Fresno Air Quality in 2019
In 2019, Fresno's air quality (Fresno, CA area) had a median daily AQI of 63 (Moderate) across 365 monitored days. 66 days (18.1%) reached Unhealthy for Sensitive Groups or worse, 113 were Good, and the year's peak AQI was 187 (Unhealthy). Ground-level ozone set the daily AQI on 229 of those days. The cleanest month of 2019 was March (median AQI 44, 0 days above 100) and the worst was August (median 100, 14 days above 100, peak 169).
- Good: 31.0%
- Moderate: 51.0%
- Unhealthy for Sensitive Groups: 17.5%
- Unhealthy or worse: 0.5%
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How was Fresno's air quality in 2019?
Moderate on a typical day: median AQI 63, with 66 days above AQI 100 out of 365 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 187 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 229 days.
- ✓Cleanest month: March; worst: August.
Frequently asked questions
What was the average AQI in Fresno in 2019?▾
EPA's Air Quality System puts Fresno's (Fresno, CA) median daily AQI for 2019 at 63, which is Moderate. 66 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 187.
Which month had the worst air quality in Fresno in 2019?▾
The cleanest month of 2019 was March (median AQI 44, 0 days above 100) and the worst was August (median 100, 14 days above 100, peak 169).
Was 2019 a good or bad year for Fresno's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 3rd cleanest by days above AQI 100. 2019's median of 63 is below the area's typical annual median of 67.
Fresno month by month in 2019
Fresno air quality month by month, 2019 (Fresno, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 64 | 8 | 140 | PM2.5 |
| February | 28 | 52 | 0 | 78 | PM2.5 |
| Marchcleanest | 31 | 44 | 0 | 58 | O3 |
| April | 30 | 50 | 1 | 122 | O3 |
| May | 31 | 51 | 2 | 105 | O3 |
| June | 30 | 87 | 12 | 133 | O3 |
| July | 31 | 87 | 7 | 133 | O3 |
| Augustworst | 31 | 100 | 14 | 169 | O3 |
| September | 30 | 77 | 10 | 147 | O3 |
| October | 31 | 83 | 6 | 187 | O3 |
| November | 30 | 88 | 4 | 140 | PM2.5 |
| December | 31 | 60 | 2 | 112 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 3rd cleanest by days above AQI 100.
2019's median of 63 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.