Fresno air quality
California, United States · Live AQI and hourly forecast for the next 5 days · updated Sat 4:00 PM local time
Moderate
Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.
- Next 24 hours
- 57–62US AQI, highest around Sun 3:00 AM
- Best time outside
- Sun 12:00 PM–3:00 PMUS AQI about 57
- PM2.5 vs WHO guideline
- 0.9×13 µg/m³ over 24 h, guideline 15
- Cigarette equivalent
- ≈ 0.6 a dayBerkeley Earth rule of thumb
- European AQI
- Fairlevel 2 of 6
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Pollutants in Fresno right now
| Pollutant | Now | Next 24 h vs WHO | US AQI band |
|---|---|---|---|
| Fine particles (PM2.5) | 7.5 µg/m³ | 0.9× | Good |
| Coarse particles (PM10) | 14 µg/m³ | 0.5× | Good |
| Nitrogen dioxide (NO2) | 0.4 µg/m³ | 0.4× | Good |
| Ozone (O3) | 98 µg/m³ | 0.7× | Good |
| Sulphur dioxide (SO2) | 0.6 µg/m³ | 0.0× | Good |
| Carbon monoxide (CO) | 126 µg/m³ | 0.0× | Good |
| Desert dust | 10 µg/m³ | ||
| Smoke and haze (aerosol optical depth) | 0.09 | ||
| UV index | 2.1 |
“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.
Next 48 hours
Hourly US AQI. Highest 62 around Sun 3:00 AM, lowest 56 around Mon 4:00 AM.
5-day air quality forecast for Fresno
Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.
| Day | US AQI | At worst | PM2.5 avg | |
|---|---|---|---|---|
| Sat, Sep 26 | 57–64 | 15 | ||
| Sun, Sep 27 | 57–62 | 13 | ||
| Mon, Sep 28 | 56–57 | 13 | ||
| Tue, Sep 29 | 57–62 | 16 | ||
| Wed, Sep 30 | 63–79 | 17 |
Common questions about the air in Fresno
Is the air in Fresno safe today?
For most people, yes. Right now the US AQI in Fresno is 58, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.
When is the best time to be outside in Fresno?
Sun 12:00 PM–3:00 PM. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 57. The worst hour is around Sun 3:00 AM, at 62.
What is the main pollutant in Fresno?
Ozone (O3). It drives the index right now, at 98 µg/m³. Formed by sunlight acting on traffic and plant emissions. Highest on hot, still afternoons, often downwind of cities.
How does Fresno's air compare with the WHO guideline?
Within the guideline. Over the next 24 hours PM2.5 averages about 13 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.
How many cigarettes is a day of Fresno's air?
About 0.6 cigarettes. Over the next 24 hours PM2.5 averages about 13 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Fresno improve this week?
Monday looks cleanest. Its AQI peaks at 57, against 79 on Wednesday, the worst day in the forecast.
Measured near Fresno
| Station | PM2.5 µg/m³ | Measured |
|---|---|---|
| Fresno-Foundry Park AirNow, reference monitor | 15 | Sat 3:00 PM |
| Fresno-Pacific AirNow, reference monitor | 11 | Sat 3:00 PM |
| Fresno - Drummond Street AirNow, reference monitor | – | Sat 3:00 PM |
Air quality near Fresno
- Sacramento 254 km NW
- San Francisco 260 km NW
- Los Angeles 330 km SE
- Las Vegas 420 km E
- San Diego 507 km SE
- Phoenix 791 km SE
About this forecast
Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 36.74°N, 119.79°W, updated 2026-09-26 23:00 UTC.