Air Quality in Visalia, California — Live
Live readings from PurpleAir sensors across Visalia — with free alerts the moment the air turns.
AQI 52 from 2 PurpleAir sensors · Trending down · data from PurpleAir
As of , the air quality in Visalia, California is AQI 52 — Moderate and falling — with PM2.5 at 10.0 µg/m³, the median of 2 live PurpleAir sensors reading 49 to 55. Canairy's verdict: Mostly clear.
For scale, that PM2.5 reading is below the World Health Organization's 24-hour guideline of 15 µg/m³. The WHO figure is a daily average and this is a live reading, so read it as a sense of magnitude rather than a formal exceedance — a brief spike and a bad day are not the same thing. More on the WHO guidelines
Pollen today in Visalia: grass pollen is the strongest of the three at a very low level, from Google's pollen forecast. Canairy shows the tree, grass and weed forecast beside the air reading on every plan, including the free one.
Free to download · Live data from PurpleAir & public monitors
Live PurpleAir sensor map for Visalia and Tulare, Exeter, Farmersville, Hanford. Every dot is a real sensor, color-coded by current air quality.
Sensor by sensor in Visalia
The sensors Canairy reads in Visalia are 6 AQI points apart right now, from Good to Moderate, which is the whole reason one city-wide number can mislead you: the median describes air you may not be standing in.
| From city center | AQI | Category |
|---|---|---|
| 0.7 mi W | 55 | Moderate |
| 8.4 mi ESE | 49 | Good |
Visalia's air problem is not mainly a smoke problem, and it is not mainly a winter problem. It is ozone. In the American Lung Association's 2026 State of the Air, using 2022 to 2024 data, the Visalia metro ranked second worst in the entire country for high-ozone days, behind only Los Angeles, with a weighted average of 92.7 unhealthy ozone days a year. Ozone is invisible and has no smell, which is why a bad air day here can look like a perfectly clear afternoon. The particle side is genuinely improving — the same report recorded Visalia's best year-round particle numbers yet — but the ozone ranking has not moved.
What Canairy does for Visalia
A clear verdict
Not just a number — a plain-English call for Visalia: open the windows, or keep them shut.
Smoke alerts
A push or text the moment the air crosses your threshold — and again when it clears.
A heads-up before it's bad
Trend alerts catch the air turning, so you can close up the house before the smoke settles in.
Every place you care about
Home, work, the kids' school — across Visalia or across the country, on one screen.
What the air in Visalia is doing next
| When | AQI | Expected air quality | Main pollutant |
|---|---|---|---|
| Today | 105 | Unhealthy for Sensitive Groups | ozone |
Forecast from EPA AirNow for the Visalia reporting area. Canairy watches the live sensors against it and tells you when the air actually crosses your threshold, rather than leaving you to check.
The worst air often arrives on a clear summer afternoon
This is the part that surprises people. The Valley is designated extreme nonattainment for the federal 8-hour ozone standard — the most severe classification the Clean Air Act has — and Visalia sits near the top of the national list. In the 2026 State of the Air it ranked second in the country for ozone with 92.7 high-ozone days a year, while Fresno, its northern neighbor, ranked fifth with 54.5. Ozone builds through hot sunny afternoons and is not something you will smell or see, so it is worth checking rather than guessing.
On particulate matter Visalia ranked fifth worst nationally for both short-term spikes and year-round levels — but those were its best figures on record. The two pollutants run on different clocks here: ozone peaks in summer heat, fine particles peak in winter stagnation and during fire season.
The fires that matter here are up the 198
State Route 198 runs through Visalia as a freeway, then climbs east past Exeter into the Sierra, ending near the Sequoia National Park boundary at Lake Kaweah. That upper country has burned repeatedly and hard. The SQF Complex burned 174,178 acres in Tulare County in 2020 and killed an estimated 7,500 to 10,600 large giant sequoias. In 2021 the KNP Complex began as two lightning fires on September 9, merged, burned 88,307 acres inside Sequoia National Park, and was not contained until mid-December when atmospheric rivers arrived. The Windy Fire burned 97,528 acres in the same county that autumn, including 1,723 acres of giant sequoia groves.
When those are burning, the Valley Air District issues alerts covering Fresno, Kings, Tulare and Kern counties, and particulate readings on the Valley floor have run in the hazardous range for much of a day — that happened in September 2021 with the KNP Complex and Windy Fire burning at once.
Dairies, orchards, and what changed in 2025
Tulare County produces more milk than any other county in the United States — over 10.5 billion pounds in 2024, from roughly 335 dairies. Dairies are a major ammonia source, and ammonia combines with nitrogen oxides from combustion to form ammonium nitrate, commonly the largest single contributor to Valley PM2.5 in winter. The regulatory response has focused on engines rather than herds for a specific reason: modeling for the Valley found that halving nitrogen oxides cut nitrate by 30 to 50 percent, while halving ammonia changed it by less than 5 percent.
Field burning has changed too. As of January 1, 2025 a near-total ban on agricultural open burning took effect across the Valley. The District may now issue permits only for prunings and orchard removals from apple, pear and quince, plus rice straw capped at 20 percent of a grower's annual acreage. Small orchard removals, vineyard removals and surface-harvested prunings can no longer be burned at all. On the residential side, Check Before You Burn runs November 1 through the end of February under Rule 4901, declared county by county.
Visalia air quality FAQ
What is the air quality in Visalia right now?
As of September 10, 2026 at 5:10 AM PDT, the air quality in Visalia, California is AQI 52 — Moderate — with PM2.5 at 10.0 µg/m³, the median of 2 live PurpleAir sensors. Sensitive groups may want to take it slower outside.
Why is there smoke in Visalia today?
The most common source is a wildfire in the Sierra east of town — Sequoia National Park and the Sequoia National Forest, up the 198 — with smoke settling onto the Valley floor. The Air District has issued smoke alerts covering Tulare County during fires like the KNP Complex and the Windy Fire in 2021. In winter, residential wood smoke on a stagnant night is the more likely culprit. What it is much less likely to be, since January 2025, is a farm field: agricultural open burning is now nearly entirely prohibited in the Valley.
The sky looks clear — why is the AQI high?
Probably ozone. It is invisible and odorless, it forms in sunlight, and it peaks on hot clear afternoons rather than smoky ones. Visalia ranked second worst in the nation for high-ozone days in the American Lung Association's 2026 report, and the Valley is classified extreme nonattainment for the federal 8-hour ozone standard. A clear sky here is not evidence of clean air.
Is farm burning still making the air bad in Visalia?
Much less than it used to. As of January 1, 2025 the Valley Air District may only permit open burning of apple, pear and quince prunings and orchard removals, plus rice straw limited to 20 percent of a grower's annual acreage. Small orchard removals, vineyard removals and surface-harvested prunings are now prohibited. Growers have been shifting to whole-orchard recycling, chipping the wood back into the soil.
What the AQI numbers mean
| AQI | Category | What it means for you |
|---|---|---|
| 0–50 | Good | Open the windows. Great for outdoor activity. |
| 51–100 | Moderate | Sensitive groups may want to take it slower outside. |
| 101–150 | Unhealthy for Sensitive Groups | Kids, elderly, and respiratory conditions stay closer to home. |
| 151–200 | Unhealthy | Skip outdoor exercise. Close windows. |
| 201–300 | Very Unhealthy | Limit time outside. N95 if you must go. |
| 301+ | Hazardous | Health emergency. Stay inside, run filtration if you have it. |
Canairy lets you tighten these bands if you’re more sensitive than the EPA default, so an alert can fire before the official category changes. How to read the Air Quality Index
Where these readings come from
The AQI at the top of this page is the median of the 2 curated PurpleAir sensors Canairy tracks in and around Visalia, with outliers set aside so that one sensor brought indoors — or parked beside a barbecue — cannot set the number for a whole city. Every sensor behind it is listed above with its distance and bearing from the city center. There is no black box here.
In the app, a place you save resolves the same way first. When no neighborhood sensor is reporting it falls back to the nearest EPA AirNow monitor, and anything modeled rather than measured is labelled a regional estimate rather than passed off as a sensor reading. How low-cost sensors compare to regulatory monitors
About Canairy
Canairy is free to download. The free plan covers one saved place with live readings, a plain-English verdict, and push alerts when the air crosses a threshold you choose. Paid plans add more places, faster refreshes, and SMS alerts. It is built by two parents in Sonoma County, California, who got tired of guessing whether it was safe to send the kids outside. Why we built it
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Air quality near Visalia
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