Fresno Air Quality in Spring
Across 2019–2025, Fresno's spring (March–May) air quality had a median AQI of 51 (Moderate) over 644 monitored days in the Fresno, CA area. 4.7% of spring days (30 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 70.2% of days. The cleanest spring on record here was 2024 (median AQI 52, 2 days above 100) and the worst was 2021 (median 55, 6 days above 100, peak AQI 126).
- Good: 49.8%
- Moderate: 45.5%
- Unhealthy for Sensitive Groups: 4.5%
- Unhealthy or worse: 0.2%
Extra Protection for Fresno Homes
Air quality in Fresno is moderate (AQI 69), 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 Fresno in spring?
Moderate on a typical day: median AQI 51 across 2019–2025, with 4.7% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓49.8% of spring days were Good (AQI 0–50), 45.5% Moderate (51–100).
- ✓30 days of 644 reached AQI 101+; the spring peak was 164.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Fresno in spring?▾
Across 2019–2025, the median daily AQI in Fresno in spring was 51 (Moderate). 49.8% of days were Good, 45.5% Moderate, and 4.7% 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 Fresno?▾
A typical spring day in Fresno is Moderate (median AQI 51): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 21 of spring days (4.7%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Fresno's spring air quality problems?▾
Ground-level ozone set the daily AQI on 70.2% of spring days in Fresno. The highest spring AQI recorded in 2019–2025 was 164 (Unhealthy), in 2021.
Fresno spring air quality, year by year
Fresno spring air quality by year (Fresno, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 48 | 3 | 122 | O3 |
| 2020 | 92 | 47 | 5 | 143 | O3 |
| 2021worst | 92 | 55 | 6 | 126 | PM2.5 |
| 2022 | 92 | 54 | 3 | 122 | O3 |
| 2023 | 92 | 48 | 6 | 140 | O3 |
| 2024cleanest | 92 | 52 | 2 | 108 | O3 |
| 2025 | 92 | 50 | 5 | 164 | O3 |
What spring air means in Fresno
A typical spring day in Fresno is Moderate (median AQI 51): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 21 of spring days (4.7%) 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 51 is below Fresno's whole-year median of 67, 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 Fresno runs above the national Spring norm; 4.7% of its Spring days topped AQI 100 versus 0.8% nationally (above average).
Within the season, March is the cleanest month (median AQI 45, 0.0% of days above 100) and May the worst (median 57, 11.1% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Fresno
The latest EPA AirNow observation puts Fresno's AQI at 69 (PM10). The figures above are multi-year season statistics, not today's reading.
View current Fresno air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Fresno, 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.