Visalia Air Quality in Summer
Across 2019–2025, Visalia's summer (June–August) air quality had a median AQI of 108 (Unhealthy for Sensitive Groups) over 644 monitored days in the Visalia-Porterville, CA area. 59.8% of summer days (385 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 94.1% of days. The cleanest summer on record here was 2025 (median AQI 90, 31 days above 100) and the worst was 2021 (median 125, 69 days above 100, peak AQI 187).
- Good: 4.3%
- Moderate: 35.9%
- Unhealthy for Sensitive Groups: 50.0%
- Unhealthy or worse: 9.8%
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 summer?
Unhealthy for Sensitive Groups on a typical day: median AQI 108 across 2019–2025, with 59.8% of summer days above AQI 100. Ground-level ozone is the main driver.
- ✓4.3% of summer days were Good (AQI 0–50), 35.9% Moderate (51–100).
- ✓385 days of 644 reached AQI 101+; the summer peak was 225.
- ✓Cleanest month: June; worst month: July.
Frequently asked questions
What is the air quality like in Visalia in summer?▾
Across 2019–2025, the median daily AQI in Visalia in summer was 108 (Unhealthy for Sensitive Groups). 4.3% of days were Good, 35.9% Moderate, and 59.8% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is summer a good time for outdoor exercise in Visalia?▾
A typical summer day in Visalia is already Unhealthy for Sensitive Groups (median AQI 108): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 60% of summer days (59.8%) were at that level or worse.
Which pollutant causes Visalia's summer air quality problems?▾
Ground-level ozone set the daily AQI on 94.1% of summer days in Visalia. The highest summer AQI recorded in 2019–2025 was 225 (Very Unhealthy), in 2021.
Visalia summer air quality, year by year
Visalia summer air quality by year (Visalia-Porterville, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 101 | 50 | 150 | O3 |
| 2020 | 92 | 115 | 65 | 225 | O3 |
| 2021worst | 92 | 125 | 69 | 187 | O3 |
| 2022 | 92 | 115 | 58 | 172 | O3 |
| 2023 | 92 | 101 | 46 | 159 | O3 |
| 2024 | 92 | 128 | 66 | 185 | O3 |
| 2025cleanest | 92 | 90 | 31 | 147 | O3 |
What summer air means in Visalia
A typical summer day in Visalia is already Unhealthy for Sensitive Groups (median AQI 108): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 60% of summer days (59.8%) were at that level or worse.
Summer's median AQI of 108 is above Visalia's whole-year median of 71, making it one of the area's dirtier periods. Nationally, the median Summer AQI across every EPA metro area (308,645 metro-days, 2019–2025) is 46, so Visalia runs above the national Summer norm; 59.8% of its Summer days topped AQI 100 versus 3.6% nationally (above average).
Within the season, June is the cleanest month (median AQI 93, 42.4% of days above 100) and July the worst (median 119, 71.9% above 100).
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 season 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.