.
Visalia July air quality, year by year
Visalia July 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 | 108 | 16 | 136 | O3 |
| 2020 | 31 | 119 | 26 | 164 | O3 |
| 2021 | 31 | 129 | 28 | 174 | O3 |
| 2022 | 31 | 115 | 21 | 154 | O3 |
| 2023 | 31 | 115 | 27 | 159 | O3 |
| 2024worst | 31 | 143 | 28 | 185 | O3 |
| 2025cleanest | 31 | 87 | 10 | 140 | O3 |
What July air means in Visalia
A typical July day in Visalia is already Unhealthy for Sensitive Groups (median AQI 119): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 72% of July days (71.9%) were at that level or worse.
July's median AQI of 119 is above Visalia's whole-year median of 71, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Visalia runs above the national July norm; 71.9% of its July days topped AQI 100 versus 3.6% nationally (above average).
July 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.