Fresno Air Quality in Summer
Across 2019–2025, Fresno's summer (June–August) air quality had a median AQI of 87 (Moderate) over 644 monitored days in the Fresno, CA area. 31.2% of summer days (201 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 86.5% of days. The cleanest summer on record here was 2025 (median AQI 77, 15 days above 100) and the worst was 2024 (median 99, 42 days above 100, peak AQI 169).
- Good: 10.2%
- Moderate: 58.5%
- Unhealthy for Sensitive Groups: 26.1%
- Unhealthy or worse: 5.1%
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 summer?
Moderate on a typical day: median AQI 87 across 2019–2025, with 31.2% of summer days above AQI 100. Ground-level ozone is the main driver.
- ✓10.2% of summer days were Good (AQI 0–50), 58.5% Moderate (51–100).
- ✓201 days of 644 reached AQI 101+; the summer peak was 254.
- ✓Cleanest month: June; worst month: August.
Frequently asked questions
What is the air quality like in Fresno in summer?▾
Across 2019–2025, the median daily AQI in Fresno in summer was 87 (Moderate). 10.2% of days were Good, 58.5% Moderate, and 31.2% 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 Fresno?▾
A typical summer day in Fresno is Moderate (median AQI 87): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of summer days (31.2%) 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 summer air quality problems?▾
Ground-level ozone set the daily AQI on 86.5% of summer days in Fresno. The highest summer AQI recorded in 2019–2025 was 254 (Very Unhealthy), in 2024.
Fresno summer air quality, year by year
Fresno summer air quality by year (Fresno, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 92 | 33 | 169 | O3 |
| 2020 | 92 | 90 | 31 | 254 | O3 |
| 2021 | 92 | 90 | 31 | 187 | O3 |
| 2022 | 92 | 80 | 22 | 159 | O3 |
| 2023 | 92 | 84 | 27 | 156 | O3 |
| 2024worst | 92 | 99 | 42 | 169 | O3 |
| 2025cleanest | 92 | 77 | 15 | 156 | O3 |
What summer air means in Fresno
A typical summer day in Fresno is Moderate (median AQI 87): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of summer days (31.2%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Summer's median AQI of 87 is above Fresno's whole-year median of 67, 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 Fresno runs above the national Summer norm; 31.2% of its Summer days topped AQI 100 versus 3.6% nationally (above average).
Within the season, June is the cleanest month (median AQI 71, 20.5% of days above 100) and August the worst (median 93, 40.6% 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.