Worst air pollution Fresno, today and tomorrow
Today (15 July): Air quality in Fresno is poor. AQI and O3 are poor; NO2 is fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 60.3/100).
Tomorrow (16 July 2026): Air quality in Fresno is medium. AQI improves to medium; NO2 decreases to good; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 44.2/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Fresno's air quality is among the worst in the US, positioned in the San Joaquin Valley's notorious air quality trap where the Sierra Nevada to the east and the Coast Ranges to the west create an enclosed basin that traps vehicle, agricultural, and dairy farming emissions under persistent winter tule fog inversions. Summer ozone from agricultural burning and vehicle emissions adds a severe warm-season dimension.
Today - 15 July | Pollution peaks at 09:00
AQI:
Poor
60.3/100
PM2.5 (fine particles):
Good
18.0/100
PM10 (coarse particles):
Good
9.6/100
NO2 (nitrogen dioxide):
Fair
20.5/100
O3 (ozone):
Poor
60.3/100
SO2 (sulfur dioxide):
Good
4.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.2/100
PM1 (ultrafine particles):
Good
12.3/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Medium
44.2/100
PM2.5 (fine particles):
Good
19.0/100
PM10 (coarse particles):
Good
9.6/100
NO2 (nitrogen dioxide):
Good
19.8/100
O3 (ozone):
Medium
44.2/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.5/100
PM1 (ultrafine particles):
Good
13.0/100
Pollen forecast in Fresno
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Fresno
Frequently Asked Questions
Is air quality bad in Fresno right now?
On 15 July 2026, overall air quality in Fresno is poor. AQI is the main air quality indicator at 60.3/100. Pollution peaks around 9:00 AM (O3: 60.3/100).
Will air quality be worse tomorrow in Fresno?
On 16 July 2026, air quality conditions in Fresno will be better than today, with AQI forecast at medium at 44.2/100. Pollution peaks around 9:00 AM (O3: 44.2/100).
When is air pollution at its worst in Fresno?
Fresno follows a fairly predictable seasonal air quality pattern, as the rainy winter months generally bring the cleanest air, as storms clear traffic and woodsmoke pollution; by contrast, summer and early autumn bring the highest risk, with heat-driven ozone and wildfire smoke both peaking from July through October. Dry summer conditions with virtually no rain mean pollution and smoke can linger for extended stretches once they arrive.
Are air quality levels in Fresno based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Want to see air quality forecasts for other cities in United States?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app