Fresno Air Quality in 2023
In 2023, Fresno's air quality (Fresno, CA area) had a median daily AQI of 64 (Moderate) across 365 monitored days. 58 days (15.9%) reached Unhealthy for Sensitive Groups or worse, 97 were Good, and the year's peak AQI was 156 (Unhealthy). Ground-level ozone set the daily AQI on 208 of those days. The cleanest month of 2023 was March (median AQI 43, 0 days above 100) and the worst was July (median 101, 16 days above 100, peak 156).
- Good: 26.6%
- Moderate: 57.5%
- Unhealthy for Sensitive Groups: 15.1%
- Unhealthy or worse: 0.8%
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How was Fresno's air quality in 2023?
Moderate on a typical day: median AQI 64, with 58 days above AQI 100 out of 365 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 156 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 208 days.
- ✓Cleanest month: March; worst: July.
Frequently asked questions
What was the average AQI in Fresno in 2023?▾
EPA's Air Quality System puts Fresno's (Fresno, CA) median daily AQI for 2023 at 64, which is Moderate. 58 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 156.
Which month had the worst air quality in Fresno in 2023?▾
The cleanest month of 2023 was March (median AQI 43, 0 days above 100) and the worst was July (median 101, 16 days above 100, peak 156).
Was 2023 a good or bad year for Fresno's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 2nd cleanest by days above AQI 100. 2023's median of 64 is below the area's typical annual median of 67.
Fresno month by month in 2023
Fresno air quality month by month, 2023 (Fresno, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 53 | 1 | 103 | PM2.5 |
| February | 28 | 59 | 0 | 89 | PM2.5 |
| Marchcleanest | 31 | 43 | 0 | 64 | O3 |
| April | 30 | 50 | 3 | 140 | O3 |
| May | 31 | 54 | 3 | 126 | O3 |
| June | 30 | 61 | 2 | 143 | O3 |
| Julyworst | 31 | 101 | 16 | 156 | O3 |
| August | 31 | 84 | 9 | 129 | O3 |
| September | 30 | 74 | 6 | 140 | O3 |
| October | 31 | 68 | 5 | 136 | PM2.5 |
| November | 30 | 73 | 3 | 122 | PM2.5 |
| December | 31 | 83 | 10 | 140 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 2nd cleanest by days above AQI 100.
2023's median of 64 is below the area's typical annual median of 67.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Fresno
The latest EPA AirNow observation puts Fresno's AQI at 49 (PM2.5). The figures above are multi-year annual 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.