Visalia Air Quality in Spring
Across 2019–2025, Visalia's spring (March–May) air quality had a median AQI of 53 (Moderate) over 644 monitored days in the Visalia-Porterville, CA area. 5.9% of spring days (38 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 62.1% of days. The cleanest spring on record here was 2019 (median AQI 52, 0 days above 100) and the worst was 2020 (median 54, 8 days above 100, peak AQI 151).
- Good: 42.5%
- Moderate: 51.6%
- Unhealthy for Sensitive Groups: 5.7%
- Unhealthy or worse: 0.2%
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 spring?
Moderate on a typical day: median AQI 53 across 2019–2025, with 5.9% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓42.5% of spring days were Good (AQI 0–50), 51.6% Moderate (51–100).
- ✓38 days of 644 reached AQI 101+; the spring peak was 151.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Visalia in spring?▾
Across 2019–2025, the median daily AQI in Visalia in spring was 53 (Moderate). 42.5% of days were Good, 51.6% Moderate, and 5.9% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Visalia?▾
A typical spring day in Visalia is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 17 of spring days (5.9%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Visalia's spring air quality problems?▾
Ground-level ozone set the daily AQI on 62.1% of spring days in Visalia. The highest spring AQI recorded in 2019–2025 was 151 (Unhealthy), in 2020.
Visalia spring air quality, year by year
Visalia spring air quality by year (Visalia-Porterville, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 92 | 52 | 0 | 93 | O3 |
| 2020worst | 92 | 54 | 8 | 151 | O3 |
| 2021 | 92 | 58 | 6 | 133 | O3 |
| 2022 | 92 | 56 | 6 | 143 | O3 |
| 2023 | 92 | 49 | 7 | 129 | O3 |
| 2024 | 92 | 50 | 6 | 133 | O3 |
| 2025 | 92 | 52 | 5 | 140 | O3 |
What spring air means in Visalia
A typical spring day in Visalia is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 17 of spring days (5.9%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Spring's median AQI of 53 is below Visalia's whole-year median of 71, making it one of the area's cleaner periods. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Visalia runs above the national Spring norm; 5.9% of its Spring days topped AQI 100 versus 0.8% nationally (above average).
Within the season, March is the cleanest month (median AQI 44, 0.0% of days above 100) and May the worst (median 67, 15.2% 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.