Fresno Air Quality in August
Across 2019–2025, Fresno's August air quality had a median AQI of 93 (Moderate) over 217 monitored days in the Fresno, CA area. 40.6% of August days (88 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 81.1% of days. The cleanest August on record here was 2023 (median AQI 84, 9 days above 100) and the worst was 2020 (median 108, 18 days above 100, peak AQI 254).
- Good: 5.5%
- Moderate: 53.9%
- Unhealthy for Sensitive Groups: 31.8%
- Unhealthy or worse: 8.8%
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 August?
Moderate on a typical day: median AQI 93 across 2019–2025, with 40.6% of August days above AQI 100. Ground-level ozone is the main driver.
- ✓5.5% of August days were Good (AQI 0–50), 53.9% Moderate (51–100).
- ✓88 days of 217 reached AQI 101+; the August peak was 254.
- ✓Best August: 2023; worst August: 2020.
Frequently asked questions
What is the air quality like in Fresno in August?▾
Across 2019–2025, the median daily AQI in Fresno in August was 93 (Moderate). 5.5% of days were Good, 53.9% Moderate, and 40.6% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is August a good time for outdoor exercise in Fresno?▾
A typical August day in Fresno is Moderate (median AQI 93): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 2 of August days (40.6%) 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 August air quality problems?▾
Ground-level ozone set the daily AQI on 81.1% of August days in Fresno. The highest August AQI recorded in 2019–2025 was 254 (Very Unhealthy), in 2020.
Fresno August air quality, year by year
Fresno August air quality by year (Fresno, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 100 | 14 | 169 | O3 |
| 2020worst | 31 | 108 | 18 | 254 | O3 |
| 2021 | 31 | 105 | 16 | 187 | O3 |
| 2022 | 31 | 87 | 9 | 159 | O3 |
| 2023cleanest | 31 | 84 | 9 | 129 | O3 |
| 2024 | 31 | 77 | 12 | 156 | O3 |
| 2025 | 31 | 84 | 10 | 156 | O3 |
What August air means in Fresno
A typical August day in Fresno is Moderate (median AQI 93): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 2 of August days (40.6%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
August's median AQI of 93 is above Fresno's whole-year median of 67, making it one of the area's dirtier periods. Nationally, the median August AQI across every EPA metro area (104,152 metro-days, 2019–2025) is 45, so Fresno runs above the national August norm; 40.6% of its August days topped AQI 100 versus 3.5% nationally (above average).
August is part of Fresno's summer season (June, July, August); the summer page pools all three months.
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 month 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.