Visalia Air Quality in January
Across 2019–2025, Visalia's January air quality had a median AQI of 67 (Moderate) over 217 monitored days in the Visalia-Porterville, CA area. 12.9% of January days (28 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 90.3% of days. The cleanest January on record here was 2023 (median AQI 47, 0 days above 100) and the worst was 2022 (median 82, 10 days above 100, peak AQI 158).
- Good: 17.5%
- Moderate: 69.6%
- Unhealthy for Sensitive Groups: 12.4%
- Unhealthy or worse: 0.5%
Extra Protection for Visalia Homes
Air quality in Visalia is moderate (AQI 66), with fine particles (PM2.5) 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 is the air in Visalia in January?
Moderate on a typical day: median AQI 67 across 2019–2025, with 12.9% of January days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓17.5% of January days were Good (AQI 0–50), 69.6% Moderate (51–100).
- ✓28 days of 217 reached AQI 101+; the January peak was 158.
- ✓Best January: 2023; worst January: 2022.
Frequently asked questions
What is the air quality like in Visalia in January?▾
Across 2019–2025, the median daily AQI in Visalia in January was 67 (Moderate). 17.5% of days were Good, 69.6% Moderate, and 12.9% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is January a good time for outdoor exercise in Visalia?▾
A typical January day in Visalia is Moderate (median AQI 67): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 8 of January days (12.9%) 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 January air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 90.3% of January days in Visalia. The highest January AQI recorded in 2019–2025 was 158 (Unhealthy), in 2022.
Visalia January air quality, year by year
Visalia January 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 | 61 | 6 | 138 | PM2.5 |
| 2020 | 31 | 69 | 1 | 111 | PM2.5 |
| 2021 | 31 | 76 | 9 | 124 | PM2.5 |
| 2022worst | 31 | 82 | 10 | 158 | PM2.5 |
| 2023cleanest | 31 | 47 | 0 | 100 | PM2.5 |
| 2024 | 31 | 57 | 1 | 110 | PM2.5 |
| 2025 | 31 | 69 | 1 | 104 | PM2.5 |
What January air means in Visalia
A typical January day in Visalia is Moderate (median AQI 67): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 8 of January days (12.9%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
January's median AQI of 67 is below Visalia's whole-year median of 71, making it one of the area's cleaner periods. Nationally, the median January AQI across every EPA metro area (95,602 metro-days, 2019–2025) is 39, so Visalia runs above the national January norm; 12.9% of its January days topped AQI 100 versus 0.7% nationally (above average).
January is part of Visalia's winter season (December, January, February); the winter 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 66 (PM2.5). 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.